POS 02 vs POS 10 (and Modifiers 95 vs 93): Telehealth Billing, Decoded

The claim came back paid. That's what makes this one sneaky — there's no denial to argue with, no rejection letter to wave around. Just a payment that's $18 lighter than the exact same session was when the client sat on your office couch, and nobody at the payer is going to call and explain why. The answer is two characters in box 24B of the claim form: you billed place of service 02 when you should have billed 10. Do that once and it's trivia. Do it on every telehealth session for a year and it's a slow leak below the waterline — hundreds or thousands of dollars gone, one quiet claim at a time.

Here's the rule that covers most of teletherapy in one sentence: client at home, on video, with you anywhere — that's POS 10 plus modifier 95. For most therapists that combination describes 90% of telehealth sessions. The rest of this post is about the other 10%, the money mechanics underneath, and how to make the right claim happen automatically.

The three codes that matter

Place of service tells the payer where the client was — not where you were. You can be in your office, your spare bedroom, or a rented cabin with good Wi-Fi; the POS code follows the client. For a therapy practice, only three codes come up:

A little history explains the confusion. For years, POS 02 was the only telehealth code — every virtual session got it, wherever the client sat. Then in January 2022, CMS split the code in two and created POS 10 specifically for "patient at home." Why bother? Because payment systems treat the client's location as a proxy for overhead, and a client's living room is not a clinic. That split is the whole story: two codes that sound interchangeable, drawn along a line — home versus not-home — that happens to have money attached to it. Plenty of therapists set up their billing before 2022 and never revisited it, which is how a practice ends up billing POS 02 for four years of living-room sessions without anyone noticing.

The money mechanics: why 02 quietly costs you

Medicare pays most services at one of two rates: a non-facility rate (the full office rate, because you're absorbing all the overhead) and a lower facility rate (because a hospital or clinic is absorbing some of it and billing separately). Here's the part that matters to your bank account: under Medicare, POS 10 pays the non-facility rate — the same as an in-person office visit — while POS 02 pays the lower facility rate. Depending on the code, that gap commonly runs 10–25%. On a $150 session, that's real money. Multiply by a caseload that's half telehealth and you're looking at the price of a nice vacation, donated annually to a payer that never asked for it.

Commercial payers are less uniform, but many follow Medicare's methodology — and any contract that references the Medicare fee schedule inherits the same gap. Some commercial plans pay 02 and 10 identically; you won't know which kind you have until you read your fee schedule or run the experiment. So here's the honest version of the advice, and it's the same advice for every payer-specific question in billing: the payer's provider manual and your contract win. Everything in this post is the prevailing pattern; your contract is the tide table for your particular harbor. If your telehealth payments look lighter than your in-person payments for the same code, pull an EOB and look at box 24B before you assume the payer cut your rate.

One more thing worth saying plainly: this isn't about gaming anything. If the client genuinely wasn't home — they took the session from their parked car outside work, which happens more than any of us would like — POS 02 is the accurate code and you bill it. The point isn't "always bill 10." The point is: bill where the client actually was, and know that the answer is usually "home," which usually pays better. Accuracy and the higher rate travel together most of the time. That's a rare kindness in insurance billing; take it.

Modifier 95 vs modifier 93: video or voice

If place of service says where the client was, the modifier says how you reached them:

Audio-only is not a lesser cousin here — for behavioral health it's a legitimate, recognized modality. Medicare permanently allows audio-only for mental health services to a client at home, with conditions worth knowing: you must be capable of doing video (your setup works), and the client either can't use video or doesn't consent to it. Rural bandwidth that drops every third sentence, a client whose only device is a flip phone, an 80-year-old who can do a phone call but not an app — all legitimate. Many commercial payers cover audio-only for behavioral health too, though coverage and rates vary more than for video; check the manual.

The habit that keeps modifier 93 safe is a one-line note about why:

• "Client's video connection failed; session completed by phone with client's agreement."
• "Client does not have a video-capable device; audio-only per client preference."
• And bill what actually happened. If the video died ten minutes in and you did the other forty by phone, that session's story is audio-only — the modifier should say 93, and the note should match.

The consistency trap

Underpayment is the small risk. The bigger one is a claim and a note that tell different stories. Your progress note says "telehealth session, client at home" and the claim says POS 11 — office. Or the note says "session conducted by phone" and the claim carries modifier 95, swearing there was video. Each mismatch is small. But an auditor reading a chart is a person looking for a loose thread, and a documented location that contradicts the billed location is exactly that thread — pull it, and suddenly every telehealth claim you've filed is worth a second look.

The fix costs one sentence per note: "Session conducted via secure video; client in their home; this writer at the office." We covered the full telehealth note recipe — consent, location, emergency contact, technology — in our telehealth documentation guide, and the general principle that notes should be written to survive a records request in insurance-ready documentation. And remember the claim has other boxes that must also agree with the note: the CPT code still has to match the session length (90837 vs 90834 is its own decision), and the whole thing rides the same pipeline we walked through in therapy billing, explained.

Set it once, then stop deciding

Here's the uncomfortable truth about everything above: you will not reliably remember it at 5pm on a Thursday, seven sessions deep. Nobody does. Billing rules that depend on per-claim recall fail exactly as often as you'd expect, which is why the real solution isn't memorization — it's rigging the boat so the right claim is the one that happens when you're not paying attention.

Concretely, that means per-location defaults in your EHR. Your office location carries POS 11. Your telehealth "location" carries POS 10 and modifier 95. When you schedule a telehealth appointment, the claim inherits both — no box to remember, no 24B to second-guess. The exceptions (client not at home, audio-only session) become deliberate one-off edits with a note to match, instead of the default being whatever you last typed. Practice Harbor does exactly this: telehealth appointments default to POS 10, and the right telehealth modifiers are applied automatically per payer when the claim is built — so the correct claim is also the lazy one. Set your heading once, at the dock, in daylight; don't re-derive it in every squall.

One afternoon of setup, and the $18-lighter payment stops happening — not because you got more vigilant, but because vigilance stopped being required.