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ICD-10-PCS 2027 procedure code

099N4ZZDrainage of Nasopharynx, Percutaneous Endoscopic 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 099N4ZZ

099N4ZZ is the ICD-10-PCS code for a drainage procedure on the nasopharynx using a percutaneous endoscopic approach. In ICD-10-PCS, drainage means taking or letting out fluids and/or gases from a body part.

In plain terms, this corresponds to Pharyngotomy, the ICD-9-CM procedure title it maps to (29.0).

For a different body part, codes include 09904ZZ (right external ear), 09914ZZ (left external ear), 09934ZZ (right external auditory canal), 09944ZZ (left external auditory canal), 09974ZZ (right tympanic membrane), 09984ZZ (left tympanic membrane) and 16 more.

The same procedure with a different approach is coded 099N0ZZ (open), 099N3ZZ (percutaneous), 099N7ZZ (via natural or artificial opening) and 099N8ZZ (via natural or artificial opening endoscopic).

With a different device, use 099N40Z (drainage device).

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), DRG 145 (Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC), DRG 907 (Other O.R. Procedures for Injuries with MCC), DRG 908 (Other O.R. Procedures for Injuries with CC) and DRG 909 (Other O.R. Procedures for Injuries without CC/MCC), under the surgical categories “Other Ear, Nose, Mouth and Throat O.R. Procedures”, “Other O.R. Procedures for Injuries” and “Other O.R. Procedures for Multiple Significant Trauma”.

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
9Drainage

Taking or letting out fluids and/or gases from a body part

The qualifier DIAGNOSTIC is used to identify drainage procedures that are biopsies

Includes: Thoracentesis, incision and drainage

4. Body Part
NNasopharynx

Includes: Choana; Fossa of Rosenmuller; Pharyngeal recess; Rhinopharynx

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 device

Different qualifier

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 →
  • 29.0Pharyngotomyapproximate

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 099N4ZZ

Is 099N4ZZ a valid ICD-10-PCS code for 2027?

Yes. 099N4ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 099N4ZZ an O.R. procedure?

Yes. 099N4ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 099N4ZZ group to?

Depending on the principal diagnosis, 099N4ZZ can group to MS-DRG 143, MS-DRG 144, MS-DRG 145, MS-DRG 907, MS-DRG 908 and MS-DRG 909.

What is the ICD-9 procedure code for 099N4ZZ?

The CMS GEMs map 099N4ZZ to ICD-9-CM 29.0 (Pharyngotomy).