The impact of integration on outpatient chemotherapy use and spending in Medicare

Practice Consolidation Among US Medical Oncologists, 2015-2022

PURPOSE

Health care consolidation has significantly affected cancer care delivery, with oncology practices undergoing substantial consolidation over the past two decades. This study investigates practice consolidation trends among medical oncologists (MOs), factors associated with consolidation, and changes in MO geographic distribution.

METHODS

Medicare data from 2015 to 2022 were used to assess MO practice consolidation in hospital referral regions (HRRs), linked with regional health care market data and physician demographics. The Herfindahl-Hirschman Index (HHI) was used to measure consolidation, and the Gini coefficient was used to measure MO distribution across counties. Multivariable linear regression explored factors associated with MO practice consolidation.

RESULTS

Between 2015 and 2022, the number of MOs increased by 14.5% (11,727-13,433), whereas the number of MO practices decreased by 18.0% (2,774-2,276). The mean number of MOs per practice increased by 40% (4.26-5.95; P < .001). The percentage of MOs in small practices decreased, whereas larger practices saw an increase. MO consolidation, as indicated by the HHI, increased by 9% (median HHI, 0.3204-0.3480). HRRs with higher baseline hospital consolidation and more hospital beds per capita were more likely to have MO practice consolidation. Despite MO practice consolidation, the county-level distribution of MOs did not change substantially.

CONCLUSION

On the basis of Federal Trade Commission classifications, MO practices were highly concentrated in 2015 and consolidated even further by 2022. While distribution of MOs at the county level remained stable, further research is needed to assess the effects of rapid consolidation on cancer care cost, quality, and access. These data have important implications for policymakers and payers as they design programs that ensure high-quality, affordable cancer care.

Cost, Quality, and Utilization After Hospital-Physician and Hospital-Post Acute Care Vertical Integration: A Systematic Review

Vertical integration of health systems-the common ownership of different aspects of the health care system-continues to occur at increasing rates in the United States. This systematic review synthesizes recent evidence examining the association between two types of vertical integration-hospital-physician (n = 43 studies) and hospital-post-acute care (PAC; n = 10 studies)-and cost, quality, and health services utilization. Hospital-physician integration is associated with higher health care costs, but the effect on quality and health services utilization remains unclear. The effect of hospital-PAC integration on these three outcomes is ambiguous, particularly when focusing on hospital-SNF integration. These findings should raise some concern among policymakers about the trajectory of affordable, high-quality health care in the presence of increasing hospital-physician vertical integration but perhaps not hospital-PAC integration.

Hospital-physician integration and clinical volume in traditional Medicare

OBJECTIVE

To test the effect of hospital-physician integration on primary care physicians' (PCP) clinical volume in traditional Medicare.

DATA SOURCES AND STUDY SETTING

Nationwide retrospective longitudinal study using Medicare claims and other data sources from 2010 to 2016.

STUDY DESIGN

We identified 70,000 PCPs, some of whom remained non-integrated and some who became hospital-integrated during this study period. We used an event study design to identify the effect of integration on key measures of physicians' clinical volume, including the number of claims, work-relative value units (RVUs), professional revenue generated, number of patients treated, and facility fee revenue generated.

PRINCIPAL FINDINGS

Per-physician clinical volume declined by statistically and economically significant margins. Relative to the comparison group who remained non-integrated, work RVUs fell by 7% (95% confidence interval [CI]: -8.6% to -5.5%); the number of patients treated fell by 4% (95% CI: -5.8% to -2.6%); and claims volume among PCPs who became hospital-integrated fell by over 15% (95% CI: -16.8% to -13.5%). Though professional revenue declined by $29,165 (95% CI: -$32,286 to -$26,044), this loss was almost entirely offset by increased facility fee revenue of $28,556 (95% CI: 26,909 to 30,203).

CONCLUSIONS

Hospital-physician integration may affect the quantity of clinical services delivered by PCPs to traditional Medicare beneficiaries. Reductions in clinical volume associated with integration may have long-term consequences for the supply of physician services and patient access to primary care. Future research on physician time use and patient access following hospital integration would further add to the evidence base.

Racial Disparities in Breast Cancer Treatments and Adverse Events in the SEER-Medicare Data

Despite lower incidence rates, African American (AA) patients have shorter survival from breast cancer (BC) than white (W) patients. Multiple factors contribute to decreased survival, including screening disparities, later presentation, and access to care. Disparities in adverse events (AEs) may contribute to delayed or incomplete treatment, earlier recurrence, and shortened survival. Here, we analyzed the SEER-Medicare dataset, which captures claims from a variety of venues, in order to determine whether the cancer care venues affect treatment and associated adverse events. We investigated a study population whose claims are included in the Outpatient files, consisting of hospital and healthcare facility venues, and a study population from the National Claims History (NCH) files, consisting of claims from physicians, office practices, and other non-institutional providers. We demonstrated statistically and substantively significant venue-specific differences in treatment rates, drugs administered, and AEs from treatments between AA and W patients. We showed that AA patients in the NCH dataset received lower rates of treatment, but patients in the Outpatient dataset received higher rates of treatment than W patients. The rates of recorded AEs per treatment were higher in the NCH setting than in the Outpatient setting in all patients. AEs were consistently higher in AA patients than in W patients. AA patients had higher comorbidity indices and were younger than W patients, but these variables did not appear to play roles in the AE differences. The frequency of specific anticancer drugs administered in cancer- and venue-specific circumstances and their associated AEs varied between AA and W patients. The higher AE rates were due to slightly higher frequencies in the administration of drugs with higher associated AE rates in AA patients than in W patients. Our investigations demonstrate significant differences in treatment rates and associated AEs between AA and W patients with BC, depending on the venues of care, likely contributing to differences in outcomes.

