In medical billing, small details matter. A single two-digit code can mean the difference between full reimbursement and a denied claim. One of the most common — and most frequently misused — codes is Place of Service (POS) code 11.
POS 11 represents an office setting. It is the default code for most outpatient, non-hospital-based physician visits. But using it incorrectly — when services are actually provided in a hospital outpatient department, urgent care center, or other facility — can trigger claim denials, payment reductions, and compliance headaches.
This guide explains exactly what POS 11 means, when to use it, how it affects reimbursement, common errors to avoid, and how it differs from other similar place of service codes.
What Is POS 11 in Medical Billing?
POS code 11 stands for “Office.” According to the official CMS Place of Service Code Set, POS 11 is defined as:
“A location, other than a hospital, skilled nursing facility (SNF), military treatment facility, community health center, state or local public health clinic, or intermediate care facility (ICF), where the health professional routinely provides health examinations, diagnosis, and treatment of illness or injury on an ambulatory basis.”
In simple terms, POS 11 is used when a patient receives services in a physician’s private practice office, a group practice clinic, or any non-institutional outpatient setting where the provider owns or leases the space and delivers care on an ambulatory (walk-in, non-admitted) basis.
Common examples of POS 11 settings:
- A solo physician’s private practice office
- A multi-specialty group practice clinic
- A physical therapy private practice
- A mental health counselor’s private office
- A chiropractor’s office
- A dermatology or ophthalmology private practice
POS 11 tells the payer that the service was provided in a non-facility setting — which has significant implications for reimbursement, coding rules, and billing requirements.
Why POS 11 Matters: Impact on Reimbursement
The place of service code directly affects how much Medicare and other payers reimburse you. This is because reimbursement rates differ between facility and non-facility settings.
Non-Facility Rate (POS 11)
When you bill with POS 11, Medicare assumes you are operating in a non-facility setting. The non-facility rate includes:
- The physician’s work
- Practice expenses (rent, staff salaries, equipment, supplies, utilities)
- Malpractice insurance
Because the physician bears the full cost of running the office, the non-facility reimbursement rate is higher than the facility rate.
Facility Rate (e.g., POS 22 – Hospital Outpatient)
When services are provided in a hospital outpatient department (POS 22), Medicare assumes the hospital bears the facility overhead costs. The physician is paid only for the professional component (their work and malpractice), not practice expenses. Therefore, the facility rate is lower for the same CPT code.
Example: CPT 99214 (Established patient office visit, level 4)
| Setting | POS Code | 2026 Estimated Non-Facility Rate | 2026 Estimated Facility Rate | Difference |
| Physician office | 11 | $128.33 | N/A | Physician receives full non-facility rate |
| Hospital outpatient | 22 | N/A | $80.95 | Physician receives lower facility rate (~37% less) |
Key takeaway: Using POS 11 incorrectly (e.g., billing POS 11 for services actually provided in a hospital outpatient department) results in overpayment and is considered billing fraud. Using the correct POS code is a compliance requirement, not a revenue maximization strategy.
When to Use POS 11 (And When Not To)
Correct Uses of POS 11
| Scenario | Correct POS Code | Reason |
| Patient seen in your private practice office (leased or owned space) | 11 | You bear all facility overhead costs |
| Patient seen in a group practice clinic where no facility fee is billed | 11 | The practice operates as an office setting |
| Telehealth visit originating from your office (you are in your office, patient is elsewhere) | 11 | Your location is the office; use modifier 95 or place of service equivalent for telehealth |
| Provider performs a procedure in their private office procedure room | 11 | The office is the site of service |
Incorrect Uses of POS 11
| Scenario | Correct POS Code | Reason |
| Patient seen in a hospital outpatient department (even if you are the attending physician) | 22 (Hospital Outpatient) | Hospital is the facility; you receive facility rate |
| Patient seen in an emergency department (hospital-based) | 23 (Emergency Room – Hospital) | Emergency services have specific POS code |
| Patient seen in an urgent care center (facility-based) | 20 (Urgent Care Facility) | Urgent care centers have their own POS code |
| Patient seen in a skilled nursing facility (SNF) | 31 (Skilled Nursing Facility) | SNF services require POS 31 |
| Patient seen in an ambulatory surgical center (ASC) | 24 (Ambulatory Surgical Center) | ASC has its own POS code |
| Patient seen in a community health center (FQHC) | 50 (Federally Qualified Health Center) | FQHCs use POS 50 |
Critical rule: The POS code reflects the physical location where the patient encounter occurred, not your billing address or where your practice is legally incorporated.
