HCPCS code H0039 – Assertive community treatment, face-to-face

Key takeaways

HCPCS code H0039 reports assertive community treatment (ACT) delivered face-to-face, billed in 15-minute units

H0040 is the ACT program per diem, so confirm whether your state pays ACT by the contact, the day, or the month

Only certified or state-approved ACT programs can bill H0039, and Oregon has restricted it to qualified ACT providers since July 1, 2023

Every unit needs a note with start and end times, the team member, and the treatment plan goal it served

Medicare does not pay H-codes, so state Medicaid programs and Medicaid managed care plans are the main payers

HCPCS code H0039: Official descriptor and code details

HCPCS code H0039 carries the official descriptor “Assertive community treatment, face-to-face, per 15 minutes.”

It sits in the H-series of HCPCS Level II codes, which the Centers for Medicare and Medicaid Services (CMS) maintains.

H-codes cover behavioral health and substance use treatment, and state Medicaid programs are their main users. H0039 has been an active code since January 1, 2003.

H0039 at a glance

Assertive community treatment is an evidence-based model for adults with serious mental illness who struggle to engage with office-based care. A multidisciplinary team brings treatment, rehabilitation, and support to the member’s home and community.

ACT teams usually include a team leader, a psychiatric prescriber, nurses, and substance use, employment, and peer specialists. Caseloads stay small, and the whole team shares responsibility for every member around the clock.

H0039 captures each face-to-face contact that team delivers, one 15-minute unit at a time.

What H0039 covers and what it excludes

H0039 pays for direct, face-to-face time between an ACT team member and the enrolled member. The content of each contact can vary widely, as long as it serves the treatment plan.

Covered services

• Medication delivery, administration, and monitoring in the member’s home
• Psychiatric and nursing contacts for symptom and side-effect management
• Crisis assessment and stabilization by the ACT team itself
• Help with housing, benefits, budgeting, and other daily living skills
• Supported employment and education contacts
• Integrated treatment for co-occurring substance use
• Face-to-face contact with family or support network members, where the state plan allows it

Exclusions

Billing H0039 for indirect time is a common audit finding. Auditors match billed units against note times, so a unit without a documented contact gets recovered.

HCPCS code H0039 vs adjacent codes

H0038, H0039, and H0040 sit side by side, and two of them describe ACT. H0007 enters the picture because ACT teams also handle crises, but it describes a different service.

The decision that matters most is H0039 versus HCPCS code H0040, and your state makes it for you. Some states pay ACT only by the 15-minute contact. Others pay the program a per diem. The flow below runs the three checks that decide which code a contact becomes.

A few states use both codes together. In Washington, DC, Medicaid moved ACT to a monthly H0040 unit on September 1, 2023. The H0039 contact lines on the claim now count toward the eight contacts that release that monthly payment.

Unless your payer runs a combined model like that, never bill H0039 and H0040 for the same member on the same day. For peer services outside ACT, see HCPCS code H0038. For outpatient substance use crisis work, see HCPCS code H0007.

Who can bill H0039? Program and staff requirements

The right to bill H0039 sits with the ACT program, not with an individual clinician. Most state Medicaid programs require the team to hold state ACT certification or approval.

Many states measure the team against a fidelity tool. Common examples are the Tool for Measurement of Assertive Community Treatment (TMACT) and the Dartmouth ACT Fidelity Scale (DACTS).

Oregon shows how strict this has become. Since July 1, 2023, the Oregon Health Authority has restricted H0039 to qualified ACT providers under its ACT rules.

Typical requirements include:

• State ACT program certification on file for the billing NPI
• A team that meets the state’s staffing ratios and required disciplines
• Rendering staff whose credentials match the state’s ACT staffing rules
• An adult member with a serious mental illness who meets the state’s ACT admission criteria

Members usually qualify through a diagnosis such as schizophrenia or bipolar disorder, plus repeated hospital or crisis use. Record how each member met those criteria, so the eligibility decision is on file before the first claim.

H0039 Medicaid billing: Units, rates, and payer rules

Medicare does not pay H0039, because it treats H-codes as not valid for Medicare purposes. State Medicaid programs and Medicaid managed care organizations (MCOs) are the main payers.

One unit equals 15 minutes of face-to-face contact. Many Medicaid manuals require at least 8 minutes before you can bill a single unit. Your state manual sets the exact rounding rule.

Each state Medicaid program sets its own:

• Unit rounding rules and daily or monthly unit caps
• Fee schedule rate per unit
• Prior authorization and reauthorization periods
• Choice of H0039, H0040, or both for ACT

There is no national rate for H0039. Pull the rate from your state Medicaid fee schedule or your MCO contract, and recheck it each fiscal year. The CMS HCPCS Level II code set confirms the descriptor, not the rate.

