ICD-10-PCS 2027 procedure code
099100ZDrainage of Left External Ear with Drainage Device, Open Approach
Short description: Drainage of Left External Ear 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 099100Z
099100Z is the ICD-10-PCS code for a drainage procedure on the left external ear 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 incision of external ear, the ICD-9-CM procedure title it maps to (18.09).
For a different body part, codes include 099000Z (right external ear), 099300Z (right external auditory canal), 099400Z (left external auditory canal), 099500Z (right middle ear), 099600Z (left middle ear), 099700Z (right tympanic membrane) and 22 more.
The same procedure with a different approach is coded 099130Z (percutaneous), 099140Z (percutaneous endoscopic) and 0991X0Z (external).
With a different device, use 09910ZZ (no device).
It doesn't appear in the MS-DRG procedure index, so on its own it doesn't change the DRG assignment.
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
- 1External Ear, Left
- 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
- 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
- 099D00ZInner Ear, Right
Different approach
Different device
ICD-9-CM equivalent
Converter →- 18.09Other incision of external earapproximate
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 099100Z
Is 099100Z a valid ICD-10-PCS code for 2027?
- Yes. 099100Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 099100Z?
- The CMS GEMs map 099100Z to ICD-9-CM 18.09 (Other incision of external ear).