ICD-10-PCS 2027 procedure code
099R00ZDrainage of Left Maxillary Sinus with Drainage Device, Open Approach
Short description: Drainage of L Maxillary Sinus with Drain Dev, 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 099R00Z
099R00Z is the ICD-10-PCS code for a drainage procedure on the left maxillary sinus using an open approach with drainage device. 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 099000Z (right external ear), 099100Z (left external ear), 099300Z (right external auditory canal), 099400Z (left external auditory canal), 099500Z (right middle ear), 099600Z (left middle ear) and 22 more.
The same procedure with a different approach is coded 099R30Z (percutaneous), 099R40Z (percutaneous endoscopic), 099R70Z (via natural or artificial opening) and 099R80Z (via natural or artificial opening endoscopic).
With a different device, use 099R0ZZ (no 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
- RMaxillary Sinus, Left
Includes: Antrum of Highmore
- 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
- 0Drainage Device
Includes: Cystostomy tube; Foley catheter; Percutaneous nephrostomy catheter; Thoracostomy tube
- 7. Qualifier
- ZNo Qualifier
Other versions of this procedure
Different body part
- 099000ZExternal Ear, Right
- 099100ZExternal Ear, Left
- 099300ZExternal Auditory Canal, Right
- 099400ZExternal Auditory Canal, Left
- 099500ZMiddle Ear, Right
- 099600ZMiddle Ear, Left
- 099700ZTympanic Membrane, Right
- 099800ZTympanic Membrane, Left
- 099900ZAuditory Ossicle, Right
- 099A00ZAuditory Ossicle, Left
- 099B00ZMastoid Sinus, Right
- 099C00ZMastoid Sinus, Left
Different approach
Different device
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
- 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 099R00Z
Is 099R00Z a valid ICD-10-PCS code for 2027?
- Yes. 099R00Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 099R00Z an O.R. procedure?
- Yes. 099R00Z is an O.R. procedure in MS-DRG v44.0.
What DRG does 099R00Z group to?
- Depending on the principal diagnosis, 099R00Z can group to MS-DRG 135 and MS-DRG 136.
What is the ICD-9 procedure code for 099R00Z?
- The CMS GEMs map 099R00Z to ICD-9-CM 22.39 (Other external maxillary antrotomy).