ICD-10-PCS 2027 procedure code
099900ZDrainage of Right Auditory Ossicle with Drainage Device, Open Approach
Short description: Drainage of R Auditory Ossicle 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 099900Z
099900Z is the ICD-10-PCS code for a drainage procedure on the right auditory ossicle 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 operations on ossicular chain, the ICD-9-CM procedure title it maps to (19.3).
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 099970Z (via natural or artificial opening) and 099980Z (via natural or artificial opening endoscopic).
With a different device, use 09990ZZ (no device).
It is an operating-room procedure in the MS-DRG logic for DRG 143 (Other Ear, Nose, Mouth and Throat O.R. Procedures with MCC), DRG 144 (Other Ear, Nose, Mouth and Throat O.R. Procedures with CC) and DRG 145 (Other Ear, Nose, Mouth and Throat O.R. Procedures without CC/MCC), under the surgical category “Other Ear, Nose, Mouth and Throat O.R. 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
- 9Auditory Ossicle, 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
- 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
- 099A00ZAuditory Ossicle, Left
- 099B00ZMastoid Sinus, Right
- 099C00ZMastoid Sinus, Left
- 099D00ZInner Ear, Right
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 · Other Ear, Nose, Mouth and Throat O.R. Procedures
ICD-9-CM equivalent
Converter →- 19.3Other operations on ossicular chainapproximate
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 099900Z
Is 099900Z a valid ICD-10-PCS code for 2027?
- Yes. 099900Z is valid for inpatient procedures from October 1, 2026 through September 30, 2027.
Is 099900Z an O.R. procedure?
- Yes. 099900Z is an O.R. procedure in MS-DRG v44.0.
What DRG does 099900Z group to?
- Depending on the principal diagnosis, 099900Z can group to MS-DRG 143, MS-DRG 144 and MS-DRG 145.
What is the ICD-9 procedure code for 099900Z?
- The CMS GEMs map 099900Z to ICD-9-CM 19.3 (Other operations on ossicular chain).