The Definitive HE Modifier Mental Health Billing Guide for 2026
If you've ever had a clean claim bounce back with a vague denial — or worse, gotten paid for a session only to face a recoupment audit six months later — there's a good chance modifier usage was somewhere in the chain of problems. And if you're billing behavioral health services under Medicaid or many commercial plans, the HE modifier is one you absolutely cannot afford to misuse.
This guide breaks down everything you need to know about the HE modifier in 2026: what it means, when to use it, how it interacts with other modifiers, which payers require it, and how to document your services so your claims hold up under scrutiny.
Let's get into it.
What Is the HE Modifier?
The HE modifier is a HCPCS Level II modifier that stands for "Mental Health Program." When appended to a CPT or HCPCS procedure code on a claim, it signals to the payer that the service being billed was rendered as part of a mental health program — not a substance use disorder (SUD) program, not a general medical program, but specifically a mental health context.
It's part of a broader family of behavioral health service modifiers defined by the Substance Abuse and Mental Health Services Administration (SAMHSA) coding taxonomy, which includes:
| Modifier | Description |
|---|---|
| HE | Mental Health Program |
| HF | Substance Abuse Program |
| HG | Opioid Addiction Treatment Program |
| HH | Integrated Mental Health/Substance Abuse Program |
| HI | Residential Care, Clinically Managed (Low Intensity) |
| HJ | Employee Assistance Program |
| HK | Specialized Mental Health Programs for High-Risk Populations |
| HS | Family/Couple with Client Present |
For most outpatient therapists, psychiatrists, LPCs, LCSWs, and LMFTs billing Medicaid or certain Medicaid managed care organizations (MCOs), the HE modifier is the workhorse of your modifier stack.
Why the HE Modifier Exists (And Why It Matters More in 2026)
The HE modifier was originally developed to help state Medicaid programs track and categorize spending across behavioral health service domains. When a state wants to know how much it's paying for mental health services versus substance use disorder treatment, modifier data is one of the primary ways that distinction gets made.
But in 2026, the HE modifier has taken on even more significance for a few key reasons:
1. Medicaid Managed Care Expansion
With nearly 90% of Medicaid beneficiaries now enrolled in managed care plans (per CMS data), MCOs have enormous latitude in setting their own billing policies — including whether and how modifiers are required. Many state MCOs have hardcoded HE modifier requirements into their claim edits, meaning a missing HE will trigger an automatic denial before a human ever reviews the claim.
2. Increased Behavioral Health Audit Activity
The OIG's 2025 and 2026 Work Plans have flagged behavioral health billing — particularly Medicaid behavioral health — as a high-priority audit target. Proper modifier usage is one of the first things auditors look at when determining whether a billed service was rendered in the appropriate program context.
3. Parity Enforcement Scrutiny
Under the Mental Health Parity and Addiction Equity Act (MHPAEA), payers are under increasing federal pressure to demonstrate that they're applying the same utilization management standards to mental health benefits as to medical/surgical benefits. Correct modifier usage helps establish a clean administrative record that supports parity compliance on both sides.
When to Use the HE Modifier: The Practical Breakdown
Here's the straightforward rule: Use HE when you are billing for services delivered in the context of a mental health program and the payer requires or accepts it.
More specifically, you'll typically append HE to:
- Psychotherapy CPT codes (90832, 90834, 90837, 90847, 90853)
- Psychiatric evaluation codes (90791, 90792)
- Add-on psychotherapy codes (90833, 90836, 90838 — when billed with E/M codes)
- Crisis codes (90839, 90840)
- Health and behavior assessment/intervention codes (96150–96161, when used in a mental health context)
- Community-based and case management codes (T1016, T1017, H0032, H2011, etc.) — especially for behavioral health organizations billing Medicaid
HE Does NOT Apply When:
- The service is a substance use disorder treatment service → use HF
- You are in a general medical/primary care setting delivering integrated services (check your payer's policy — sometimes GT, GQ, or other modifiers apply instead)
- The payer explicitly states they do not use HCPCS behavioral health modifiers (this is rare, but some commercial payers fall into this category)
HE Modifier + Other Modifiers: Getting the Stack Right
One of the most common billing errors we see is providers either doubling up modifiers incorrectly or omitting required secondary modifiers when HE is in play. Here's how the most common combinations work:
HE + GT (Telehealth)
If you're delivering mental health services via telehealth and billing Medicaid or a Medicaid MCO, many states require both HE and GT on the same claim line.
Example:
90837 HE GT — 60-minute individual psychotherapy, mental health program, via telehealth
Check your state's Medicaid telehealth policy. As of 2026, most states have made pandemic-era telehealth flexibilities permanent for behavioral health, but modifier requirements vary.
HE + U-Series Modifiers (State-Specific)
Several states use U1–U9 modifiers to indicate provider type or credential level in their Medicaid billing systems. For example, a state might require U3 to indicate an LCSW billing under a behavioral health organization's NPI. In these cases, you may need a three-modifier stack:
90837 HE U3 — Therapist-level service, mental health program, LCSW credential designation
HE + 59 (Distinct Procedural Service)
When billing multiple services on the same date of service that might otherwise trigger a bundling edit, modifier 59 can be used to indicate distinct services. This is less common in pure outpatient therapy but comes up frequently in partial hospitalization programs (PHPs) and intensive outpatient programs (IOPs).