Hospital-Physician Integration Is Associated With Greater Use Of Cardiac Catheterization And Angioplasty

In the US in recent years, hospital-physician integration has become a dominant form of consolidation in health care. This transition away from independent practice has raised questions about whether hospital-employed physicians may be more likely than independent physicians to refer patients to high-intensity, hospital-based services. We used Medicare claims data from the period 2013-20 to identify patients who received a new diagnosis of stable angina, a common cardiovascular condition that entails clinical discretion in treatment choice. Using linear probability models and an instrumental variables model, we found that patients whose care was managed by a hospital-integrated cardiologist were no more likely to receive stress tests (an office-based procedure) than those whose care was managed by an independent cardiologist. However, these patients were much more likely to receive high-intensity, hospital-based coronary interventions. These results suggest that hospital-physician integration is an important factor in the intensity of treatment received by patients with stable angina. Policy makers may see these findings as additional impetus for more aggressive antitrust enforcement of integrated arrangements between hospitals and physicians and for other regulatory or payment mechanisms that might deter hospitals from using such arrangements to promote high-intensity treatment unnecessarily.

Vertical integration of oncologists and cancer outcomes and costs in metastatic castration-resistant prostate cancer

BACKGROUND

The share of oncology practices owned by hospitals (ie, vertically integrated) nearly doubled from 2007 to 2017. We examined how integration between hospitals and oncologists affected care quality, outcomes, and spending among metastatic castration-resistant prostate cancer (mCRPC) patients.

METHODS

Using Surveillance, Epidemiology, and End Results-Medicare linked data and the Medicare Data on Provider Practice and Specialty, we identified Medicare beneficiaries who initiated systemic therapy for mCRPC between 2008 and 2017 (n = 9172). Primary outcomes included 1) bone-modifying agents (BMA) use, 2) time on systemic therapy, 3) survival, and 4) Medicare spending for the first 3 months following therapy initiation. We used a differences-in-differences approach to estimate the impact of vertical integration on outcomes, adjusting for patient and provider characteristics.

RESULTS

The proportion of patients treated by integrated oncologists increased from 28% to 55% from 2008 to 2017. Vertical integration was associated with an 11.7 percentage point (95% confidence interval [CI] = 4.2 to 19.1) increased likelihood of BMA use. There were no satistically significant changes in time on systemic therapy, survival, or total per-patient Medicare spending. Further decomposition showed an increase in outpatient payment ($5190, 95% CI = $1451 to $8930) and decrease in professional service payment (-$4757, 95% CI = -$7644 to -$1870) but no statistically significant changes for other service types (eg, inpatient and prescription drugs).

CONCLUSIONS

Vertical integration was associated with statistically significant increased BMA use but not with other cancer outcomes among mCRPC patients. For oncologists who switched service billing from physician offices to outpatient departments, there was no statistically significant change in overall Medicare spending in the first 3 months of therapy initiation. Future studies should extend the investigation to other cancer types and patient outcomes.

Access to urologists for participation in research: An analysis of NCI's Community Oncology Research Program landscape survey

Purpose

Urological cancer clinical trials face accrual challenges, which may stem from structural barriers within cancer programs. We sought to describe the extent to which urology cancer care providers are available within community cancer research programs and explore the role of oncology practice group ownership in their access to urology practices to participate in research.

Materials and methods

We conducted secondary analysis of organizational survey data collected in 2017 among National Cancer Institute Community Oncology Research Program practice groups. We used logistic regression to assess the association of self-reported access to urologists to participate in research and oncology practice group ownership type: independent, payor-provider, health-system, or public ownership.

Results

Of the 209 community oncology practice groups in the analysis sample, 133 (63.6%) had access to urologists for research participation. Ownership was not statistically significantly associated with access to urology practices after controlling for other covariates (p = 0.4). Instead, having a hospital outpatient clinic (p = 0.008) and identifying as a safety-net hospital (p = 0.035) were both positively significantly associated with access to urologists to participate in research.

Conclusions

Two-thirds of community cancer research groups have access to urology. Oncology ownership status was not associated with access to urologists for research. Research groups may need support to increase their capacity to engage non-oncology cancer care providers in research.

