Race/ethnicity: who is counting what?

Misclassification of race and ethnicity in administrative data may produce misleading results if it is overlooked or ignored. In this study, we examined the racial/ethnic classifications of 1,084 veterans with stroke in Florida who received inpatient and outpatient services within the Department of Veterans Affairs (VA) healthcare system and who were also eligible for Medicare between 2000 and 2001. We compared the reliability of racial/ethnic classifications between VA inpatient data, VA outpatient data, and Medicare data. Our results showed that (1) the rate of unknown racial/ethnic classification in VA outpatient and inpatient data was high, (2) minimizing the unknowns by substituting known values from other data when available would greatly enhance the overall and individual classification reliability, (3) black and white classifications in the VA data had stronger agreement with Medicare data, and (4) Medicare data may under-represent Hispanic patients.     

What can Medicaid data add to research on VA patients?

This article is the first to describe Department of Veterans Affairs (VA) patients' use of Medicaid at a national level. We obtained 1999 national VA enrollment and utilization data, Centers for Medicare and Medicaid Services enrollment and claims, and Medicare information from the VA Information Resource Center. The research team created files for program characteristics and described the VA-Medicaid dually enrolled population, healthcare utilization, and costs. In 1999, VA-Medicaid dual enrollees comprised 10.2% of VA's annual patient load (350,000/3,450,000); 304,000 were veterans. These veterans differed marginally from VA's veteran patients, being on average half a year younger and having 1% fewer males. Dual enrollees with mental health diagnoses and care were almost three times as numerous as long-term care patients; these two groups accounted for ~60% of dual enrollees. Dual enrollees disproportionately included housebound veterans and veterans needing aid and assistance. Half the dual enrollees had 12 months of Medicaid eligibility, and total Federal expenditures per patient not in managed care programs averaged >$18,000 (median >$6,000). Dually enrolled women veterans cost ~55% less than men. Medicaid benefits complement VA and are more accessible in many states. VA researchers need to consider including Medicaid utilization and costs in their studies if they target populations or programs related to long-term care or mental disorders.     

Increasing use of Medicare services by veterans with acute myocardial infarction.

OBJECTIVES: Some of the nation's 26 million veterans have two government-financed health care entitlements: Medicare and the Department of Veterans Affairs (VA). The aims of this investigation were to examine trends where Medicare-eligible VA users are initially hospitalized for acute myocardial infarction (AMI) and then to assess rates of cardiac procedure use and mortality for veterans initially admitted to each system of care. METHODS: We used VA and HCFA national databases to identify VA users (age range, > or = 65 years) who were initially admitted to a VAMC or Medicare financed hospital (Medicare hospital) with a primary diagnosis of AMI between January 1, 1992, and December 31, 1995, (n = 47,598). We examined the use of cardiac procedures (cardiac catheterization [CC], coronary artery bypass surgery [CABG], and coronary angioplasty [CA] and mortality (30-day and 1-year) by the type of initial admitting hospital within each system of care. RESULTS: Almost 70% of VA users hospitalized for AMI were initially admitted to Medicare hospitals versus VAMCs between 1992 (64%) and 1995 (72%). After adjusting for patient characteristics in logistic models, VA users initially hospitalized in Medicare hospitals were significantly more likely to undergo cardiac procedures than were VA users hospitalized in VAMCs. Differences in the odds of receiving a procedure were most significant when comparing Medicare hospitals with on-site cardiac technology to VA hospitals without on-site cardiac technology (CC: OR 4.34, 95% CI 3.98-4.73; CABG: OR 2.16, 95% CI 1.92-2.43; CA: OR 4.56, 95% CI 3.98-5.25). We found no significant differences in 30-day and 1-year adjusted mortality rates between VA users initially admitted to VAMCs or Medicare hospitals. CONCLUSIONS: Medicare-eligible VA users are increasingly hospitalized in Medicare hospitals for AMI. VA users cared for in Medicare hospitals receive more cardiac procedures but have the same survival as VA users cared for in VAMCs. These findings have policy implications for access, quality, and costs in both systems of care.     

