ICD-10-PCS 2027 procedure code
099400ZDrainage of Left External Auditory Canal with Drainage Device, Open Approach
Short description: Drain of L Ext Auditory Canal 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 099400Z
099400Z is the ICD-10-PCS code for a drainage procedure on the left external auditory canal 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 incision of external auditory canal, the ICD-9-CM procedure title it maps to (18.02).
For a different body part, codes include 099000Z (right external ear), 099100Z (left external ear), 099300Z (right 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 099430Z (percutaneous), 099440Z (percutaneous endoscopic), 099470Z (via natural or artificial opening), 099480Z (via natural or artificial opening endoscopic) and 0994X0Z (external).
With a different device, use 09940ZZ (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
- 4External Auditory Canal, Left
Includes: External auditory meatus
- 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
- 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 →- 18.02Incision of external auditory canalapproximate
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 099400Z
Is 099400Z a valid ICD-10-PCS code for 2027?
- Yes. 099400Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
What is the ICD-9 procedure code for 099400Z?
- The CMS GEMs map 099400Z to ICD-9-CM 18.02 (Incision of external auditory canal).