HE + HH (Integrated Programs)
If your program is formally designated as an integrated mental health and substance use disorder program, you should use HH, not HE. Using HE for a dually-licensed program can misrepresent the service context and create audit exposure.
Payer-by-Payer: Who Requires HE in 2026?
Here's a high-level overview of HE modifier requirements across major payer types:
| Payer Type | HE Modifier Required? | Notes |
|---|---|---|
| Fee-for-Service Medicaid | Usually Yes | Varies by state; check your state's billing manual |
| Medicaid MCOs (Centene, Molina, BCBS of various states, etc.) | Frequently Yes | Each MCO may have its own rules even within the same state |
| Medicare | Generally No | Medicare does not use HCPCS H-series behavioral health modifiers for standard outpatient billing |
| Commercial Insurance (BCBS, Aetna, Cigna, UHC) | Usually No | These payers typically do not require HE for standard behavioral health CPT codes |
| Tricare | Sometimes | Check current Tricare billing manual; requirements have evolved |
| Behavioral Health Organizations (BHOs) | Often Yes | BHOs acting as carve-out managers for Medicaid often mandate HE |
The bottom line: If you're billing Medicaid or a Medicaid MCO for outpatient behavioral health services, assume HE is required until you verify otherwise. For commercial payers, assume it's not required — but always confirm with a provider rep or the payer's online billing guide.
Documentation Requirements: What Needs to Be in the Chart
Appending HE to a claim isn't just a billing act — it's a representation to the payer that the service was delivered in the context of a mental health program. That means your clinical documentation needs to support it.
For a claim with HE to be audit-proof, your clinical record should include:
- A signed, dated intake/assessment that establishes a mental health diagnosis (DSM-5-TR or ICD-10-CM code — F-codes, not Z-codes alone)
- A treatment plan that identifies mental health goals, interventions, and expected duration
- Progress notes that document the content of the session, clinical observations, interventions used, and the patient's response
- Medical necessity language — your notes should make it obvious WHY this level of service, at this frequency, is clinically indicated for this patient
- A valid diagnosis in the appropriate ICD-10 range (F01–F99 for mental, behavioral, and neurodevelopmental disorders)
The Most Common Documentation Red Flags Auditors Look For:
- Progress notes that are copy-pasted or templated without individualization
- Missing or unsigned treatment plans
- Notes that describe supportive conversation without clinical intervention
- Diagnosis codes that don't match the documented clinical picture
- Session length that doesn't align with the billed CPT code
Common HE Modifier Billing Errors (And How to Avoid Them)
Let's get specific about the mistakes that generate denials, audits, and takebacks:
❌ Error 1: Using HE on Commercial Claims That Don't Require It
Some clearinghouses and billers reflexively append HE to every behavioral health claim. On commercial payers that don't recognize the modifier, this can trigger a claim rejection or be flagged as unusual billing.
Fix: Build payer-specific billing rules in your practice management system.
❌ Error 2: Missing HE on Medicaid Claims That Require It
The inverse problem — billing a clean claim to a Medicaid MCO without HE when it's required will result in a denial. The denial reason code might be vague ("claim not billable as submitted"), and providers sometimes waste weeks resubmitting without diagnosing the root cause.
Fix: Pull your state's Medicaid fee schedule and each MCO's provider manual annually and update your billing rules accordingly.
❌ Error 3: Using HE for Substance Use Disorder Services
If your practice delivers both mental health and SUD services, using HE for SUD sessions misrepresents the service type. This can create compliance exposure, especially under parity audits where payers examine whether MH and SUD claims are being correctly categorized.
Fix: Make sure your billing staff and clinical staff are aligned on program type before claims go out the door.
❌ Error 4: Stacking HE with Incompatible Modifiers
Adding HE alongside modifiers that contradict it (e.g., using HE and HF on the same claim line) will result in a claim rejection or, worse, a manual audit flag.
Fix: Audit your modifier stacking logic at least quarterly.
❌ Error 5: Not Updating Rules After Payer Policy Changes
Payer policies around modifier requirements change — often without broad announcement. MCOs update their billing manuals, state Medicaid programs issue new provider bulletins, and if you're not watching, you're billing on outdated rules.
Fix: Subscribe to your state Medicaid listserv, follow payer provider news, and schedule annual billing audits.
The 2026 Compliance Landscape: What's Changed
A few developments in 2026 that every behavioral health biller should be aware of:
- CMS's Medicaid Behavioral Health Coverage Rule (finalized 2024, implemented 2025–2026): Requires states to cover a broader set of behavioral health services and increases scrutiny on documentation and billing accuracy for those services. HE modifier compliance is directly implicated.
- No Surprises Act downstream effects: While primarily a cost-sharing law, NSA compliance has pushed payers to tighten claims auditing broadly, including behavioral health.