External validation of medicare claims for breast cancer chemotherapy compared with medical chart reviews

BACKGROUND: Although Medicare claims data have been increasingly used to examine the patterns and outcomes of cancer chemotherapy, their external validity has not been well studied. OBJECTIVES: We sought to validate Medicare claims for chemotherapy compared with medical chart reviews. PATIENTS AND METHODS: We completed medical chart reviews for 1228 women who were diagnosed with breast cancer at age 65 and older between 1993 and 1999 in New Mexico that were linked with Medicare claims data, achieving an estimated sensitivity of more than 90% and a 0.05 level of precision. RESULTS: Of the 150 subjects identified by Medicare claims as receiving chemotherapy within 6 months of diagnosis, 75% were confirmed by medical records as having received chemotherapy. Of the remaining 25% of cases without chart verification, (1) 33 cases had 7 or more claims for chemotherapy and also had specific chemotherapy drugs indicated in Medicare data, representing 22% (33/150) of all cases that received chemotherapy according to Medicare claims and (2) 4 cases had 1 to 6 claims for chemotherapy, representing 3% (4/150) of all cases with claims for chemotherapy. Of those 1078 subjects who did not receive chemotherapy according to Medicare claims, more than 99% were confirmed by chart reviews. Observed agreement on chemotherapy between Medicare claims and chart reviews was 94% and overall reliability (kappa) was 0.69 (95% confidence interval = 0.63-0.76). CONCLUSIONS: Of cases identified as receiving chemotherapy by Medicare claims, 97% had strong evidence and only 3% had weak evidence for receiving this therapy.     

Using VA data for research in persons with spinal cord injuries and disorders: lessons from SCI QUERI

The Department of Veterans Affairs (VA) provides integrated services to more than 25,000 veterans with spinal cord injuries and disorders (SCI/D). VA data offer great potential for providing insights into healthcare utilization and morbidity, and these capabilities are central to efforts to improve healthcare for veterans with SCI/D. The objective of this article is to introduce researchers to the use of VA data to examine questions related to SCI/D using examples from Spinal Cord Injury (SCI) Quality Enhancement Research Initiative studies. Sources of VA data available to investigators interested in SCI/D-related research include national-level VA administrative and clinical databases and primary data (medical record review, patient surveys). Methods used to identify veterans with SCI/D include the Allocation Resource Center cohort, the Spinal Cord Dysfunction (SCD) Registry, and the VA inpatient SCI flag; only 33% of veterans were included in all three groups (n = 12,306). While neurological level of SCI was unknown for approximately a third of veterans (from SCD Registry data alone), the percent decreased to 13% when augmented with diagnostic codes. Primary data can be used to augment other missing SCI data and to provide more detailed information about complications commonly associated with SCI/D.     

Effect of using information from only one system for dually eligible health care users

OBJECTIVE: We sought to determine whether all diagnoses and total illness burden of patients who use both the VA and Medicare health care systems can be obtained from examination of data from only one of these systems. METHODS: Cohorts included all age-eligible Medicare users who also used the VA health care system in fiscal years 2000-2002 but were not enrolled in a Medicare HMO. Relative risk scores (RRS; a measure of illness burden developed by DxCG, Inc., Boston, MA) were calculated using VA, Medicare, and all diagnoses from both VA and Medicare data sources. The relationship between RRS and reliance on Medicare versus the VA system also was explored. We explored whether differences in VA and Medicare RRS were caused by veterans who mainly used pharmacy services or by an underweighting in the RRS calculation of mental health diagnoses. Finally, we explored the relationship between inpatient utilization and RRS in each system. RESULTS: On average for a given patient who used both VA and Medicare services, more diagnoses were recorded in Medicare ( approximately 13-15) than in the VA system ( approximately 8) for dual users. On average only 2 diagnoses were common to both the VA and Medicare. Medicare data alone accounted for approximately 80% of individuals' total illness burden, and VA data alone lead to RRSs that capture one-third of the total illness burden. The ratio of RRS when calculated using Medicare and VA separately was approximately 2.4. RRS was only weakly to moderately correlated with inpatient utilization in each system. CONCLUSION: Using data from just Medicare or VA data sources when conducting research on dually eligible veterans may seriously underestimate total illness burden of the population and also may lead to an underidentification of individuals in a particular disease class.     

