Telehealth Billing Guide: CPT Codes, Modifiers, and Payer Rules

Billing mistakes are the most expensive problem in a new telehealth practice. One wrong modifier or place of service code means a denied claim, and most providers do not catch it until weeks later. This guide covers the CPT codes, modifiers, and payer-specific rules you need to bill telehealth services correctly from your first claim.

Telehealth CPT codes for behavioral health

These are the most commonly billed codes for therapists, counselors, psychologists, and psychiatrists providing telehealth services:

Place of Service codes

The Place of Service (POS) code tells the payer where the service was delivered. For telehealth, two codes matter:

• POS 10: Telehealth provided in patient's home. This is the most common POS for outpatient telehealth.
• POS 02: Telehealth provided to patient at a clinical site (e.g., patient is at a hospital or clinic connecting via video). Less common for solo practices.

Using the wrong POS code is one of the top denial reasons for telehealth claims. Most solo telehealth providers should default to POS 10 unless the patient is connecting from a clinical facility.

Modifiers for telehealth claims

Modifiers are two-digit codes appended to the CPT code to provide additional context. For telehealth, you will encounter these:

• Modifier 95: Synchronous telemedicine service rendered via real-time audio/video. This is the standard modifier for live video telehealth visits. Used by most commercial payers.
• Modifier GT: Via interactive audio and video telecommunications systems. Some older payer systems still require GT instead of 95. Check each payer's billing guide.
• Modifier FQ: Telehealth service provided using audio-only. Required for audio-only (phone) sessions where permitted.

Medicare telehealth billing rules

Medicare has specific telehealth billing requirements that differ from commercial payers:

• Use POS 10 for telehealth services delivered to the patient's home
• Modifier 95 is required on all synchronous telehealth claims
• Audio-only visits (modifier FQ) are permitted for behavioral health services for established patients
• The originating site facility fee is not applicable when the patient is at home
• Medicare reimburses telehealth at the same rate as in-person for most behavioral health codes

Commercial payer differences

Every commercial payer has slightly different telehealth billing rules. The differences usually come down to three things:

• Which modifier to use (95 vs GT)
• Whether audio-only visits are covered
• Whether telehealth reimbursement matches in-person rates

Check each payer's provider manual for their current telehealth policy. These policies change at least annually, and some payers update mid-year. When in doubt, call the payer's provider services line and ask for their telehealth billing requirements in writing.

Top 5 telehealth billing mistakes that cause denials

1. Wrong Place of Service code. Using POS 11 (office) instead of POS 10 (patient's home) for a telehealth visit.
2. Missing telehealth modifier. Submitting the claim without modifier 95 or GT. The payer sees it as an in-office visit and denies it because you billed from home.
3. Billing for a code not approved for telehealth. Not all CPT codes are eligible for telehealth delivery. Check the payer's approved telehealth code list.
4. Time documentation does not match the code. Billing 90837 (60 min) for a 30-minute session. Payers audit these.
5. Not verifying patient eligibility before the session. The patient's plan changed, or they hit their visit limit. Run an eligibility check before every appointment.

How to set up clean billing from day one

The best way to avoid billing problems is to build the right process before your first claim:

• Configure your EHR with the correct POS codes and modifiers as defaults for telehealth appointments
• Create a payer reference sheet with modifier requirements for each payer you accept
• Run eligibility verification on every patient at least 24 hours before their appointment
• Review every claim before submission. A 30-second visual check catches most errors.
• Track denial reasons in a log so you can spot patterns and fix systemic issues