POS 11 vs. Other Common POS Codes
| POS Code | Description | Typical Reimbursement Level | When to Use |
| 11 | Office | Non-facility (higher) | Private practice office, group practice clinic |
| 19 | Off Campus-Outpatient Hospital | Facility (lower) | Hospital outpatient department located off the main hospital campus |
| 22 | On Campus-Outpatient Hospital | Facility (lower) | Hospital outpatient department located on the main hospital campus |
| 20 | Urgent Care Facility | Varies | Freestanding urgent care center (not hospital-based) |
| 23 | Emergency Room – Hospital | Facility (higher for ER) | Hospital-based emergency department |
| 24 | Ambulatory Surgical Center | ASC-specific | Procedure performed at an ASC |
| 31 | Skilled Nursing Facility | Facility (lower) | SNF visit (Part B therapy or physician visit) |
| 50 | Federally Qualified Health Center | FQHC-specific | Services at an FQHC |
POS 11 vs. POS 22 (The Most Common Confusion)
The most frequent POS coding error involves confusing POS 11 with POS 22 (Hospital Outpatient – On Campus). Here is a simple decision tree:
- Does the patient encounter occur in a hospital-owned building that is part of the hospital’s licensed facility? → Use POS 22 (or POS 19 for off-campus)
- Does the patient encounter occur in a privately owned or leased office space that is not part of a hospital license? → Use POS 11
Even if you are the same physician seeing the same patient, the POS code changes based on the location. Some physicians see patients both in their private office (POS 11) and at the hospital outpatient clinic (POS 22). Both are correct for the respective locations.
POS 11 and Telehealth: Special Considerations
With the expansion of telehealth, POS coding has become more complex. The general rule is: The POS code reflects the location where the provider is physically located, unless the payer specifies otherwise.
| Telehealth Scenario | POS Code | Modifier |
| Provider in office, patient at home | 11 | 95 (synchronous audio-video) or GT |
| Provider at home, patient at home | 02 (Telehealth) | 95 or GT |
| Provider in office, patient at office (in-person) | 11 | No modifier needed |
Medicare’s 2026 telehealth POS guidance: For services furnished via telehealth where the patient is at home, many payers accept POS 10 (Telehealth Provided in Patient’s Home) with modifier 95. However, for traditional POS 11 office billing, the provider must be physically present in the office location. Always verify the current telehealth policies for each payer.
For more on telehealth billing, see our guide on How to Bill Medicare as a Provider.
Common POS 11 Billing Errors and How to Avoid Them
| Error | Consequence | How to Avoid |
| Using POS 11 for hospital outpatient services | Overpayment; potential fraud investigation | Verify the facility’s license status before billing |
| Using POS 11 for urgent care center visits | Claim denial or recoupment | Use POS 20 for freestanding urgent care |
| Using POS 11 for SNF visits when POS 31 is required | Claim denial | SNF visits require POS 31 (Medicare Part B therapy or physician visit in SNF) |
| Using POS 11 for telehealth when provider is at home | Incorrect payment; audit flag | Use POS 10 (patient home) or POS 02 (telehealth) depending on payer |
| Billing POS 11 without documenting the service location | Claim denial | Always document the physical address where services were rendered |
| Using outdated POS codes on CMS-1500 | Claim rejection | Use the current CMS Place of Service Code Set (updated annually) |
Documentation best practice: For every claim, the medical record should clearly indicate the physical location where the service was delivered. If a patient is seen at multiple locations (e.g., your private office and a hospital outpatient clinic), the POS code on each claim must match that specific location.
