Active_comparator: in person

Participants will get treatment via CA Bridge, California's statewide program to provide Emergency Department (ED)-based OUD treatment. When clinicians or staff suspect an ED patient may have OUD, they refer the patient to an ED-based counselor who assesses the patient and engages them in OUD care. All patients with OUD get brief counseling and take-home naloxone. Patients willing to start treatment get buprenorphine (via either ED- or home-based induction), a referral for in-person outpatient OUD treatment at a local outpatient clinic or opioid treatment program, and a bridge prescription of buprenorphine to last until their first outpatient appointment. CA Bridge counselors maintain contact with patients for up to 30 days to help them establish outpatient care. This is usual care in study hospitals and in the \>80% of California hospitals that participate in CA Bridge.

Experimental: telehealth

This arm will comprise the same elements as the in person arm except that patients will be referred to get outpatient OUD treatment via telehealth (i.e. phone or video visits). Depending on study site and patient insurance, participants will be referred to get treatment at either a clinic associated with their hospital that offers telehealth OUD treatment or from a digital health company that provides on-demand telehealth OUD treatment and support services via video and phone visits.