Studying outcomes and hospital utilization in the elderly. The advantages of a merged data base for Medicare and Veterans Affairs hospitals.

That veterans aged 65 years and older are eligible to receive care either in the Veteran Affairs (VA) health care system or in the private sector under Medicare confounds the analysis of veterans' health services utilization and outcomes in two ways. First, changes in eligibility or financial barriers to access with regard to either system influence veterans' decisions about where to seek needed care. Second, analyses of VA care for elderly veterans that rely solely on VA data sources underestimate both overall utilization and treatment complications. Similarly, failure to consider the contribution of health care delivery in the VA system may confound analyses of health care utilization by the Medicare-eligible population. To study the magnitude of such confounding influences, we linked the Medicare and VA health care administrative databases for residents of New England and New York. Results indicated that, for ten surgical procedures commonly performed in the elderly, as well as for hospitalizations resulting from acute myocardial infarction and hip fracture, VA patients receive from 17.6% to 37.4% of hospital care outside the VA system. Private hospitalizations account for 5.5% to 19.5% of the care received by veterans within 6 months after an initial episode of care in a VA hospital. It was also found that initial hospitalizations for study conditions in the VA accounted for 3.6% of all such hospitalizations among elderly Medicare-eligible men. Although overall hospital utilization appears to be underestimated in VA data sources, it was found that ascertaining mortality from sources available within the VA produced excellent results when compared with deaths recorded in the Medicare enrollment files. A national, merged VA-Medicare data base is feasible and would enhance the validity of analyses of health care delivery both for elderly veterans and for the Medicare population.     

Department of Veterans Affairs-Medicare dual beneficiaries with stroke: where do they get care?

This study examined care patterns among stroke patients with diabetes who were dually eligible for Department of Veterans Affairs (VA) and Medicare services. We investigated the location (VA hospital or community-based hospital reimbursed by Medicare) of initial and postacute stroke care during a 1-year follow-up period. We used logistic regression to identify the factors associated with the locations of initial and subsequent stroke care. Of the 6,699 patients studied, 76% received their initial care at a Medicare-reimbursed hospital ("Medicare-first" patients) and 24% at a VA hospital ("VA-first" patients). Patients who were white, married, female, or living farther from the VA were more likely to be Medicare-first patients. During the follow-up period, Medicare-first patients were more likely not only to seek further care but also to use the dual systems than were VA-first patients (71% vs 49%, respectively). The high rates of dual-system use highlight the need for care coordination across systems to address issues of care duplication and continuity.     

Use of Medicare and DOD data for improving VA race data quality

We evaluated the improvement in Department of Veterans Affairs (VA) race data completeness that could be achieved by linking VA data with data from Medicare and the Department of Defense (DOD) and examined agreement in values across the data sources. After linking VA with Medicare and DOD records for a 10% sample of VA patients, we calculated the percentage for which race could be identified in those sources. To evaluate race agreement, we calculated sensitivities, specificities, positive predictive values (PPVs), negative predictive values, and kappa statistics. Adding Medicare (and DOD) data improved race data completeness from 48% to 76%. Among older patients (≥65 years), adding Medicare data improved data completeness to nearly 100%. Among younger patients (<65 years), combining Medicare and DOD data improved completeness to 75%, 18 percentage points beyond that achieved with Medicare data alone. PPVs for white and African-American categories were 98.6 and 94.7, respectively, in Medicare and 97.0 and 96.5, respectively, in DOD data using VA self-reported race as the gold standard. PPVs for the non-African-American minority groups were lower, ranging from 30.5 to 48.2. Kappa statistics reflected these patterns. Supplementing VA with Medicare and DOD data improves VA race data completeness substantially. More study is needed to understand poor rates of agreement between VA and external sources in identifying non-African-American minority individuals.     

Is lower 30-day mortality posthospital admission among blacks unique to the Veterans Affairs health care system?

