H0015 Billing Rules and Rates in Oregon, Washington, and Idaho

As of September 2026, H0015 is an active, reimbursed intensive outpatient program (IOP) code under Oregon Medicaid fee-for-service, paid at $120.09 per service day, and under Idaho's Magellan IBHP network, paid at $154.32 per diem effective July 1, 2026. Washington Apple Health does not recognize H0015 for IOP billing at all: Washington pays for the same level of care through itemized component codes for substance use disorder (SUD) programs and through code S9480 with the HK modifier for mental health IOP. Operators running a multi-state IOP book cannot use one billing logic across all three states, and claims built on a single H0015 rule set will deny in Washington every time.

What Does H0015 Actually Cover?

H0015 is a HCPCS Level II code defined as "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 a bundled, per-service-day code: one line covers the full day's programming rather than itemizing individual and group therapy hours separately. Clinically, it corresponds to ASAM Level 2.1 (intensive outpatient), the tier between standard outpatient (Level 1) and partial hospitalization (Level 2.5).

Because H0015 bundles an entire day of programming into one claim line, whether a state's Medicaid program accepts it at all is a structural billing decision, not a minor technicality, and that decision differs across Oregon, Washington, and Idaho.

How Much Does Oregon Medicaid Pay for H0015?

Oregon Health Authority's current Behavioral Health Fee Schedule lists H0015 at $120.09 per service (one billed unit equals one day of IOP programming), payable to providers operating within an OHA-certified SUD program. The two modifiers that matter:

• HF. Required to indicate the service was delivered within an OHA-certified chemical dependency facility. The code will deny without it.
• GT. Added when the session was delivered via interactive audio-video telehealth rather than in person.

Fee-for-service claims are governed by OAR 410-172-0640, which sets Oregon's Medicaid behavioral health rate-setting methodology, and the underlying program design sits under OAR chapter 309, division 19 (Outpatient Behavioral Health Services), which is the same rule set our Oregon IOP licensing guide walks through for program design and COA approval. OHA has stated it manages SUD services through retrospective review rather than routine prospective prior authorization for standard HF-modifier claims, a meaningfully lighter administrative burden than Idaho's network-gated model below.

The caveat every operator needs: most Oregon Medicaid members are enrolled in a Coordinated Care Organization (CareOregon, Trillium, PacificSource, Health Share, and others), not fee-for-service. The $120.09 FFS rate is the state's reference floor; CCO-contracted rates for H0015 are negotiated separately and can run higher or lower depending on the plan and your credentialing leverage. Our Oregon CCO contracting playbook covers how to negotiate against that floor rather than simply accepting it.

Why Doesn't Washington Apple Health Use H0015 for IOP?

This is the fact that catches multi-state operators off guard. Washington's Substance Use Disorder (SUD) Fee-for-Service Billing Guide (effective April 1, 2026) does not list H0015 anywhere in its outpatient SUD coverage table. Washington instead requires SUD IOP to be billed as itemized component services under WAC 246-341-0640 documentation standards:

• H0004. Individual therapy, billed per 15 minutes, modifier HF.
• 96164 / 96165. Group health behavior intervention, initial 30 minutes and each additional 15 minutes, modifier HF.
• 96167 to 96171. Family health behavior intervention codes, with and without the client present, modifier HF.

A day of IOP programming in Washington is reconstructed from several line items rather than billed as one bundled H0015 claim. For mental health IOP specifically (as opposed to SUD IOP), Washington's Mental Health Services Billing Guide (effective January 1, 2026) uses a different bundled code entirely: S9480 ("intensive outpatient psychiatric services, per diem"), billed with the HK modifier under provider taxonomy 251S00000X, and only by behavioral health agencies, not by individual practitioners. Confusingly, S9480 appears elsewhere in the same guide as a "high intensity treatment" code that is explicitly excluded from IOP use; it only applies to IOP and PHP when billed under the dedicated behavioral health agency taxonomy with the HK modifier. Get that modifier or taxonomy wrong and the claim denies regardless of clinical documentation.

Licensure itself runs through WAC 246-341, the same chapter covered in our Washington IOP licensing guide, but licensure and billing are two separate systems here, and a program that is correctly certified can still bill incorrectly if it assumes Oregon's H0015 logic carries over.

What Does Idaho's Magellan IBHP Pay for H0015?

Idaho has no state Medicaid fee-for-service behavioral health billing system in the Oregon or Washington sense. Nearly all Idaho Medicaid behavioral health revenue runs through Magellan of Idaho, the single administrative services organization holding the Idaho Behavioral Health Plan (IBHP) contract. Magellan's published outpatient rate schedule pays H0015 at $154.32 per diem, effective July 1, 2026, explicitly mapped to ASAM Level 2.1 substance use disorder programming. The rate is uniform across provider types (physician, psychologist, master's-level clinician, and APRN/PA), which simplifies staffing-mix billing decisions relative to Oregon and Washington's provider-type-differentiated schedules.

