H0015: Substance Use Intensive Outpatient (IOP) Billing
H0015 is the substance use intensive outpatient code, and its federal descriptor is unusually specific about what the program must be. That specificity is where IOP claims fail: a day that did not meet the program definition, an authorization that lapsed during step-down, or a per-diem billed alongside services it already includes.
Short answer
H0015 is "Alcohol and/or drug services; intensive outpatient (treatment program that operates at least 3 hours/day and at least 3 days/week and is based on an individualized treatment plan), including assessment, counseling; crisis intervention, and activity therapies or education." It is typically billed per day of attendance by Medicaid and some other payers, and it bundles the listed services, so billing them separately on an IOP day usually denies.
What the descriptor requires
- At least 3 hours a day. The program's day must meet the minimum the descriptor sets.
- At least 3 days a week. The program, not each patient's attendance, must operate at this frequency.
- An individualized treatment plan. Services must follow a plan specific to the patient.
- Bundled services. Assessment, counseling, crisis intervention, and activity therapies or education are included.
How it is billed
Most payers using H0015 pay per day of attendance, with the state or plan defining the daily minimum and whether partial days count. Commercial payers often bill intensive outpatient differently, through revenue codes or other per-diem codes, so H0015 is mainly a Medicaid and public-program code. See IOP and PHP billing for how the structures compare.
Authorization and step-down
IOP almost always needs prior authorization and concurrent review. The common failure is timing: a patient steps down from partial hospitalization or residential care into IOP, the old authorization ends, and the new one is not in place for the first days billed. Track authorization dates against attendance, not against the episode.
Common denials
- Day did not meet the program minimum. Attendance documentation shows fewer hours than required.
- Bundled service billed separately. Counseling or assessment billed alongside H0015 on the same day.
- Authorization gap. Days billed before the IOP authorization began or after it ended.
- Wrong program modifier. States requiring HF or age modifiers deny without them. See licensure and program modifiers.
Before admission, see H0001 and H0002 and verification of benefits. The full code map is in H codes in behavioral health.
Federal HCPCS descriptors only. Your state Medicaid manual and each managed care contract define who may render the service, unit rules, caps, and rates. Verify against current guidance before billing.
Frequently asked questions
What is H0015?
Alcohol and/or drug intensive outpatient: a program operating at least 3 hours a day and 3 days a week on an individualized treatment plan, including assessment, counseling, crisis intervention, and activity therapies or education.
Is H0015 billed per day?
Usually. Payers that use H0015 typically pay per day of attendance, with the state or plan defining the daily minimum. Confirm the unit in your state manual.
Can counseling be billed separately on an H0015 day?
Usually not. Counseling and assessment are included in the descriptor, so billing them separately on an IOP day commonly denies as bundled.
Why do IOP claims get denied after step-down?
Because the authorization for the prior level of care ends and the IOP authorization is not in place for the first days billed. Track authorization dates against attendance.
IOP days, matched to their authorizations.
See Stable track IOP authorizations against attendance and catch gaps before the claim goes out.
Book a Demo