Place of service codes are standardized two-digit identifiers on professional healthcare claims that tell payers where a service was delivered — and that setting directly controls reimbursement rates, claim adjudication rules, and audit exposure.
CMS maintains the official POS code set used on the CMS-1500 form (formerly HCFA-1500) and 837P electronic claims, and payers rely on these codes to calculate facility versus non-facility payment amounts.
A mismatched POS code can trigger a denial, reduce payment, or flag a claim for review — problems that compound quickly across a full billing cycle. Below, this guide covers:
- Facility vs non-facility reimbursement and why it changes your payment
- POS 02 vs POS 10 telehealth rules after CMS’s 2024 changes
- The most common POS codes (with denial triggers for each)
- Audit risks and specialty-specific billing considerations
- How to choose the correct code for each claim
How do facility and non-facility POS codes affect reimbursement?
The single biggest financial impact of POS coding is whether a service falls under facility or non-facility payment rules.
CMS assigns each POS code to one of these two categories, and the Medicare Physician Fee Schedule (MPFS) uses separate RVU values for each.
Non-facility settings (physician offices, independent clinics, patient homes) carry higher practice expense RVUs because the provider absorbs overhead — staff, equipment, supplies.
Facility settings (hospitals, ASCs, SNFs) carry lower practice expense RVUs because the institution bills separately for those resources.
In practice, this means a physician performing the same procedure in their office versus a hospital outpatient department can see a 20–50% difference in Medicare reimbursement, depending on the CPT code and its practice expense component.
The following table breaks down how CMS categorizes common POS codes and the reimbursement impact.
| POS code | Setting | Facility or non-facility | Reimbursement effect |
| 11 | Office | Non-facility | Higher physician payment (full practice expense RVUs) |
| 22 | On-campus outpatient hospital | Facility | Lower physician payment (hospital bills facility fee separately) |
| 24 | Ambulatory surgical center | Facility | Lower physician payment (ASC bills facility fee) |
| 10 | Telehealth — patient’s home | Non-facility | Higher reimbursement (CMS 2024 policy) |
| 02 | Telehealth — other than home | Facility | Lower reimbursement |
| 21 | Inpatient hospital | Facility | Lower physician payment |
| 12 | Home | Non-facility | Higher physician payment |
Here’s a sum up:
For most practices, the operational risk here isn’t deliberate miscoding — it’s habitual defaults.
A billing team accustomed to entering POS 11 for everything may not switch to POS 22 when a provider starts seeing patients at a hospital-based clinic, and the payer will either deny the claim or recoup the overpayment on audit.
Which place of service codes are most common?
The following place of service codes list covers the settings that appear on the majority of professional claims. Each entry includes the CMS definition, common billing context, and the denial trigger most frequently tied to that code.
POS 11 — Office
CMS defines place of service code 11 as a location (other than a hospital, SNF, military treatment facility, community health center, State or local public health clinic, or intermediate care facility) where the provider regularly furnishes health services.
For most physician practices, POS 11 is the default.
The common mistake is using POS 11 for services rendered at a hospital-owned clinic — which should be POS 22 or POS 19 depending on campus location.
POS 21 — Inpatient hospital
Used when a patient has been formally admitted.
The denial trigger here is billing POS 21 when the patient is on observation status (which should use POS 22), a confusion that generates a high volume of Medicare recoupments.
POS 22 — On-campus outpatient hospital
Applies to hospital outpatient departments located on the main campus.
Physicians working in hospital-employed settings should verify whether their clinic qualifies as on-campus (POS 22) or off-campus (POS 19), since CMS applies different payment rules to each under Section 603 of the Bipartisan Budget Act.
POS 23 — Emergency room
For services delivered in an emergency department. Billing E/M codes with POS 20 (urgent care) instead of POS 23 — or vice versa — is a frequent mismatch that triggers claim edits.
POS 24 — Ambulatory surgical center
For procedures performed in an outpatient surgical facility. ASC claims billed with POS 11 (office) are a classic audit flag because the reimbursement difference is substantial and payers specifically screen for this pattern.
POS 31 — Skilled nursing facility
For services rendered in an SNF. Do not confuse with POS 32 (nursing facility), which is for custodial or intermediate-level care — a coding error that affects Medicare Part A vs Part B billing logic.
POS 12 — Home
For services provided at the patient’s residence (not telehealth). Home health visits, home infusion, and house calls use POS 12. Telehealth delivered to a patient at home now uses POS 10 — not POS 12.