Documentation requirements for H0039 claims

Every billed unit needs a note that proves a face-to-face contact happened and served the treatment plan. Each note should include:

• Date, start time, and end time: These drive the unit count, so record clock times, never estimates.
• Location of the contact: Home, community setting, or office, matching the place of service on the claim.
• Team member and credential: The person who delivered the contact, matched to the state’s staffing rules.
• Face-to-face confirmation: State that the member was present, and how, if the payer accepts video.
• Intervention delivered: What the team member did, in specific terms.
• Treatment plan link: The goal the contact served, from a current, signed treatment plan.
• Member response and next steps: How the member responded and what the team will do next.

Keep the member’s ACT eligibility determination and current authorization on file too. Auditors often pull both before they read a single progress note.

If your ACT team runs a federally assisted substance use disorder program, 42 CFR Part 2 adds consent rules for those records. Build that into your medical billing compliance process.

Modifiers used with H0039

Modifier rules for H0039 are not standardized nationally. Check your state Medicaid provider manual or MCO addendum before each new payer goes live, and confirm the descriptor in the AAPC H0039 reference.

Common H0039 claim denials and how to fix them

Most H0039 denials trace back to authorization, certification, or unit counts. Denial management for ACT programs usually starts with these failure points:

When a denial needs a formal appeal, read the denial reason codes on the remittance advice first. Answer each code directly in the appeal letter, and attach the notes that prove the billed time.

How to bill H0039 correctly: Step-by-step

A clean H0039 claim follows the usual Medicaid workflow, with a few ACT-specific checkpoints added.

1. Verify eligibility: Confirm Medicaid enrollment for the date of service. Front-end insurance eligibility verification prevents most eligibility denials.
2. Confirm ACT enrollment and authorization: Check that the member is enrolled in your ACT program and that the authorization covers the date. A written prior authorization process keeps renewals on time.
3. Confirm the unit model: Check whether your payer pays H0039, H0040, or both, and whether any unit cap applies.
4. Document each contact the same day: Complete the note with the recorded start and end times before the claim goes out.
5. Calculate units from recorded times: Apply your state’s rounding rule to the documented minutes. Never estimate.
6. Complete the claim: On the CMS-1500, enter H0039 and its modifiers in box 24D and the place of service in 24B. Add units in 24G, the authorization number in box 23, and the rendering NPI in 24J. Map the same data to the 837P for electronic claims.
7. Submit and track: Send the claim through your claims workflow and follow up on any H0039 claim with no remittance after 30 days.

Can H0039 be billed via telehealth?

The descriptor says face-to-face, and most states read that as in person. Some states accept live audio-video contact as face-to-face for ACT. Audio-only contact usually does not qualify unless the state says so.

Where your state allows video for H0039, billing typically requires:

• Modifier 95 or GT, as your payer directs
• Place of service 02 (telehealth outside the member’s home) or 10 (telehealth in the member’s home)
• A note that names the platform and confirms the session used live audio and video
• The member’s consent to telehealth, recorded in the chart

ACT is built on in-person community contact, so a fidelity review may flag a team that leans heavily on video. Check your state’s current ACT telehealth policy before you schedule video contacts.

How Pabau supports ACT documentation and billing

Most ACT teams document in cars, kitchens, and shelters. Notes often land in paper logs or spreadsheets, and someone rebuilds the unit count before billing.

Pabau’s practice management platform keeps the schedule, the member record, and billing in one place. Team members record treatment notes against each appointment, and intake and consent forms sit in the same record.

Pabau Scribe, our AI scribe, can draft a note from the conversation for the team member to review. Pabau GO, our iOS app for practitioners, brings Pabau to the team’s phones between community visits.

Insurance billing runs through Pabau’s claims management software, so claims go out from the same record that holds the note. The result is fewer units lost between the visit and the claim.

Keep ACT notes and claims in one place

Pabau brings scheduling, treatment notes, intake forms, and insurance billing into one platform. Every ACT contact gets recorded against the member’s record, ready to bill.

Book a demo

Conclusion

H0039 rewards ACT teams that treat every contact as a billable unit and every note as evidence. The code itself is simple: face-to-face ACT time, counted in 15-minute units.

The risk sits in the state rules around it. Before your first claim, confirm whether your state pays H0039, H0040, or both. Then confirm the rounding rule and whether video counts as face-to-face.

Settle those three points, and most H0039 denials never happen. To see how Pabau keeps ACT notes and claims together, book a demo.

Continue your research

Billing ACT by the day instead? HCPCS code H0040 covers the assertive community treatment program per diem and its documentation rules.

Running peer services outside an ACT team? HCPCS code H0038 explains how to bill self-help and peer services per 15 minutes.

Need a foundation in Medicaid billing basics? Medical billing fundamentals explains the end-to-end claims workflow behind every HCPCS code submission.

Seeing repeat denials across your behavioral health claims? Denial management in healthcare covers how to build a systematic denial reduction program.

Billing case management outside an ACT team? HCPCS code T1017 explains how to bill targeted case management and document each contact.

Frequently asked questions