BACKGROUND: Several studies have reported lower risk-adjusted mortality for blacks than whites within the Veterans Affairs (VA) health care system, particularly for those age 65 and older. This finding may be a result of the VA's integrated health care system, which reduces barriers to care through subsidized comprehensive health care services. However, no studies have directly compared racial differences in mortality within 30 days of hospitalization between the VA and non-VA facilities in the US health care system. OBJECTIVE: To compare risk-adjusted 30-day mortality for black and white males after hospital admission to VA and non-VA hospitals, with separate comparisons for patients younger than age 65 and those age 65 and older. RESEARCH DESIGN: Retrospective observational study using hospital claims data from the national VA system and all non-VA hospitals in Pennsylvania and California. SUBJECTS: A total of 369,155 VA and 1,509,891 non-VA hospitalizations for a principal diagnosis of pneumonia, congestive heart failure, gastrointestinal bleeding, hip fracture, stroke, or acute myocardial infarction between 1996 and 2001. MEASURES: Mortality within 30 days of hospital admission. RESULTS: Among those under age 65, blacks in VA and non-VA hospitals had similar odds ratios of 30-day mortality relative to whites for gastrointestinal bleeding, hip fracture, stroke, and acute myocardial infarction. Among those age 65 and older, blacks in both VA and non-VA hospitals had significantly reduced odds of 30-day mortality compared with whites for all conditions except pneumonia in the VA. The differences in mortality by race are remarkably similar in VA and non-VA settings. CONCLUSIONS: These findings suggest that factors associated with better short-term outcomes for blacks are not unique to the VA.     

Suicide After Stroke in the United States Veteran Health Administration Population

ObjectiveTo evaluate risk for suicide among veterans with a history of stroke, seeking care within the Veterans Health Administration (VHA), we analyzed existing clinical data.DesignThis retrospective cohort study was approved and performed in accordance with the local Institutional Review Board. Veterans were identified via the VHA's Corporate Data Warehouse. Initial eligibility criteria included confirmed veteran status and at least 90 days of VHA utilization between fiscal years 2001-2015. Cox proportional hazards models were used to assess the association between history of stroke and suicide. Among those veterans who died by suicide, the association between history of stroke and method of suicide was also investigated.SettingVHA.ParticipantsVeterans with at least 90 days of VHA utilization between fiscal years 2001-2015 (N=1,647,671). Data from these 1,647,671 veterans were analyzed (1,405,762 without stroke and 241,909 with stroke).InterventionsNot applicable.Main Outcome MeasuresSuicide and method of suicide.ResultsThe fully adjusted model, which controlled for age, sex, mental health diagnoses, mild traumatic brain injury, and modified Charlson/Deyo Index (stroke-related diagnoses excluded), demonstrated a hazard ratio of 1.13 (95% confidence interval, 1.02-1.25; P=.02). The majority of suicides in both cohorts was by firearm, and a significantly larger proportion of suicides occurred by firearm in the group with stroke than the cohort without (81.2% vs 76.6%).ConclusionsFindings suggest that veterans with a history of stroke are at increased risk for suicide, specifically by firearm, compared with veterans without a history of stroke. Increased efforts are needed to address the mental health needs and lethal means safety of veterans with a history of stroke, with the goal of improving function and decreasing negative psychiatric outcomes, such as suicide.     

Differences in cause of death of Washington State veterans who did and did not use Department of Veterans Affairs healthcare services

Relatively little is known about the cause of death in the veteran population, although more is known about the cause of death in Vietnam veterans or veterans receiving mental health services. This article compares characteristics and causes of death in Washington State veterans who did and did not use Department of Veterans Affairs (VA) healthcare services in the 5 years prior to death. This study included 62,080 veterans who died between 1998 and 2002, of whom 21% were users of VA healthcare services. The veterans who used VA healthcare services were younger, more often men, less educated, more often divorced, and more often smokers than the veterans who did not use VA healthcare services. Both female and male veterans who used VA healthcare services were more likely to die from drug- and/or alcohol-related causes. These findings suggest that the VA patient population is socially disadvantaged and more severely affected by substance-use disorders compared with veterans who do not use VA healthcare services.     

