Key Takeaways
- Telehealth and in-office mental health visits require different place-of-service codes, and submitting the wrong one is one of the most common sources of avoidable denials.
- Modifier requirements vary by payer — and modifier rules for audio-video telehealth have shifted over time, so assumptions based on older workflows may no longer be accurate.
- Documentation standards are stricter for telehealth claims and must include platform type, patient location, and consent confirmation to support medical necessity.
- Telehealth parity laws vary by state, which means reimbursement rates for virtual sessions are not uniform — and assuming they are leads to underpayment and missed appeals.
- Many practices use identical billing workflows for in-office and virtual visits, creating an error pattern that compounds across hundreds of claims before anyone notices.
Mental health practices expanded their telehealth offerings quickly during the pandemic, and most have kept them. The billing, in many cases, did not keep pace. Telehealth and in-office visits deliver the same clinical service, but place-of-service codes, modifiers, documentation requirements, and reimbursement rates all shift when a session moves from the office to a screen — and practices that apply the same billing logic to both settings generate a predictable set of errors.
What makes this particularly costly is how long it takes to surface. Telehealth billing errors often pay through initially and get caught in retrospective audits, or they show up as chronic underpayment that nobody investigates because the claims technically processed. By then the pattern has repeated across hundreds of sessions — particularly for practices that have expanded their mental health billing operations to include virtual care.
This post covers the specific billing distinctions between in-office and telehealth mental health services, where practices most often go wrong, and what it takes to close the gap.
Place-of-Service Codes: The First Place Things Go Wrong
Every claim includes a place-of-service (POS) code that tells the payer where the service was rendered. For in-office mental health visits, that is POS 11. Telehealth requires a different code — and which one depends on where the patient is sitting.
Medicare uses POS 10 when the patient is at home, which covers the large majority of outpatient mental health telehealth visits. POS 02 applies when the patient is at a different qualifying telehealth location. Many commercial payers have adopted a similar framework, but not uniformly — some follow Medicare conventions, others have their own rules. Submitting POS 11 on a telehealth claim, which happens when the billing system defaults to the provider’s office setting, can result in denial or payment at an unintended rate.
This particular error tends to be invisible until it accumulates. A session note is entered, a charge is posted, and the POS pulls from whatever default is configured for that provider. If no one is actively reviewing whether each session was telehealth or in-office before claims go out, the wrong code ships on a consistent share of the volume.
Modifiers: A Payer-By-Payer Problem
Telehealth mental health claims often require a modifier to identify the mode of delivery, but which modifier — and whether one is required at all — depends on the payer. The two most commonly referenced are modifier 95 (synchronous audio and video telehealth) and GT (interactive audio and video), and different payers handle them differently. Some commercial payers require one or the other; some require neither. Medicare’s own modifier requirements for audio-video telehealth have also shifted over time, and practices operating on older assumptions about what is required may be submitting incorrectly.
Audio-only sessions introduce a separate track. Where payer contracts or state telehealth laws cover audio-only mental health visits — particularly for patients without reliable video access — the billing requirements differ from video-based telehealth. For Medicare, audio-only telehealth is billed with modifier 93. Commercial payer treatment of audio-only varies significantly and has to be verified plan by plan.
A practice billing across Medicare, Medicaid, and several commercial plans is effectively managing multiple independent modifier configurations at the same time. Errors in any one of them generate denial patterns that can run for months before anyone connects them to a modifier issue — especially if telehealth claims are not being tracked separately from in-office submissions.
Quick Reference: In-Office Vs. Telehealth Billing At a Glance
| Billing Element | In-Office | Telehealth |
| Place of Service Code | 11 (Office) | 02 (Telehealth) or 10 (Patient Home) |
| Modifier | None required for standard visit | 95, GT, or none — varies by payer |
| Audio-Only | N/A | Modifier 93 (Medicare); payer-specific for commercial plans |
| Documentation Req. | Standard note with time/session details | Platform used, patient location, consent, audio/video confirmation |
| Reimbursement Rate | Standard contracted rate | Parity law varies by state — may differ from in-office |
Note: Commercial payer requirements vary. Always verify modifier and POS rules by payer before submitting.
Documentation: What Telehealth Claims Actually Need
Telehealth claims face higher scrutiny in medical necessity reviews than in-office claims, and the documentation standard reflects that. A standard therapy note — the kind that would comfortably support an in-office claim — often leaves a telehealth claim exposed.
Payers reviewing telehealth mental health claims typically expect the record to include:
- The telehealth platform used, and confirmation that it met applicable privacy and security requirements
- The patient’s location at the time of the session (city and state at minimum; some payers require a specific address)
- Documentation of patient consent to receive services via telehealth
- Whether the session was conducted via audio and video, or audio only — and if audio only, the clinical rationale
Gaps in these elements do not always produce immediate denials. A claim can process and pay, then surface in a retrospective audit months later. At that point the documentation gap typically spans far more sessions than just the one under review, and the recoupment exposure is proportionally larger.
Telehealth Parity Laws: Reimbursement Varies More Than Most Practices Realize
Telehealth parity laws require insurers to cover telehealth services on the same terms as in-person care, but coverage parity and payment parity are different things. Some states require that reimbursement rates for telehealth visits match in-office rates. Others mandate coverage without addressing what the payer actually has to pay. The distinction matters significantly for a practice trying to project telehealth revenue.