The practical gate in Idaho is not the code, since H0015 works and pays well. It is network access. Because IDAPA 16.07.17 requires national accreditation (CARF, Joint Commission, or COA) rather than a conventional state facility license, and because Magellan is the sole payer conduit, an IOP program cannot generate H0015 revenue in Idaho until it clears Magellan's IBHP credentialing and contracting process. Our Magellan of Idaho enrollment guide covers that process in detail; it is the real bottleneck between "licensed" and "billing."

H0015 Billing at a Glance: Oregon vs. Washington vs. Idaho

What Are the Most Common H0015 Denial Reasons in Each State?

• Oregon, missing the HF modifier. Claims submitted without HF, or from a program that is not currently OHA-certified as a chemical dependency facility, deny outright regardless of documentation quality.
• Oregon, billing the CCO at the FFS rate. Submitting claims to a CCO using the fee-for-service rate as an assumed contracted rate, rather than the plan's actual negotiated rate, produces underpayments that look like "processing errors" but are really a contracting gap.
• Washington, billing H0015 at all. This is the single most expensive mistake a multi-state operator makes: treating Washington like Oregon and submitting a bundled H0015 claim. It is not a covered code in either the SUD or mental health fee-for-service systems, and it denies as a non-covered service every time.
• Washington, S9480 without the HK modifier or correct taxonomy. Because S9480 is excluded from IOP use in one part of the billing guide and required for IOP use in another, claims filed under the wrong taxonomy or missing HK are frequently denied even when clinically appropriate.
• Idaho, billing before Magellan credentialing is complete. A facility can be fully IDAPA-compliant and nationally accredited and still see every H0015 claim reject if IBHP network enrollment has not finished processing.

How Should a Multi-State IOP Operator Structure Its Billing Workflow?

Programs operating IOP in more than one of these three states need state-specific billing logic built into intake and claims workflows from day one, not retrofitted after the first denial batch. In practice that means:

• Separate claim templates by state. Oregon and Idaho can use a bundled per-diem template built around H0015; Washington needs an itemized-service template built around individual, group, and family component codes, or S9480 for mental health IOP specifically.
• Payer-source flags at intake. For Oregon and Washington, flag whether the client is FFS or CCO/MCO-enrolled at intake, since the billing pathway and the applicable rate depend on it.
• Credentialing status as a billing gate. In Idaho, tie IBHP network status to a hard stop in the billing workflow so claims are not generated, and denied, before Magellan enrollment finalizes.
• Modifier audits on a monthly cadence. HF, GT, and HK are the difference between a paid claim and a denial in this billing niche; a monthly modifier audit catches drift before it becomes a denial backlog.

H0015 Billing FAQs

Is H0015 a valid billing code in Washington?

No. As of April 2026, Washington Apple Health's SUD and mental health fee-for-service billing guides do not include H0015 in their coverage tables. Washington bills SUD IOP as itemized component codes and mental health IOP as S9480 with the HK modifier.

How much does Oregon Medicaid pay for H0015?

Oregon Health Authority's current fee-for-service Behavioral Health Fee Schedule pays $120.09 per service day for H0015 with the HF modifier. CCO-contracted rates, which cover most Oregon Medicaid members, are negotiated separately from this FFS reference rate.

What is Idaho's Medicaid rate for H0015?

Magellan of Idaho's IBHP outpatient rate schedule pays $154.32 per diem for H0015, effective July 1, 2026, uniformly across physician, psychologist, master's-level, and APRN/PA provider types.

Does H0015 require prior authorization?

In Oregon, standard HF-modifier claims are generally handled through retrospective review rather than routine prospective prior authorization. In Idaho, the equivalent gate is Magellan IBHP network credentialing, which must be completed before any claim pays. Washington's question is moot for H0015 specifically, since the code is not covered there.

What ASAM level does H0015 correspond to?

H0015 maps to ASAM Level 2.1, intensive outpatient treatment, the tier between standard outpatient (Level 1) and partial hospitalization (Level 2.5).

Can the same clinical program bill differently in each state without changing its services?

Yes, and it should. The clinical program (hours per week, staffing, individualized treatment plan) can be identical across Oregon, Washington, and Idaho locations under ASAM 2.1 criteria; only the billing code, modifier, and claims structure need to change by state.

Getting H0015 Billing Right the First Time

Getting IOP billing right across Oregon, Washington, and Idaho is not a documentation problem. It is a systems problem: the wrong code, the wrong modifier, or a credentialing gap that closes long after the clinical team has already delivered the service. Saint Health Group builds the billing infrastructure alongside the clinical and licensing work rather than treating revenue cycle as an afterthought. We write the payer-contracting strategy, set up state-specific claim logic, manage payer contracting and credentialing, and run the billing operations that keep H0015, and every other code your program depends on, actually getting paid. If your IOP program spans more than one of these three states, or you are launching in a new one, talk to our team about building a billing workflow that matches each state's rules instead of assuming they are all the same.