Place of Service Codes: What Billers Need to Know

Every claim answers three basic questions: who, what, and where. The "where" is the place of service code — two digits that tell the payer the setting of the encounter. Get it right and it's invisible. Get it wrong and the claim denies, or worse, pays at the wrong rate and nobody notices.

The POS codes you'll use most

Code	Setting	Notes
11	Office	The classic physician office visit — non-facility payment
19	Off-campus outpatient hospital	Facility payment; site-neutral payment rules may apply
22	On-campus outpatient hospital	Facility payment
24	Ambulatory surgical center	ASC facility payment rules
31	Skilled nursing facility	Patient in a SNF bed
32	Nursing facility	Long-term care setting
81	Independent laboratory	Freestanding lab services
02 / 10	Telehealth	02: patient not at home; 10: patient at home (Medicare)

This isn't the full list — CMS maintains the complete POS code set — but these cover the vast majority of professional claims.

Where was the patient seen?

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Match the setting to the POS code

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Check facility vs non-facility payment

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Submit — POS errors are preventable denials

Why POS changes the payment

Medicare (and many commercial payers following its lead) pays a facility rate vs. a non-facility rate for the same CPT code. The logic: when the physician works in a facility, the facility bears overhead costs and bills separately; in a non-facility setting like an office, the physician bears them. Same procedure, different POS, different payment — sometimes substantially.

That makes POS accuracy a revenue issue, not just a compliance checkbox. Systematically coding POS 22 where POS 11 belongs (or vice versa) either leaves money on the table or creates overpayment liability.

Common POS denials

POS inconsistent with the procedure: a surgical code billed with POS 11, or an office visit with POS 24. Payer edits catch these instantly.
POS doesn't match the facility claim: when both a professional and facility claim exist for an encounter, mismatched POS codes trigger reviews.
Telehealth POS errors: using the wrong telehealth POS (02 vs. 10) or billing telehealth with an in-person POS. Payer telehealth rules are still evolving — verify per payer.
Site-of-service shifts: a practice moves locations (office to hospital outpatient department, for instance) and the billing system keeps sending the old POS. Every claim is wrong until someone updates the default.

Illustration of different healthcare facility settings

Getting POS right systematically

Default POS by location in the PM system — but review defaults whenever a provider adds a new practice location. Stale defaults are the #1 source of POS errors.
Scrub for POS-procedure mismatches before submission. This is exactly what claim scrubbing is for — a rules check catches an impossible POS/code combination in seconds.
Reconcile professional and facility POS for encounters that generate both claim types.
Track POS denials as a category in your denial KPIs. A spike usually means a location or default changed, not that coders forgot the codes.

Pair POS discipline with modifier discipline — the two most common coding-level denial sources — and a large share of preventable denials disappears before submission.

Frequently asked questions

What is a place of service code?

A place of service (POS) code is a two-digit code on every claim indicating where the service was performed — e.g., 11 for office, 22 for on-campus outpatient hospital, 24 for ambulatory surgical center. CMS maintains the official code set.

Does place of service affect how much a claim pays?

Yes. Medicare pays facility vs. non-facility rates for the same CPT code depending on POS — the same procedure can pay differently in an office (POS 11) versus a hospital outpatient department (POS 22), because overhead costs fall on different parties.

What are POS codes 02 and 10?

They're Medicare's telehealth place of service codes: 02 indicates telehealth when the patient is not at home, 10 indicates telehealth when the patient is at home. Using the wrong one — or an in-person POS for telehealth — is a common denial trigger.

Why do my claims keep denying for place of service?

The most common causes are stale location defaults in the billing system (especially after a site-of-service change), POS codes inconsistent with the procedure performed, and mismatches between professional and facility claims for the same encounter.

Where do I find the official POS code list?

CMS publishes and maintains the complete place of service code set. Check the CMS website for the current list, since codes are occasionally added or revised.