A telehealth session billed without the modifier that payer wants is a clean denial.
Clean, meaning nothing was wrong with the session, the documentation, or the code. One small field was missing, so the claim was refused.
Here is the part that catches people. Payers do not all want the same thing, and they change what they want.
Why there is no single right answer
One payer wants a particular modifier. Another wants a specific place of service code. Some want both, and a few have their own rules that match nobody else's.
The guidance also moved more than once in recent years, which means the answer somebody posted in a therapist forum two years ago is not automatically the answer today. Neither is the thing your colleague in another state does, because plan rules vary by state and by the specific product within a payer.
This is not a fact to memorise. It is a lookup to maintain.
The pieces you are choosing between
Without pretending any of these is universal, here is the vocabulary so the provider manual makes sense when you open it.
Modifiers are two character additions to the CPT code. The telehealth ones in general use distinguish between a session delivered by real time video and one delivered by audio only. Which one a payer wants, and whether it wants one at all, is payer specific.
Place of service codes describe where the service happened. Telehealth has its own codes, and there is a distinction between the client being at home and the client being somewhere else. Some payers use this instead of a modifier, some alongside it.
Audio only is its own category. Coverage for telephone sessions differs from video, sometimes substantially, and sometimes it is not covered at all. If you ever see clients by phone, check this separately rather than assuming it rides along with video coverage.
The thing to take from that list is not a set of codes. It is that there are three independent variables and each payer sets them differently.
The one page
Make a table. One row per payer, five columns:
Payer · telehealth modifier · place of service code · audio only covered · date verified
Fill it from the provider manual, which is usually a PDF in the portal. Search it for "telehealth." If the manual is unclear, email provider relations and ask in writing, because a written answer is something you can point at later.
Review it once a year, and any time a telehealth claim is denied without an obvious cause.
How to tell this is your problem
The signature is denials that cluster with one payer while everything else pays fine.
If your in person claims go through and your telehealth claims from the same payer come back, or if one payer denies what four others accept, this is almost always the reason. It is rarely the whole book of business, which is why it can run for months before anyone notices.
Pull your last three months of denials and sort them by payer. The pattern will be obvious in about five minutes.
Documentation, separately
Getting paid and staying compliant are two different jobs, and the modifier only handles the first.
Your note should make clear that the session was delivered by telehealth, which platform or modality, where the client was located, and that you confirmed it. Location matters because your licence generally has to match where the client sits at the time of the session, not where they usually live and not where you are.
That last point catches people every summer, when a client takes a session from a holiday in another state.
Do this today
Pick the payer you bill most telehealth to. Open its provider manual. Find the telehealth section.
Write down the modifier, the place of service code, and today's date. One row. The rest of the table can wait for a quieter week.
Start here, free. The Credentialing Timeline covers every stage of getting paneled, with realistic waits. Get it free at craftyourpractice.com/start
Go deeper. Get Paid is the full course on the insurance side of practice, from clean claim through appeal. See the course
The one guide for this. The Telehealth Compliance Checklist covers what to verify per payer, what belongs in the note, and the location rules that decide whether a session was billable at all. $37, one payment, yours forever. Open it in The Practice Library