POS 11 and Modifier 25 (Separately Identifiable E/M Service)
When an E/M service (e.g., office visit) is performed on the same day as a minor procedure, modifier 25 is appended to the E/M code to indicate that the visit was significant and separately identifiable from the procedure.
Important: When billing an E/M service with modifier 25 under POS 11, the documentation must clearly show that the E/M service was distinct from the procedure and medically necessary. The POS code remains 11, but you must include:
- The procedure code (e.g., 11100 for biopsy)
- The E/M code with modifier 25 (e.g., 99213-25)
For more on E/M coding, see our guides: CPT 99213 and CPT 99214.
Summary Table: POS 11 at a Glance
| Attribute | Detail |
| Code | 11 |
| Description | Office |
| Definition | A location (non-hospital, non-SNF, non-FQHC, non-ICF) where health professionals routinely provide diagnosis and treatment on an ambulatory basis |
| Examples | Private practice office, group practice clinic, therapy private practice, chiropractor office |
| Reimbursement Type | Non-facility (higher rate – includes practice expenses) |
| Common CPT Codes Used | 99202–99215 (E/M office visits), 97110–97140 (therapy timed codes), 11100 (biopsy), 69210 (cerumen removal), etc. |
| Form Location | CMS-1500 Box 24B (Place of Service) |
| Key Rule | Use only for non-facility, non-hospital licensed settings where provider bears overhead costs |
Final Thoughts
POS 11 is the most frequently used place of service code for outpatient professional claims. But its frequency does not make it simple. Misuse of POS 11 is a common compliance risk, often arising from confusion about whether a location qualifies as an “office” or a “facility.”
The golden rule: The place of service code must match the physical location where the patient encounter occurred. Your billing address, your contract with a hospital, or your preference for higher reimbursement does not determine the POS code — the four walls where the patient sits do.
Document location. Code accurately. And when in doubt, consult the official CMS Place of Service Code Set or your payer’s billing manual.
Frequently Asked Questions (FAQs)
1. What does POS 11 stand for in medical billing?
POS 11 stands for “Office.” It indicates that the patient encounter occurred in a physician’s private practice office, group practice clinic, or other non-hospital, non-facility ambulatory setting.
2. When should I use POS code 11?
Use POS 11 when services are provided in a setting that is not a hospital, skilled nursing facility, urgent care center, or other institutional facility. Common examples include private practice offices, group practice clinics, physical therapy private practices, and mental health private offices.
3. What is the difference between POS 11 and POS 22?
POS 11 (Office) is for non-facility settings like private practice offices. POS 22 (Hospital Outpatient – On Campus) is for services provided in a hospital-owned outpatient department. The reimbursement rate for POS 11 is generally higher because it includes practice expenses.
4. Can I use POS 11 for telehealth services?
It depends. Under traditional rules, the POS code reflects the provider’s location. If you are in your office when providing telehealth, POS 11 is appropriate with modifier 95. If you are at home, use POS 10 (Telehealth Provided in Patient’s Home) or POS 02. Always verify payer-specific telehealth guidance.
5. What is the reimbursement difference between POS 11 and facility-based codes?
The non-facility rate (POS 11) is higher because it includes practice expenses like rent, staff salaries, and equipment. The facility rate (e.g., POS 22) is lower — only covering the physician’s work and malpractice. The difference can be 30–40% for the same CPT code.
6. What happens if I use POS 11 incorrectly?
Using POS 11 for services actually provided in a hospital outpatient department constitutes billing fraud. Consequences include claim recoupment, fines, compliance audits, and potential exclusion from Medicare. Always use the POS code that matches the actual service location.
7. Does modifier 25 affect the POS code?
No. Modifier 25 indicates a separately identifiable E/M service on the same day as a procedure, but it does not change the place of service. The POS code remains based on the physical location where services were provided.
8. Where can I find the official list of POS codes?
The CMS Place of Service Code Set is published on the CMS website and updated annually. See the external resources below for the official link.
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