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ICD-10-PCS 2027 procedure code

099Q0ZZDrainage of Right Maxillary Sinus, 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 099Q0ZZ

099Q0ZZ is the ICD-10-PCS code for a drainage procedure on the right maxillary sinus using an open 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 other external maxillary antrotomy, the ICD-9-CM procedure title it maps to (22.39).

For a different body part, codes include 09900ZZ (right external ear), 09910ZZ (left external ear), 09930ZZ (right external auditory canal), 09940ZZ (left external auditory canal), 09950ZZ (right middle ear), 09960ZZ (left middle ear) and 22 more.

The same procedure with a different approach is coded 099Q3ZZ (percutaneous), 099Q4ZZ (percutaneous endoscopic), 099Q7ZZ (via natural or artificial opening) and 099Q8ZZ (via natural or artificial opening endoscopic).

With a different device, use 099Q00Z (drainage device).

It is an operating-room procedure in the MS-DRG logic for DRG 135 (Sinus and Mastoid Procedures with CC/MCC) and DRG 136 (Sinus and Mastoid Procedures without CC/MCC), under the surgical category “Sinus and Mastoid 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
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
QMaxillary 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 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.

MDC 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat · Sinus and Mastoid Procedures

ICD-9-CM equivalent

Converter →
  • 22.39Other external maxillary antrotomyapproximate

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 099Q0ZZ

Is 099Q0ZZ a valid ICD-10-PCS code for 2027?

Yes. 099Q0ZZ is valid for inpatient procedures from October 1, 2026 through September 30, 2027.

Is 099Q0ZZ an O.R. procedure?

Yes. 099Q0ZZ is an O.R. procedure in MS-DRG v44.0.

What DRG does 099Q0ZZ group to?

Depending on the principal diagnosis, 099Q0ZZ can group to MS-DRG 135 and MS-DRG 136.

What is the ICD-9 procedure code for 099Q0ZZ?

The CMS GEMs map 099Q0ZZ to ICD-9-CM 22.39 (Other external maxillary antrotomy).