POS 49 — Independent clinic
For standalone outpatient clinics not affiliated with a hospital. Practices that operate both an independent clinic and a hospital-based location need clear workflows to prevent cross-contamination between POS 49 and POS 22.
POS 20 — Urgent care facility
For walk-in care centers. The coding risk is conflation with POS 23 (ER) for patients presenting with similar complaints at different facility types.
POS 50 — Federally qualified health center
For FQHCs, which operate under their own prospective payment system. POS 50 claims follow FQHC-specific billing rules separate from the standard MPFS.
POS 65 — End-stage renal disease facility
For dialysis services in Medicare-certified ESRD facilities. Dialysis providers must match POS 65 with the correct HCPCS codes and composite rate billing rules.
What changed with telehealth place of service codes after 2024?
CMS made a material change to telehealth POS billing effective January 1, 2024, formally splitting telehealth into two codes based on patient location.
- POS 02 — telehealth provided other than in the patient’s home
- POS 10 — telehealth provided in the patient’s home
The reimbursement difference is real. CMS reimburses POS 10 claims at the non-facility rate under the MPFS, while POS 02 follows facility-rate logic. For E/M telehealth visits, this gap can represent 30–40% more revenue per encounter when POS 10 applies.
Facility reimbursement rate
Lower physician payment
Modifier 95 typically required
Non-facility reimbursement rate
Higher physician payment
Modifier 95 typically required
The operational challenge goes beyond Medicare. Commercial payers adopted these changes inconsistently throughout 2024 and into 2025. Billing professionals reported denial spikes when submitting POS 10 to insurers still expecting POS 02 or POS 11 with modifier 95.
Some payers rejected POS 11 + modifier 95 claims outright after the CMS update, while others continued to require that exact combination.
For practices with a telehealth volume above a handful of weekly visits, the safest approach is to build payer-specific billing rules — verifying each commercial payer’s telehealth POS requirements separately rather than applying Medicare rules across all payers.
Audio-only telehealth adds another layer.
CMS introduced CPT codes 98008–98015 for audio-only services with specific modifier requirements (modifier 93 for audio-only, modifier 95 for synchronous audio-video). Pairing the wrong modifier with POS 02 or POS 10 remains a consistent denial trigger heading into 2026.
How do you choose the correct place of service code?
Selecting the right POS code on every claim requires a short decision sequence, not memorization of the full list. Run through these five checks before submitting.
Behavioral Health
Therapists may see patients in the office, via telehealth at home, or in a facility-based outpatient program.
Pathology & Labs
The technical and professional component split interacts directly with POS coding.
Dialysis
ESRD services in certified facilities and home dialysis programs require different POS assignments.
Urgent Care & ER
Providers often work across both urgent care and emergency department environments.
ASC Surgery
Dermatology, ophthalmology, and pain management frequently perform procedures in both office and ASC settings.
For multi-location practices, the biggest process failure is allowing a single POS default in the billing system.
Every rendering location needs its own POS assignment, ideally mapped at the scheduling level so the code follows the appointment, not the provider’s home office.
What POS coding mistakes trigger claim denials and audits?
Most POS-related denials fall into a handful of patterns that are preventable with the right claim scrubbing rules.
After CMS’s 2024 update, POS 11 + modifier 95 is rejected by Medicare and many commercial payers. Use POS 10 or POS 02.
Surgery performed at an ASC requires POS 24. Using POS 11 inflates reimbursement and creates audit exposure.
POS 21 (inpatient) used for observation patients triggers Medicare recoupment. Observation stays are outpatient — POS 22.
Provider-based departments require POS 22 or 19, even when they resemble independent offices.
POS 31 (SNF) and POS 32 (nursing facility) carry different Medicare Part A/B implications. Wrong code = wrong payment logic.
From an audit perspective, the OIG and Medicare Administrative Contractors specifically target POS mismatches where the billed setting doesn’t align with admission records, facility attestations, or the provider’s enrollment file.
A pattern of claims using POS 11 at a hospital-based location, for example, flags both overpayment risk and potential False Claims Act exposure.
The fix is straightforward but requires discipline.
Build POS validation into your claim scrubbing process before submission — checking that the POS code on each claim matches the provider’s assigned location, the patient’s documented setting, and any telehealth indicators from the encounter.
