ICD-10-PCS 2027 procedure code
099C80ZDrainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic
Short description: Drainage of Left Mastoid Sinus with Drainage Device, Endo
Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-PCS release from CMS. Page updated September 29, 2026. About our data
About 099C80Z
099C80Z is the ICD-10-PCS code for a drainage procedure on the left mastoid sinus using a via natural or artificial opening endoscopic 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 miscellaneous procedures, the ICD-9-CM procedure title it maps to (99.99).
For a different body part, codes include 099380Z (right external auditory canal), 099480Z (left external auditory canal), 099580Z (right middle ear), 099680Z (left middle ear), 099780Z (right tympanic membrane), 099880Z (left tympanic membrane) and 20 more.
The same procedure with a different approach is coded 099C00Z (open), 099C30Z (percutaneous), 099C40Z (percutaneous endoscopic) and 099C70Z (via natural or artificial opening).
With a different device, use 099C8ZZ (no device).
It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.
It was added in FY2018, effective October 1, 2017.
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
- CMastoid Sinus, Left
Includes: Mastoid air cells
- 5. Approach
- 8Via Natural or Artificial Opening Endoscopic
Entry of instrumentation through a natural or artificial external opening to reach and visualize 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
- 099380ZExternal Auditory Canal, Right
- 099480ZExternal Auditory Canal, Left
- 099580ZMiddle Ear, Right
- 099680ZMiddle Ear, Left
- 099780ZTympanic Membrane, Right
- 099880ZTympanic Membrane, Left
- 099980ZAuditory Ossicle, Right
- 099A80ZAuditory Ossicle, Left
- 099B80ZMastoid Sinus, Right
- 099D80ZInner Ear, Right
- 099E80ZInner Ear, Left
- 099F80ZEustachian Tube, Right
Different approach
Different device
ICD-9-CM equivalent
Converter →- 99.99Other miscellaneous proceduresapproximate
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
- FY2018 (effective 10/1/2017): Added
- No changes since FY2018.
Common questions about 099C80Z
Is 099C80Z a valid ICD-10-PCS code for 2027?
- Yes. 099C80Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 099C80Z?
- The CMS GEMs map 099C80Z to ICD-9-CM 99.99 (Other miscellaneous procedures).