ICD-10-PCS 2027 procedure code
0NNX4ZZRelease Hyoid Bone, Percutaneous Endoscopic Approach
Code unchanged since ICD-10-PCS took effect on October 1, 2015. Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About 0NNX4ZZ
0NNX4ZZ is the ICD-10-PCS code for a release procedure on the hyoid bone using a percutaneous endoscopic approach. In ICD-10-PCS, release means freeing a body part from an abnormal physical constraint by cutting or by the use of force.
In plain terms, this corresponds to other plastic repair of mouth, the ICD-9-CM procedure title it maps to (27.59).
For a different body part, codes include 0NN14ZZ (frontal bone), 0NN34ZZ (right parietal bone), 0NN44ZZ (left parietal bone), 0NN54ZZ (right temporal bone), 0NN64ZZ (left temporal bone), 0NN74ZZ (occipital bone) and 15 more.
The same procedure with a different approach is coded 0NNX0ZZ (open) and 0NNX3ZZ (percutaneous).
It is an operating-room procedure in the MS-DRG logic for DRG 137 (Mouth Procedures with CC/MCC), DRG 138 (Mouth Procedures without CC/MCC), DRG 579 (Other Skin, Subcutaneous Tissue and Breast Procedures with MCC), DRG 580 (Other Skin, Subcutaneous Tissue and Breast Procedures with CC), DRG 581 (Other Skin, Subcutaneous Tissue and Breast Procedures without CC/MCC) and DRG 907 (Other O.R. Procedures for Injuries with MCC), under the surgical categories “Mouth Procedures”, “Other Skin, Subcutaneous Tissue and Breast Procedures”, “Other O.R. Procedures for Injuries” and 1 more.
It has been valid since ICD-10-PCS took effect on October 1, 2015.
What each character means
- 1. Section
- 0Medical and Surgical
- 2. Body System
- NHead and Facial Bones
- 3. Operation
- NRelease
Freeing a body part from an abnormal physical constraint by cutting or by the use of force
Some of the restraining tissue may be taken out but none of the body part is taken out
Includes: Adhesiolysis, carpal tunnel release
- 4. Body Part
- XHyoid Bone
- 5. Approach
- 4Percutaneous Endoscopic
Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach and visualize the site of the procedure
- 6. Device
- ZNo Device
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
Different body part
Different approach
MS-DRG v44.0 grouping
All DRGs →Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.
MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat · Mouth Procedures
MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast · Other Skin, Subcutaneous Tissue and Breast Procedures
MDC 21 · Injuries, Poisonings and Toxic Effects of Drugs · Other O.R. Procedures for Injuries
MDC 24 · Multiple Significant Trauma · Other O.R. Procedures for Multiple Significant Trauma
ICD-9-CM equivalent
Converter →- 27.59Other plastic repair of mouthapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about 0NNX4ZZ
Is 0NNX4ZZ a valid ICD-10-PCS code for 2027?
- Yes. 0NNX4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 0NNX4ZZ an O.R. procedure?
- Yes. 0NNX4ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 0NNX4ZZ group to?
- Depending on the principal diagnosis, 0NNX4ZZ can group to MS-DRG 137, MS-DRG 138, MS-DRG 579, MS-DRG 580, MS-DRG 581 and MS-DRG 907.
What is the ICD-9 procedure code for 0NNX4ZZ?
- The CMS GEMs map 0NNX4ZZ to ICD-9-CM 27.59 (Other plastic repair of mouth).