Which specialties need extra POS attention?
Some specialties carry higher POS error rates because providers routinely work across multiple settings.
How can your practice prevent POS-related revenue loss?
POS coding errors are a process problem, not a knowledge problem.
Most billing staff know what POS codes mean — the breakdowns happen when systems default to the wrong code, when multi-site providers don’t have location-specific workflows, or when telehealth rules change faster than the billing team can update payer-specific configurations.
Practices that build POS validation into three points — scheduling, claim scrubbing, and payment posting — catch mismatches before they reach the payer and before they compound into AR problems.
At MedHeave, place of service verification is part of the claim scrubbing workflow that runs on every encounter before submission.
The billing team validates POS codes against provider location assignments, checks telehealth modifier and POS alignment per payer, and flags any mismatch for correction the same day.
Combined with 24–48 hour claim submission turnaround and a 72-hour denial response window, POS-related denials get caught and corrected before they age into the 60+ day AR bucket.
If your practice is dealing with persistent POS denials, telehealth billing confusion, or multi-location coding inconsistencies, contact MedHeave to discuss how a structured billing process can close those gaps.
Frequently asked questions
Here are some commonly asked questions about place of service codes:
Yes — and often by a significant margin. CMS assigns different practice expense RVUs to facility and non-facility settings, which means the same CPT code paid under the Medicare Physician Fee Schedule can reimburse 20–50% less in a facility setting compared to an office. If a claim incorrectly uses POS 11 (office) when services were delivered in a hospital outpatient department (POS 22), the payer may deny the claim, recoup the overpayment, or flag it for audit. For high-volume practices, even a small POS error rate across hundreds of monthly claims produces measurable revenue leakage.
POS 10 (telehealth in the patient’s home) qualifies for non-facility reimbursement under Medicare, while POS 02 (telehealth in a non-home setting) follows facility-rate logic. CMS formalized this split effective January 1, 2024, through Transmittal R12671CP. The practical effect is that E/M telehealth visits billed with POS 10 often reimburse 30–40% more than the same visit billed with POS 02. Commercial payers have adopted these rules inconsistently — some follow Medicare’s approach, others still require POS 02 or POS 11 with modifier 95. Build payer-specific telehealth billing rules rather than applying a single default.
CMS defines the official POS code set, and all payers use the same two-digit codes on professional claims. However, commercial insurers may apply different reimbursement rules, modifier requirements, and telehealth POS policies. After the 2024 CMS telehealth update, some commercial payers continued accepting POS 11 + modifier 95 for telehealth, while Medicare required POS 10 or POS 02. Practices working across multiple payers should verify POS requirements per payer and build claim-level rules rather than relying on a universal default.
CMS maintains the complete POS code database with all active two-digit codes, descriptions, and effective dates. The database is updated periodically (most recently in February 2026). The most commonly billed codes on physician claims include POS 11 (office), POS 21 (inpatient hospital), POS 22 (on-campus outpatient hospital), POS 23 (ER), POS 24 (ASC), POS 02 and POS 10 (telehealth), POS 12 (home), POS 31 (SNF), POS 49 (independent clinic), POS 50 (FQHC), and POS 65 (ESRD facility). Always reference the CMS database directly for the most current version.
A POS code mismatch can be the sole reason for a claim denial, particularly when the POS conflicts with the CPT code, the provider’s enrollment status, or the patient’s documented setting. NCCI edits flag certain CPT/POS combinations automatically. Medicare Administrative Contractors also deny claims where the POS doesn’t match admission or location records. Fixing POS denials typically requires resubmission with the corrected code, but if the error pattern is systemic (wrong default in the billing system), the practice may face a larger recoupment or audit.
POS 31 is a skilled nursing facility — a Medicare-certified facility providing skilled nursing care, rehabilitation, and related health services. POS 32 is a nursing facility providing custodial or intermediate care that does not meet the SNF certification standard. The billing implications differ because Medicare Part A covers SNF stays (with specific benefit period rules), while POS 32 services follow different payment pathways. Using the wrong code affects benefit determination, not just reimbursement amount.
On the CMS-1500 paper claim (also called the HCFA-1500 form), the place of service code goes in Box 24B for each line item. On the electronic 837P claim, the POS code is reported in the SV105 segment. Each service line can carry a different POS code if the provider rendered services in multiple settings during the same encounter period — a common scenario for providers who split time between an office and a hospital.
