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ICD-10-PCS 2027 procedure code

0NNB4ZZRelease Nasal Bone, Percutaneous Endoscopic Approach

✓ Valid for 2027

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 0NNB4ZZ

0NNB4ZZ is the ICD-10-PCS code for a release procedure on the nasal 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 lysis of adhesions of nose, the ICD-9-CM procedure title it maps to (21.91).

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 0NNB0ZZ (open) and 0NNB3ZZ (percutaneous).

It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.

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
BNasal Bone

Includes: Vomer of nasal septum

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

ICD-9-CM equivalent

Converter →
  • 21.91Lysis of adhesions of noseapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about 0NNB4ZZ

Is 0NNB4ZZ a valid ICD-10-PCS code for 2027?

Yes. 0NNB4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

What is the ICD-9 procedure code for 0NNB4ZZ?

The CMS GEMs map 0NNB4ZZ to ICD-9-CM 21.91 (Lysis of adhesions of nose).