ICD-10-PCS 2027 procedure code
09NB0ZZRelease Right Mastoid Sinus, Open 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 09NB0ZZ
09NB0ZZ is the ICD-10-PCS code for a release procedure on the right mastoid sinus using an open 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 09N00ZZ (right external ear), 09N10ZZ (left external ear), 09N30ZZ (right external auditory canal), 09N40ZZ (left external auditory canal), 09N50ZZ (right middle ear), 09N60ZZ (left middle ear) and 22 more.
The same procedure with a different approach is coded 09NB3ZZ (percutaneous), 09NB4ZZ (percutaneous endoscopic) 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
- 0Open
Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure
- 6. Device
- ZNo Device
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
Different body part
- 09N00ZZExternal Ear, Right
- 09N10ZZExternal Ear, Left
- 09N30ZZExternal Auditory Canal, Right
- 09N40ZZExternal Auditory Canal, Left
- 09N50ZZMiddle Ear, Right
- 09N60ZZMiddle Ear, Left
- 09N70ZZTympanic Membrane, Right
- 09N80ZZTympanic Membrane, Left
- 09N90ZZAuditory Ossicle, Right
- 09NA0ZZAuditory Ossicle, Left
- 09NC0ZZMastoid Sinus, Left
- 09ND0ZZInner Ear, Right
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 09NB0ZZ
Is 09NB0ZZ a valid ICD-10-PCS code for 2027?
- Yes. 09NB0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 09NB0ZZ an O.R. procedure?
- Yes. 09NB0ZZ is an O.R. procedure in MS-DRG v44.0.
What DRG does 09NB0ZZ group to?
- Depending on the principal diagnosis, 09NB0ZZ can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.
What is the ICD-9 procedure code for 09NB0ZZ?
- The CMS GEMs map 09NB0ZZ to ICD-9-CM 20.99 (Other operations on middle and inner ear).