Influence of Primary Care Provider Type on Chronic Pain Management Among Veterans

Background: Chronic pain disproportionately impacts veterans and is often treated in primary care, where physician shortages in the Veterans Health Administration (VHA) healthcare system are well documented. Nurse practitioners (NPs) may represent a solution to the care shortage; however, concerns of NP opioid overprescribing have led to NP practice and prescribing restrictions in individual VHA facilities and at the state level. Little is known regarding the prescribing patterns of NPs and physician assistants (PAs) for veterans with chronic pain in the VHA. Purpose: The purpose of this study was to compare opioid and non-opioid prescribing patterns of physicians, NPs, and PAs for chronic pain patients at VHA centers. Methods: We used data from the U.S. Department of Veterans Affairs Survey of Healthcare Experience of Patients and Corporate Data Warehouse from October 2015 to September 2016. Patient medical records for the year were analyzed by provider type (physician, NP, or PA) for differences in providers' rates of prescribing opioid and non-opioid medications, as well as characteristics of the opioid prescriptions (e.g., high daily morphine milligram equivalent [90 MME/day] dose, long-term opioid therapy [90 days]). Results: Medical records of a total of 39,936 patients were included. In FY 2016, 55% of patients received one opioid prescription, whereas 83.8% received one non-opioid prescription. Compared to patients of NPs and PAs, patients of physicians had higher odds of receiving opioid (vs. NPs: OR = 1.13, p < 0.01; vs. PAs: OR = 1.16, p < 0.01) and non-opioid prescriptions (vs. NPs: OR=1.08, p = 0.02; vs. PAs: OR=1.20, p < 0.01) after adjusting for patient characteristics. There were no differences in high MME/day dose (p = 0.59) or long-term opioid therapy (p = 0.99). Conclusion: In a national sample of veterans with chronic pain, NPs and PAs did not have higher odds of opioid prescribing. Concerns of NP or PA opioid overprescribing may be addressed by considering evidence that patients of these providers are not at higher odds of receiving an opioid prescription.