Hospital-physician integration and risk-coding intensity

Hospital-physician integration has surged in recent years. Integration may allow hospitals to share resources and management practices with their integrated physicians that increase the reported diagnostic severity of their patients. Greater diagnostic severity will increase practices' payment under risk-based arrangements. We offer the first analysis of whether hospital-physician integration affects providers' coding of patient severity. Using a two-way fixed effects model, an event study, and a stacked difference-in-differences analysis of 5 million patient-year observations from 2010 to 2015, we find that the integration of a patient's primary care doctor is associated with a robust 2%-4% increase in coded severity, the risk-score equivalent of aging a physician's patients by 4-8 months. This effect was not driven by physicians treating different patients nor by physicians seeing patients more often. Our evidence is consistent with the hypothesis that hospitals share organizational resources with acquired physician practices to increase the measured clinical severity of patients. Increases in the intensity of coding will improve vertically-integrated practices' performance in alternative payment models and pay-for-performance programs while raising overall health care spending.

Accountable care organizations and physician antibiotic prescribing behavior

BACKGROUND

Physician accountable care organization (ACO) affiliation has been found to reduce cost and improve quality across metrics that are directly measured by the Medicare ACO programs. However, little is known about potential spillover effects from this program onto non-measured physician behavior such as antibiotic prescribing.

METHODS

Using a two-part structural selection model that accounts for selection into treatment (ACO group), and non-treatment (control group), we compare physician antibiotic prescribing across these groups with adjustment for volume, patient, physician and institutional characteristics. We also estimate heterogeneous treatment responses across specialties, focusing on physicians with a primary specialty of internal medicine, family or general practice, nurse practitioners, as well as general and orthopedic surgeons.

RESULTS

We find that ACO affiliation helps reduce antibiotic prescribing by 20.4 (95%CI = -26.65 to -14.16, p-value<0.001) prescriptions (about 19.5%) per year. We show that each additional hospital and practice affiliation increases prescriptions by 1.6 (95%CI = 1.27 to 1.95, p-value<0.001) and 1.7 (95%CI = 1.00 to 2.47, p-value<0.001), respectively. However, the use of electronic health records and high-quality medical training is associated with a decrease in antibiotic use of 7.9 (95%CI = -8.79 to -7.07, p-value<0.001) and 3.6 (95%CI = -4.47 to -2.73, p-value<0.001) claims, respectively. The treatment effects are found to vary with specialty, where internal medicine physicians experience an average decrease of 23.6 (95%CI = -29.98 to -17.20, p-value<0.001), family and general practice physicians a decrease of 22.1 (95%CI = -28.37 to -15.77, p-value<0.001), nurse practitioners a decrease of 7.1 (95%CI = -13.99 to -0.77, p-value = 0.028), general surgeons a decrease of 9.6 (95%CI = -16.02 to -3.25, p-value = 0.003), and orthopedic surgeons a reduction of 8.1 (95%CI = -14.84 to -1.42, p-value = 0.018) in their antibiotic prescribing per year.

CONCLUSIONS

In assessing the impact of Medicare ACO programs it is important to account for spillover effects. Our study finds that ACO affiliation has had a measurable impact on physician antibiotic prescribing.

Vertical integration in healthcare: What does literature say about improvements on quality, access, efficiency, and costs containment?

INTRODUCTION

Vertical integration models involve integrating services from different levels of care (e.g., primary care, acute care, post-acute care). Therefore, one of their main objectives is to increase continuity of care, potentially improving outcomes like efficiency, quality, and access or even enabling cost containment.

OBJECTIVES

This study conducts a literature review and aims at contributing to the contentious discussion regarding the effects of vertical integration reforms in terms of efficiency, costs containment, quality, and access.

METHODS

We performed a systematic search of the literature published until February 2020. The articles respecting the conceptual framework were included in an exhaustive analysis to study the impact of vertical integration on costs, prices of care, efficiency, quality, and access.

RESULTS

A sample of 64 papers resulted from the screening process. The impact of vertical integration on costs and prices of care appears to be negative. Decreases in technical efficiency upon vertical integration are practically out of the question. Nevertheless, there is no substantial inclination to visualise a positive influence. The same happens with the quality of care. Regarding access, the lack of available articles on this outcome limits conjectures.

CONCLUSIONS

In summary, it is not clear yet whether vertically integrated healthcare providers positively impact the overall delivery care system. Nevertheless, the recent growing trend in the number of studies suggests a promising future on the analysis of this topic.

Treatment consolidation after vertical integration: Evidence from outpatient procedure markets

Hospital ownership of physician practices has grown across the US, and these strategic decisions seem to drive higher prices and spending. Using detailed physician ownership information and a universe of Florida discharge records, we show novel evidence of hospital-physician integration foreclosure effects within outpatient procedure markets. Following hospital acquisition, physicians shift nearly 10% of their Medicare and commercially insured cases away from ambulatory surgery centers (ASCs) to hospitals and are up to 18% less likely to use an ASC at all. Altering physician choices over treatment setting can be in conflict with patient and payer cost, convenience, and quality preferences.