- Increased RAC and MIC audit activity: Recovery Audit Contractors are actively reviewing behavioral health claims, with a focus on Medicaid MCO billing. Modifier accuracy is a key review point.
- AI-driven claim scrubbing by payers: More payers are using algorithmic claim review, which means modifier errors that previously slipped through are now getting caught automatically at the clearinghouse level.
FAQ: HE Modifier Mental Health Billing
Q1: Do I need the HE modifier for Medicare behavioral health claims?
A: Generally, no. Medicare Part B does not require or recognize the HE modifier for standard outpatient behavioral health CPT codes (90791, 90837, etc.). Medicare uses its own modifier framework (e.g., GT for telehealth, GQ for asynchronous telehealth). Always verify with the current Medicare Claims Processing Manual, Chapter 9.
Q2: Can a solo private practice therapist use the HE modifier?
A: Yes, if you are credentialed with a Medicaid plan that requires it and you are delivering mental health services. "Mental Health Program" doesn't require you to be a large organization — it refers to the nature of the services, not the size of your practice.
Q3: What happens if I forget to add the HE modifier to a Medicaid claim?
A: Most likely, the claim will be denied. Depending on your state and MCO, you may be able to resubmit with the corrected modifier or file a corrected claim (CMS-1500 with billing type "7" or the electronic equivalent). Don't ignore denials — unpaid claims have timely filing limits, often 90–180 days from the date of service.
Q4: Is HE required for group therapy?
A: If you're billing group therapy (CPT 90853) to Medicaid or a Medicaid MCO that requires HE, then yes — the modifier should be appended to the group therapy code as well. The rule is about the payer's requirement and the service context, not the modality.
Q5: Do telehealth behavioral health claims need both HE and GT?
A: In many states, yes. When billing Medicaid for telehealth-delivered mental health services, you will often need to append both HE (mental health program) and GT (via interactive audio and video telecommunications system) on the same claim line. Some state Medicaid programs and MCOs have replaced GT with POS 02 (Telehealth Provided Other than in Patient's Home) or POS 10 (Telehealth Provided in Patient's Home) and may not require GT in addition. Check your specific state's telehealth billing guide.
Q6: What's the difference between HE and HK?
A: HE = Mental Health Program (general). HK = Specialized Mental Health Programs for High-Risk Populations. HK is used when serving populations such as individuals with serious mental illness (SMI), those with co-occurring disorders in a specialized program context, or other specifically designated high-risk groups. Most standard outpatient practices will use HE, not HK.
Q7: Can HE be used on UB-04 claims for facility billing?
A: Yes. HE and other HCPCS behavioral health modifiers can appear on both CMS-1500 (professional) and UB-04 (institutional/facility) claim forms. If you're billing for a PHP or IOP under a facility NPI, HE may be required on the UB-04 revenue code lines depending on your state Medicaid requirements.
Your Action Plan: HE Modifier Compliance Checklist for 2026
Use this as your quick reference before your next billing cycle:
- Identify all payers you bill and confirm whether HE is required for each
- Update your practice management system with payer-specific modifier rules
- Confirm that your billing staff can distinguish MH (HE), SUD (HF), and integrated (HH) program types
- Audit 20–30 recent claims per payer to check modifier accuracy
- Review your clinical documentation templates to ensure they support medical necessity and program type
- Subscribe to your state Medicaid provider bulletin listserv
- Schedule a billing audit for Q2 2026 to catch any policy changes from Q1
How Mozu Health Helps You Get This Right — Every Time
Billing modifiers like HE are exactly the kind of detail that falls through the cracks in a busy practice. You're focused on your patients. Your billing staff is juggling dozens of payers. And one wrong modifier on a thousand claims can translate into five- or six-figure recoupments.
Mozu Health is the AI-powered clinical documentation platform built specifically for behavioral health providers. Here's how it keeps your HE modifier usage — and your entire billing workflow — airtight:
- Smart documentation prompts that align your clinical notes with billed CPT codes and modifiers, so your chart always supports what you're billing
- Payer-aware billing rules that flag when HE (or other modifiers) are required or contraindicated based on the payer on the claim
- Audit-ready records that are HIPAA-compliant, timestamped, and structured to withstand RAC, MIC, or MCO audits
- Real-time compliance checks that catch mismatched diagnoses, missing treatment plans, and modifier errors before claims go out the door
- Built for therapists, LPCs, LCSWs, LMFTs, and psychiatrists — not retrofitted from a medical billing platform
Whether you're a solo practitioner billing Medicaid for the first time or a group practice managing 20 clinicians across multiple payer contracts, Mozu Health gives you the documentation infrastructure to bill confidently and compliantly.
Ready to stop leaving money on the table — and stop worrying about audits?
👉 Try Mozu Health free at mozuhealth.com and see how AI-powered documentation can transform your billing accuracy in 2026.
Disclaimer: This guide is for informational and educational purposes only and does not constitute legal, medical, or billing compliance advice. Always verify modifier requirements directly with your payers and consult a qualified healthcare billing compliance professional for guidance specific to your practice.
