Head and Facial Bones (0N) ICD-10-PCS
The 0N body system covers Medical and Surgical procedures on head and facial bones, with 1,651 ICD-10-PCS codes across 17 root operations, 1,634 of them billable in fiscal year 2027. Each root operation defines a distinct procedural objective, and the info icons show the official definition with a preview of the codes inside.
Root Operations in This Body System 17 operations · 1,651 codes
| Chars 1–3 | Root Operation | Codes | Billable |
|---|---|---|---|
| 0N2 | ChangeTaking out or off a device from a body part and putting back an identical or similar device in or on the same body part without cutting or puncturing the skin or a mucous membrane | 7 | 6 |
| 0N5 | DestructionPhysical eradication of all or a portion of a body part by the direct use of energy, force or a destructive agent | 70 | 69 |
| 0N8 | DivisionCutting into a body part without draining fluids and/or gases from the body part in order to separate or transect a body part | 70 | 69 |
| 0N9 | DrainageTaking or letting out fluids and/or gases from a body part | 208 | 207 |
| 0NB | ExcisionCutting out or off, without replacement, a portion of a body part | 139 | 138 |
| 0NC | ExtirpationTaking or cutting out solid matter from a body part | 67 | 66 |
| 0ND | ExtractionPulling or stripping out or off all or a portion of a body part by the use of force | 24 | 23 |
| 0NH | InsertionPutting in a non-biological appliance that monitors, assists, performs or prevents a physiological function but does not physically take the place of a body part | 101 | 100 |
| 0NJ | InspectionVisually and/or manually exploring a body part | 13 | 12 |
| 0NN | ReleaseFreeing a body part from an abnormal physical constraint by cutting or by use of force | 67 | 66 |
| 0NP | RemovalTaking out or off a device from a body part | 85 | 84 |
| 0NQ | RepairRestoring, to the extent possible, a body part to its normal anatomic structure and function | 93 | 92 |
| 0NR | ReplacementPutting in or on biological or synthetic material that physically takes the place and/or function of all or a portion of a body part | 208 | 207 |
| 0NS | RepositionMoving to its normal location or other suitable location all or a portion of a body part | 174 | 173 |
| 0NT | ResectionCutting out or off, without replacement, all of a body part | 23 | 22 |
| 0NU | SupplementPutting in or on biological or synthetic material that physically reinforces and/or augments the function of a body part | 208 | 207 |
| 0NW | RevisionCorrecting, to the extent possible, a portion of a malfunctioning device or the position of a displaced device | 94 | 93 |
The info icon shows the official root operation definition and previews the codes in that range.
About the 0N Body System
These codes cover procedures on the skull and facial bones, including the nasal bone, maxilla, and mandible. The listed body parts also include the right and left orbit and the hyoid bone.
Procedures can cut away part or all of a body part, remove solid matter, pull tissue away, destroy tissue, divide bone, or drain fluid or gas. Others inspect, free, repair, or reposition a body part. Device procedures insert, change, remove, or correct a device. Other procedures place material to replace or reinforce a body part.
Questions About This Page
How many codes are in the 0N body system?
The 0N body system contains 1,651 ICD-10-PCS codes in FY 2027, organized into 17 root operations. 1,634 of them are billable on inpatient claims.
What is a root operation?
The root operation is the third character of every ICD-10-PCS code and names the objective of the procedure. Drainage takes fluid out, Excision cuts out a portion of a body part, and Resection removes all of one. Picking the right root operation is the central skill of PCS coding, so each one above carries its official CMS definition.
Related References
Source: CMS FY 2027 ICD-10-PCS order file and code tables, effective October 1, 2026 through September 30, 2027.
