Better Nurse Practitioner Primary Care Practice Environments Reduce Hospitalization Disparities Among Dually-Enrolled Patients.

Background: Over 12 million Americans are dually enrolled in Medicare and Medicaid. These individuals experience over twice as many hospitalizations for chronic diseases such as coronary artery disease and diabetes compared with Medicare-only patients. Nurse practitioners (NPs) are well-positioned to address the care needs of dually-enrolled patients, yet NPs often work in unsupportive clinical practice environments. The purpose of this study was to examine the association between the NP primary care practice environment and hospitalization disparities between dually-enrolled and Medicare-only patients with chronic diseases.

Methods: Using secondary cross-sectional data from the Nurse Practitioner Primary Care Organizational Climate Questionnaire and Medicare claims files, we examined 135,648 patients with coronary artery disease and/or diabetes (20.0% dually-eligible, 80.0% Medicare-only), cared for in 450 practices employing NPs across 4 states (PA, NJ, CA, FL) in 2015. We compared dually-enrolled patients' odds of being hospitalized when cared for in practice environments characterized as poor, mixed, and good based on practice-level Nurse Practitioner Primary Care Organizational Climate Questionnaire scores.

Results: After adjusting for patient and practice characteristics, dually-enrolled patients in poor practice environments had the highest odds of being hospitalized compared with their Medicare-only counterparts [odds ratio (OR): 1.48, CI: 1.37, 1.60]. In mixed environments, dually-enrolled patients had 27% higher odds of a hospitalization (OR: 1.27, CI: 1.12, 1.45). However, in the best practice environments, hospitalization differences were nonsignificant (OR: 1.02, CI: 0.85, 1.23).

Conclusions: As policymakers look to improve outcomes for dually-enrolled patients, addressing a modifiable aspect of care delivery in NPs' clinical practice environment is a key opportunity to reduce hospitalization disparities.