ICD-10-PCS 2027 procedure code
09NB4ZZRelease Right Mastoid Sinus, Percutaneous Endoscopic Approach
Short description: Release Right Mastoid Sinus, Perc Endo 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 09NB4ZZ
09NB4ZZ is the ICD-10-PCS code for a release procedure on the right mastoid sinus 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 operations on middle and inner ear, the ICD-9-CM procedure title it maps to (20.99).
For a different body part, codes include 09N04ZZ (right external ear), 09N14ZZ (left external ear), 09N34ZZ (right external auditory canal), 09N44ZZ (left external auditory canal), 09N74ZZ (right tympanic membrane), 09N84ZZ (left tympanic membrane) and 16 more.
The same procedure with a different approach is coded 09NB0ZZ (open), 09NB3ZZ (percutaneous) and 09NB8ZZ (via natural or artificial opening endoscopic).
It is an operating-room procedure in the MS-DRG logic for DRG 143 (Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC), DRG 144 (Other Ear, Nose, Mouth and Throat O.R. Procedures with CC) and DRG 145 (Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC), under the surgical category “Other Ear, Nose, Mouth and Throat O.R. Procedures”.
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
- 9Ear, Nose, Sinus
- 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
- BMastoid Sinus, Right
- 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
- 09N04ZZExternal Ear, Right
- 09N14ZZExternal Ear, Left
- 09N34ZZExternal Auditory Canal, Right
- 09N44ZZExternal Auditory Canal, Left
- 09N74ZZTympanic Membrane, Right
- 09N84ZZTympanic Membrane, Left
- 09NC4ZZMastoid Sinus, Left
- 09NF4ZZEustachian Tube, Right
- 09NG4ZZEustachian Tube, Left
- 09NK4ZZNasal Mucosa and Soft Tissue
- 09NL4ZZNasal Turbinate
- 09NM4ZZNasal Septum
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 · Other Ear, Nose, Mouth and Throat O.R. Procedures
ICD-9-CM equivalent
Converter →- 20.99Other operations on middle and inner earapproximate
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 09NB4ZZ
Is 09NB4ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09NB4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09NB4ZZ an O.R. procedure?
- Yes. 09NB4ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09NB4ZZ group to?
- Depending on the principal diagnosis, 09NB4ZZ can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.
What is the ICD-9 procedure code for 09NB4ZZ?
- The CMS GEMs map 09NB4ZZ to ICD-9-CM 20.99 (Other operations on middle and inner ear).