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ICD-10-PCS 2027 procedure code

0CNP0ZZRelease Tonsils, Open Approach

✓ Valid for 2027O.R. procedure

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 0CNP0ZZ

0CNP0ZZ is the ICD-10-PCS code for a release procedure on the tonsils 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 tonsils and adenoids, the ICD-9-CM procedure title it maps to (28.99).

For a different body part, codes include 0CN00ZZ (upper lip), 0CN10ZZ (lower lip), 0CN20ZZ (hard palate), 0CN30ZZ (soft palate), 0CN40ZZ (buccal mucosa), 0CN50ZZ (upper gingiva) and 18 more.

The same procedure with a different approach is coded 0CNP3ZZ (percutaneous) and 0CNPXZZ (external).

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
CMouth and Throat
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
PTonsils

Includes: Palatine tonsil

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

MS-DRG v44.0 grouping

All DRGs →

Surgical MS-DRGs this procedure can group to, depending on the principal diagnosis's MDC.

ICD-9-CM equivalent

Converter →
  • 28.99Other operations on tonsils and adenoidsapproximate

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 0CNP0ZZ

Is 0CNP0ZZ a valid ICD-10-PCS code for 2027?

Yes. 0CNP0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 0CNP0ZZ an O.R. procedure?

Yes. 0CNP0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 0CNP0ZZ group to?

Depending on the principal diagnosis, 0CNP0ZZ can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.

What is the ICD-9 procedure code for 0CNP0ZZ?

The CMS GEMs map 0CNP0ZZ to ICD-9-CM 28.99 (Other operations on tonsils and adenoids).