Abstract
OBJECTIVES: To describe the continuity of opioid prescribing and prescriber characteristics among older adults with chronic noncancer pain (CNCP) who are on long-term opioid therapy (LTOT) and to evaluate the association of continuity of opioid prescribing and prescriber characteristics with the risk of opioid-related adverse events. STUDY DESIGN: Nested case-control design. METHODS: This study employed a nested case-control design using a 5% random sample of the national Medicare administrative claims data for 2012-2016. Eligible individuals experiencing a composite outcome of opioid-related adverse events were defined as cases and matched to controls using incidence density sampling. Continuity of opioid prescribing (operationalized using the Continuity of Care Index) and prescriber specialty were assessed among all eligible individuals. Conditional logistic regression was conducted to assess the relationships of interest after accounting for known confounders. RESULTS: Individuals with low (odds ratio [OR], 1.45; 95% CI, 1.08-1.94) and medium (OR, 1.37; 95% CI, 1.04-1.79) continuity of opioid prescribing were found to have greater odds of experiencing a composite outcome of opioid-related adverse events compared with individuals with high prescribing continuity. Fewer than 1 in 10 (9.2%) older adults starting a new LTOT episode received at least 1 prescription from a pain specialist. Receiving a prescription from a pain specialist was not significantly associated with the outcome in adjusted analyses. CONCLUSIONS: We found that higher continuity of opioid prescribing, but not provider specialty, was significantly associated with fewer opioid-related adverse outcomes among older adults with CNCP.