Telehealth Modifiers for Behavioral Health Practices: A Plain-Language Guide

What Is a Telehealth Modifier and Why Does Getting It Wrong Cost You?

A telehealth modifier is a two-character code appended to a CPT code that communicates to payers the method of service delivery: real-time video, phone-only, or another format. Incorrect modifiers trigger denials that demand manual rework. This is one of several structural reasons insurance billing for mental health carries a significantly higher denial rate than general medical billing.

Two primary denial codes emerge frequently:

• CO 4: "Procedure code inconsistent with modifier or provider type" — the modifier exists but is incorrect. Learn more about the CO-4 denial code and how to respond to it.
• CO 197: "Payment denied due to absence of modifier indicating telehealth" — no modifier was included.

Both require manual follow-up.¹ For behavioral health practices where telehealth represents a substantial portion of caseloads, systemic modifier errors affect dozens of claims simultaneously until identified and corrected. This is why monitoring your clean claim rate is an important leading indicator — a sudden drop often points to a modifier or POS issue.

Modifier 95 vs. GT: Does Your Payer Even Require One?

Prior to the pandemic, most payers mandated telehealth modifiers on all claims. This landscape has shifted considerably. Today, the majority no longer require GT or 95. What matters more is the Place of Service code.

CMS separated the former POS 02 into two categories:

• POS 02: Telehealth delivered outside the patient's home
• POS 10: Telehealth provided in the patient's home

Most payers adopted this distinction. Correct POS has become the primary determinant of clean telehealth claims.² However, certain payers still mandate modifiers. Verification of each payer's specific requirements remains essential — this is a core function of revenue cycle management for telehealth-heavy practices.

Audio-Only Telehealth Has Its Own Modifiers: Modifier 93 and FQ Explained

Not all telehealth sessions involve video. Phone-only appointments require distinct modifiers.

Modifier 93 designates audio-only telehealth on non-Medicare claims when the session occurs entirely by telephone without video.

Modifier FQ is Medicare's designated modifier for audio-only behavioral health telehealth. CMS requires it on phone-only Medicare sessions.

Documentation requirement for FQ claims: the clinical record should note whether the patient declined video or lacked necessary technology. This protects claim integrity.

Medicare now covers audio-only behavioral health telehealth permanently as of 2026, making phone-only sessions a sustainable billing option rather than a temporary accommodation. For a full picture of Medicare's telehealth policy evolution, see our post on Medicare telehealth updates.

POS 02 vs. POS 10: Why the Place of Service Code Matters for Telehealth Claims

Telehealth modifiers operate in conjunction with Place of Service codes. Incorrect POS creates denials independent of modifier accuracy.

POS 02 applies when the patient receives services from a location other than their home — a hospital, clinic, or facility.

POS 10 applies when the patient is at home. This code covers most behavioral health video sessions where clients connect from residential settings.

Critical principle: POS reflects patient location, not provider location. A therapist billing from their office for a client at home should use POS 10.

The 2026 Telehealth Update: What's Now Permanent for Behavioral Health

Behavioral health emerged favorably from 2026 telehealth policy revisions. Several changes now have permanent status:

Permanent Medicare coverage for behavioral health includes:³

• No geographic restrictions on patient location
• Home-based telehealth access for patients
• Audio-only sessions when video is unavailable or declined

Extended through December 31, 2026 (with renewal potential): expanded behavioral health telehealth access that emerged during the pandemic emergency period. Congress has repeatedly renewed these provisions, consistently favoring behavioral health over other specialties.

Practical implications: pandemic-era coding workarounds are obsolete. Practices can establish stable, repeatable telehealth billing processes rather than adjusting protocols repeatedly.

Important caveat: Medicare policies do not automatically extend to state Medicaid programs or commercial plans. Each establishes independent telehealth policies. Plan-specific verification remains necessary, particularly for Medicaid in Minnesota and Illinois. Medicaid payer policy changes can shift telehealth coverage rules with limited advance notice, making ongoing monitoring essential.

Final Thoughts

Telehealth billing complexity stems not from difficult individual rules but from payer-specific variations and ongoing regulatory shifts. Maintaining current policies across all payer relationships represents substantial administrative burden that typically diverts practice leadership from clinical operations.

When telehealth denials appear inexplicable, a modifier or POS code error typically underlies the issue. Professional behavioral health billing support addresses these challenges systematically. If you're ready to reduce telehealth-related denials, reach out for a free assessment.

Footnotes

1. 9 Common Errors in Using Modifiers for Mental Health Visits — My First Choice Billing, 2024

2. Telehealth Billing Quick Reference Guide — Optum Behavioral Health Solutions, 2023

3. Psychiatry and Behavioral Health in 2026: Critical Billing Updates and Long-Term Telehealth Stability — ADSC, 2026