Practices billing patients across multiple states — or carrying a payer mix that spans both regulated and unregulated plans — may be receiving telehealth reimbursement below contracted rates without realizing it. Underpayment on telehealth claims tends to go uncontested because practices often lack a process for comparing telehealth remittances against what they should have received.
This is compounded for practices that expanded access to patients in states where they are licensed but not headquartered. Cross-state telehealth billing adds both licensure considerations and a second layer of payer-specific rules that can shift independently of what applies in the practice’s home state.
How the Errors Stack
None of the issues above is catastrophic on its own. The problem is that they tend to occur together, and because mental health practices bill high volumes of structurally similar claims — therapy sessions of comparable length, delivered by the same handful of providers — a systematic telehealth billing error scales quickly. Wrong POS code, missing modifier, thin documentation, and no process to audit reimbursement rates can all be happening at once, on every telehealth claim, for months.
Denial patterns are sometimes the thing that finally surfaces the issue, but not always. Underpayment without denial is harder to catch and easier to overlook. If telehealth and in-office claims run through the same reporting bucket, there is no baseline to compare against. The revenue loss just blends into the aggregate numbers.
Practices that stay ahead of this tend to share a few habits: they track telehealth claims separately, audit reimbursements against contracted rates on a regular schedule, and review payer-specific telehealth requirements at least annually when contracts renew. None of that is technically complex, but it needs to be someone’s job.
How PGM Supports Telehealth Billing for Mental Health Practices
PGM Billing’s behavioral health billing team runs telehealth and in-office claims through separate workflows, with payer-specific modifier and POS configurations maintained as a standing part of the process. We verify telehealth requirements by payer at enrollment and update configurations when policies change — so the right codes go out without your team having to track regulatory updates across every plan you contract with.
We also monitor telehealth remittances for underpayment and manage appeals where reimbursement falls below contracted rates, including in states with telehealth payment parity obligations. If your practice has grown its telehealth volume and you are not confident your billing reflects how the rules have evolved, that is worth a conversation.
Contact the PGM team to talk through your behavioral health billing setup.
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FAQs About Telehealth Mental Health Billing
Do telehealth mental health visits use the same CPT codes as in-office sessions?
Yes — the CPT codes for psychotherapy and psychiatric services (such as 90834, 90837, 90791, and 90792) are the same for telehealth and in-office visits. The difference is in the place-of-service code and modifiers attached to the claim, not the procedure code itself.
What place-of-service code should be used for telehealth mental health sessions?
For Medicare, POS 10 is used when the patient is at home (which covers most outpatient telehealth mental health visits), and POS 02 is used for other telehealth locations. Commercial payer requirements vary — some follow Medicare conventions while others have their own rules. Always verify by payer before submitting.
Is modifier 95 or GT required for telehealth mental health claims?
It depends on the payer. Modifier 95 and GT both apply to synchronous audio-video telehealth, but payer requirements differ — some require one, some the other, and some require neither. Medicare’s own modifier requirements for audio-video telehealth have evolved and vary by claim type, so it is worth verifying current requirements directly rather than assuming a rule that applied previously still holds. For audio-only services billed to Medicare, modifier 93 is used.
Do telehealth mental health visits require different documentation than in-office sessions?
Yes. Telehealth claims face more documentation scrutiny than in-office claims and typically need to include the platform used, the patient’s location at the time of the session, consent documentation, and confirmation of audio/video delivery. A standard in-office therapy note that omits these elements can leave a telehealth claim vulnerable to denial or recoupment in a retrospective audit.
Can audio-only mental health sessions be billed as telehealth?
In some cases, yes. Medicare permanently covers certain audio-only behavioral health telehealth services for patients at home — billed with modifier 93 — when the provider has audio-video capability available but the patient cannot use or does not consent to video. Commercial payer coverage for audio-only varies significantly by plan and state, and documentation requirements for audio-only sessions are typically stricter than for audio-video visits. The clinical rationale for audio-only delivery should be noted in the record.
What does telehealth parity mean for mental health billing?
Telehealth parity laws require insurers to cover telehealth services under the same terms as in-person services, but the specifics vary by state. Some states mandate equal reimbursement rates; others only require coverage without addressing payment levels. Practices billing across multiple states need to understand the parity rules that apply in each jurisdiction to identify and contest underpayment.
How can my practice tell if telehealth claims are being underpaid?
The most reliable method is comparing remittance amounts against contracted rates on a regular basis, with telehealth claims reviewed as a separate category from in-office claims. When the two are grouped together in reporting, underpayment on telehealth tends to disappear into the aggregate. Isolating telehealth remittances gives you a baseline to measure against and makes systematic underpayment visible.
Should mental health practices use a separate billing workflow for telehealth?
Yes, and most that have tried to run both through the same workflow have found out why. Telehealth claims require different POS codes, modifiers, and documentation than in-office claims, and the specific requirements vary by payer. A dedicated telehealth workflow with payer-specific configurations reduces errors at submission and makes it much easier to spot denial patterns when they appear.