Creating a sampling frame for population-based veteran research: representativeness and overlap of VA and Department of Defense databases

Most veteran research is conducted in Department of Veterans Affairs (VA) healthcare settings, although most veterans obtain healthcare outside the VA. Our objective was to determine the adequacy and relative contributions of Veterans Health Administration (VHA), Veterans Benefits Administration (VBA), and Department of Defense (DOD) administrative databases for representing the U.S. veteran population, using as an example the creation of a sampling frame for the National Survey of Women Veterans. In 2008, we merged the VHA, VBA, and DOD databases. We identified the number of unique records both overall and from each database. The combined databases yielded 925,946 unique records, representing 51% of the 1,802,000 U.S. women veteran population. The DOD database included 30% of the population (with 8% overlap with other databases). The VHA enrollment database contributed an additional 20% unique women veterans (with 6% overlap with VBA databases). VBA databases contributed an additional 2% unique women veterans (beyond 10% overlap with other databases). Use of VBA and DOD databases substantially expands access to the population of veterans beyond those in VHA databases, regardless of VA use. Adoption of these additional databases would enhance the value and generalizability of a wide range of studies of both male and female veterans.     

Honoring Veterans' Preferences: The Association Between Comfort Care Goals and Care Received at the End of Life

ContextAs part of its Life-Sustaining Treatment (LST) Decisions Initiative, the Veterans Health Administration (VA) in January 2017 began requiring electronic documentation of goals of care and preferences for Veterans with serious illness and at high risk for life-threatening events.ObjectivesTo evaluate whether goals of “to be comfortable” were associated with greater palliative care (PC) use and lesser acute care use.MethodsWe identified Veterans with VA inpatient or nursing home stays overlapping July 2018–January 2019, with LST templates documented by January 31, 2019, and who died by April 30, 2019 (N = 18,163). From template documentation, we identified a “to be comfortable” goal. Using VA and Medicare data, we determined PC use (consultations and hospice) and hospital, intensive care unit, and emergency department use 7 and 30 days before death. Multivariate logistic regression examined the associations of interest.ResultsSixty-four percent of the 18,163 Veterans had comfort-care goals; 80% with comfort care goals received hospice and 57% PC consultations (versus 57% and 46%, respectively, for decedents without comfort-care goals). In adjusted analyses, comfort care documented on the LST template prior to death was associated with significantly lower odds of hospital, intensive care unit, and emergency department use near the end of life. In the last 30 days of life, Veterans with a comfort care goal had 44% lower odds (adjusted odds ratio 0.57; 95% CI: 0.51, 0.63) of being hospitalized.ConclusionFindings support the VA's commitment to honoring of Veterans' preferences post introduction of its Life Sustaining Treatment Decisions Initiative.     

Who pays when VA users are hospitalized in the private sector? Evidence from three data sources

BACKGROUND: Older veterans enrolled in VA healthcare receive much of their medical care in the private sector, through Medicare. Less is known about younger VA enrollees' use of the private sector, or its funding. We compare payers for younger and older enrollees' private sector use in 3 hospitalization datasets. RESEARCH DESIGN: From 1998 to 2000, using private sector discharge data for VA enrollees in New York State, we categorized hospitalizations according to payer (self/family, private insurance, Medicare, Medicaid, other sources). We compared this payer distribution to population-weighted national Medical Expenditure Panel Survey (MEPS) data from 1996-2003 for veterans in VA healthcare. We also compared Medicare utilization in either dataset to hospitalizations for New York veterans from 1998-2000 in the VA-Medicare dataset. Analyses separated patients younger than age 65 from those age 65 or older. RESULTS: VA enrollees under age 65 obtain roughly half their hospitalizations in the private sector; older enrollees use the private sector at least twice as often as the VA. Datasets generally agree on payer distributions. Although older enrollees rely heavily on Medicare, they also use commercial insurance and self/family payments substantially. Half of younger enrollees' non-VA hospitalizations are paid by private insurance, but Medicare, Medicaid, and self/family each pay for one-quarter to one-third of admissions. CONCLUSIONS: VA enrollees use the private sector for most of their inpatient care, which is funded by multiple sources. Developing a national UB-92/VA dataset would be critical to understanding veterans' use of the private sector for specific diagnoses and procedures, particularly for the fast growing population of younger veterans.     

