Complete CMS Place of Service Code List: POS 01 Through 99
The CMS place of service code set is the official list of two-digit codes that tell a payer where a service was provided. This page lists every code from 01 to 99 with its official CMS name and marks the ones that matter for mental health billing. Checked against CMS.gov on 9/29/26.
Get My Free ConsultationIn this guide
- ✓ All codes, 01 through 99
- ✓ Reserved (unassigned) ranges
- ✓ The codes therapists and psychiatrists use most
- ✓ Mental health facility codes 51–58
- ✓ Common questions
Place Of Service Code List at a glance
This page covers place of service code list for mental health billing: what the codes cover, how payers apply them, and what to document. Psychotherapists and psychiatrists both use these codes, so the sections below call out differences where they matter. Payer rules vary, so confirm current requirements with the payer before you bill.
What is the CMS place of service code set?
The place of service (POS) code set is the official list of two-digit codes CMS publishes to show where a service was provided. Every claim line carries one POS code, and payers use it to decide coverage and the payment rate. The Place of Service Code Set on CMS.gov runs from 01 to 99. As of the page modified 02/17/2026, 52 of those codes are assigned and the rest are reserved.
Read this first: CMS assigns the code and its name. Each payer decides which codes it accepts for a service. For the mental health codes you will use most, see the place of service codes guide. For modifiers, see the CPT modifiers guide. Current as of last search 9/29/26 — reconfirm on CMS.gov before publishing.
The codes therapists and psychiatrists use most
Office and home: POS 11 and 12
POS 11 is the office. POS 12 is the patient’s private residence, in person. Assisted living (13), group home (14) and custodial care (33) are separate codes.
Telehealth: POS 10 and 02
POS 10 is telehealth with the patient at home. POS 02 is telehealth with the patient anywhere else. Both are on the CMS list.
Mental health facilities: POS 51–58
The list includes inpatient psychiatric (51), partial hospitalization (52), community mental health center (53), residential and non-residential substance use settings and more. Payer rules vary.
Every CMS place of service code, 01 through 99
This is the full Place of Service Code Set on CMS.gov, codes 01 through 99. CMS lists the code and the official name. Code names below match the CMS.gov page, which was last modified 02/17/2026. Current as of last search 9/29/26 — reconfirm on CMS.gov before publishing.
All CMS place of service codes (01–99)
Most mental health claims use POS 11, 12, 10 or 02. Payers may limit which codes they accept for a given service, so check the payer’s policy.
| Code | Official CMS name | Mental health billing |
|---|---|---|
| POS 01 | Pharmacy | — |
| POS 02 | Telehealth Provided Other than in Patient’s Home | Explained in the POS guide |
| POS 03 | School | — |
| POS 04 | Homeless Shelter | — |
| POS 05 | Indian Health Service Free-standing Facility | — |
| POS 06 | Indian Health Service Provider-based Facility | — |
| POS 07 | Tribal 638 Free-standing Facility | — |
| POS 08 | Tribal 638 Provider-based Facility | — |
| POS 09 | Prison/Correctional Facility | — |
| POS 10 | Telehealth Provided in Patient’s Home | Explained in the POS guide |
| POS 11 | Office | Explained in the POS guide |
| POS 12 | Home | Explained in the POS guide |
| POS 13 | Assisted Living Facility | Explained in the POS guide |
| POS 14 | Group Home | Explained in the POS guide |
| POS 15 | Mobile Unit | — |
| POS 16 | Temporary Lodging | — |
| POS 17 | Walk-in Retail Health Clinic | — |
| POS 18 | Place of Employment-Worksite | — |
| POS 19 | Off Campus-Outpatient Hospital | — |
| POS 20 | Urgent Care Facility | — |
| POS 21 | Inpatient Hospital | — |
| POS 22 | On Campus-Outpatient Hospital | — |
| POS 23 | Emergency Room – Hospital | — |
| POS 24 | Ambulatory Surgical Center | — |
| POS 25 | Birthing Center | — |
| POS 26 | Military Treatment Facility | — |
| POS 27 | Outreach Site/Street | — |
| POS 28-30 | Unassigned | Reserved by CMS — do not use |
| POS 31 | Skilled Nursing Facility | — |
| POS 32 | Nursing Facility | — |
| POS 33 | Custodial Care Facility | Explained in the POS guide |
| POS 34 | Hospice | — |
| POS 35-40 | Unassigned | Reserved by CMS — do not use |
| POS 41 | Ambulance - Land | — |
| POS 42 | Ambulance – Air or Water | — |
| POS 43-48 | Unassigned | Reserved by CMS — do not use |
| POS 49 | Independent Clinic | — |
| POS 50 | Federally Qualified Health Center | — |
| POS 51 | Inpatient Psychiatric Facility | Mental health or substance use facility — confirm payer rules |
| POS 52 | Psychiatric Facility-Partial Hospitalization | Mental health or substance use facility — confirm payer rules |
| POS 53 | Community Mental Health Center | Explained in the POS guide |
| POS 54 | Intermediate Care Facility/Individuals with Intellectual Disabilities | — |
| POS 55 | Residential Substance Abuse Treatment Facility | Explained in the POS guide |
| POS 56 | Psychiatric Residential Treatment Center | Mental health or substance use facility — confirm payer rules |
| POS 57 | Non-residential Substance Abuse Treatment Facility | Mental health or substance use facility — confirm payer rules |
| POS 58 | Non-residential Opioid Treatment Facility | Mental health or substance use facility — confirm payer rules |
| POS 59 | Unassigned | Reserved by CMS — do not use |
| POS 60 | Mass Immunization Center | — |
| POS 61 | Comprehensive Inpatient Rehabilitation Facility | — |
| POS 62 | Comprehensive Outpatient Rehabilitation Facility | — |
| POS 63-64 | Unassigned | Reserved by CMS — do not use |
| POS 65 | End-Stage Renal Disease Treatment Facility | — |
| POS 66 | Programs of All-Inclusive Care for the Elderly (PACE) Center | — |
| POS 67-70 | Unassigned | Reserved by CMS — do not use |
| POS 71 | Public Health Clinic | — |
| POS 72 | Rural Health Clinic | — |
| POS 73-80 | Unassigned | Reserved by CMS — do not use |
| POS 81 | Independent Laboratory | — |
| POS 82-98 | Unassigned | Reserved by CMS — do not use |
| POS 99 | Other Place of Service | — |
Place of service code list: frequently asked questions
How many place of service codes are there?
CMS lists codes 01 through 99. As of the CMS.gov page modified 02/17/2026, 52 are assigned and the remaining codes are reserved and unassigned. Source: CMS, Place of Service Code Set.
Which place of service codes are reserved?
CMS marks these ranges as unassigned: 28–30, 35–40, 43–48, 59, 63–64, 67–70, 73–80 and 82–98. Do not bill an unassigned code.
Which place of service code is used for a psychotherapy session in an office?
POS 11, Office. Use POS 10 or 02 for telehealth and POS 12 for an in-person visit at a private residence.
Does every payer accept every place of service code?
No. CMS publishes the code set. Each payer, including Medicare, Medicaid and private plans, decides which codes it accepts for a service and how each one pays. Check the payer’s policy.
Where this information comes from
Current as of last search 9/29/26 — reconfirm on CMS.gov before publishing. Names on this page match the CMS.gov list. Operational guidance for a billing service, not legal advice.
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