• Emma E McGinty, Mark C Bicket, Nicholas J Seewald, Elizabeth A Stuart, G Caleb Alexander, Colleen L Barry, Alexander D McCourt, and Lainie Rutkow.
• Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (E.E.M., N.J.S., A.D.M., L.R.).
• Ann. Intern. Med. 2022 May 1; 175 (5): 617-627.

BackgroundThere is concern that state laws to curb opioid prescribing may adversely affect patients with chronic noncancer pain, but the laws' effects are unclear because of challenges in disentangling multiple laws implemented around the same time.ObjectiveTo study the association between state opioid prescribing cap laws, pill mill laws, and mandatory prescription drug monitoring program query or enrollment laws and trends in opioid and guideline-concordant nonopioid pain treatment among commercially insured adults, including a subgroup with chronic noncancer pain conditions.DesignThirteen treatment states that implemented a single law of interest in a 4-year period and unique groups of control states for each treatment state were identified. Augmented synthetic control analyses were used to estimate the association between each state law and outcomes.SettingUnited States, 2008 to 2019.Patients7 694 514 commercially insured adults aged 18 years or older, including 1 976 355 diagnosed with arthritis, low back pain, headache, fibromyalgia, and/or neuropathic pain.MeasurementsProportion of patients receiving any opioid prescription or guideline-concordant nonopioid pain treatment per month, and mean days' supply and morphine milligram equivalents (MME) of prescribed opioids per day, per patient, per month.ResultsLaws were associated with small-in-magnitude and non-statistically significant changes in outcomes, although CIs around some estimates were wide. For adults overall and those with chronic noncancer pain, the 13 state laws were each associated with a change of less than 1 percentage point in the proportion of patients receiving any opioid prescription and a change of less than 2 percentage points in the proportion receiving any guideline-concordant nonopioid treatment, per month. The laws were associated with a change of less than 1 in days' supply of opioid prescriptions and a change of less than 4 in average monthly MME per day per patient prescribed opioids.LimitationsResults may not be generalizable to non-commercially insured populations and were imprecise for some estimates. Use of claims data precluded assessment of the clinical appropriateness of pain treatments.ConclusionThis study did not identify changes in opioid prescribing or nonopioid pain treatment attributable to state laws.Primary Funding SourceNational Institute on Drug Abuse.

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