Brief report: Comparison of methods to identify Iraq and Afghanistan war veterans using Department of Veterans Affairs administrative data

The Department of Veterans Affairs (VA) has made treatment and care of Operation Iraqi Freedom/Operation Enduring Freedom (OIF/OEF) veterans a priority. Researchers face challenges identifying the OIF/OEF population because until fiscal year 2008, no indicator of OIF/OEF service was present in the Veterans Health Administration (VHA) administrative databases typically used for research. In this article, we compare an algorithm we developed to identify OIF/OEF veterans using the Austin Information Technology Center administrative data with the VHA Support Service Center OIF/OEF Roster and veterans' self-report of military service. We drew data from two different institutional review board-approved funded studies. The positive predictive value of our algorithm compared with the VHA Support Service Center OIF/OEF Roster and self-report was 92% and 98%, respectively. However, this method of identifying OIF/OEF veterans failed to identify a large proportion of OIF/OEF veterans listed in the VHA Support Service Center OIF/OEF Roster. Demographic, diagnostic, and VA service use differences were found between veterans identified using our method and those we failed to identify but who were in the VHA Support Service Center OIF/OEF Roster. Therefore, depending on the research objective, this method may not be a viable alternative to the VHA Support Service Center OIF/OEF Roster for identifying OIF/OEF veterans.     

Evaluating the Use of Medicare Part D in the Veteran Population With Spinal Cord Injury/Disorder

Objective

To examine the different sources of medications, the most common drug classes filled, and the characteristics associated with Medicare Part D pharmacy use in veterans with spinal cord injury/disorder (SCI/D).

Racial disparities in VA service connection for posttraumatic stress disorder disability

BACKGROUND: "Service connected" veterans are those with documented, compensative conditions related to or aggravated by military service, and they receive priority for enrollment into the Veterans Affairs (VA) health care system. For some veterans, service connection represents the difference between access to VA health care facilities and no access. OBJECTIVES: To determine whether there are racial discrepancies in the granting of service connection for posttraumatic stress disorder (PTSD) by the Department of Veterans Affairs and, if so, to determine whether these discrepancies could be attributed to appropriate subject characteristics, such as differences in PTSD symptom severity or functional status. RESEARCH DESIGN: Mailed survey linked to administrative data. Claims audits were conducted on 11% of the sample. SETTING AND SUBJECTS: The study comprised 2700 men and 2700 women randomly selected from all veterans filing PTSD disability claims between January 1, 1994 and December 31, 1998. RESULTS: A total of 3337 veterans returned usable surveys, of which 17% were black. Only 16% of respondents carried private health insurance, and 44% reported incomes of 20,000 US dollars or less. After adjusting for respondents' sociodemographic characteristics, symptom severity, functional status, and trauma histories, black persons' rate of service connection for PTSD was 43% compared with 56% for other respondents (P = 0.003). CONCLUSION: Black persons' rates of service connection for PTSD were substantially lower than other veterans even after adjusting for differences in PTSD severity and functional status.     

Accuracy and completeness of Medicare claims data for surgical treatment of breast cancer

BACKGROUND: Although a number of studies have used Medicare claims data to study trends and variations in breast cancer treatment, the accuracy and completeness of information on surgical treatment for breast cancer in the Medicare data have not been validated. OBJECTIVES: This study assessed the accuracy and completeness of Medicare claims data for breast cancer surgery to determine whether Medicare claims can serve as a source of data to augment information collected by cancer registries. METHODS: We used the Surveillance, Epidemiology and End Results (SEER) Cancer Registry-Medicare data and compared Medicare claims on surgery with the surgery recorded by the SEER registries for 23,709 women diagnosed with breast cancer at > or =65 years of age from 1991 through 1993. RESULTS: More than 95% of women having mastectomies according to the Medicare data were confirmed by SEER. For breast-conserving surgery, 91% of cases were confirmed by SEER. The Medicare physician services claims and inpatient claims were approximately equal in accuracy on type of surgery. The Medicare outpatient claims were less accurate for breast-conserving surgery. In terms of completeness, when the 3 claims sources were combined, 94% of patients receiving breast cancer surgery according to SEER were identified by Medicare. CONCLUSIONS: The combined Medicare claims database, which includes the inpatient, outpatient, and physician service claims, provides valid information on surgical treatment among women known to have breast cancer. The claims are a rich source of data to augment the information collected by tumor registries and provide information that can be used to follow long-term outcomes of Medicare beneficiaries.