099900ZDrainage of Right Auditory Ossicle with Drainage Device, Open Approach
- Billable / Specific Code
099900Z is a billable ICD-10-PCS procedure code for Drainage of Right Auditory Ossicle with Drainage Device, Open Approach. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRGs 143, 144, 145. The root operation Drainage involves taking or letting out fluids and/or gases from a body part. In AHRQ's Clinical Classifications Software (CCSR), this procedure falls under ENT drainage (excluding myringotomy).
Code Identity
PCS Table Breakdown
Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.
| Position | Designation | Value | Meaning |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | 9 | Ear, Nose, Sinus |
| 3 | Operation | 9 | Drainage |
| 4 | BodyPart | 9 | Auditory Ossicle, Right |
| 5 | Approach | 0 | Open |
| 6 | Device | 0 | Drainage Device |
| 7 | Qualifier | Z | No Qualifier |
In the ICD-10-PCS Alphabetic Index
These FY 2027 ICD-10-PCS Alphabetic Index entries lead to this code:
To code drainage of the right auditory ossicle, open the FY 2027 ICD-10-PCS Alphabetic Index at Drainage, then the subterms Auditory Ossicle, Right. The index leads to table 099, where the approach, device and qualifier values shown in the breakdown above complete the seven-character code 099900Z.
Clinical Classification (CCSR)
AHRQ groups this procedure code into these clinical categories.
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for this code under the General Equivalence Mappings.
Code History
Similar Procedure Codes
Questions About 099900Z
Is 099900Z a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Drainage of Right Auditory Ossicle with Drainage Device, Open Approach on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 099900Z mean?
The code breaks down character by character: the 1st character 0 is the Section (Medical and Surgical); the 2nd character 9 is the Body System (Ear, Nose, Sinus); the 3rd character 9 is the Operation (Drainage); the 4th character 9 is the BodyPart (Auditory Ossicle, Right); the 5th character 0 is the Approach (Open); the 6th character 0 is the Device (Drainage Device); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 099900Z group to?
On an inpatient stay, Drainage of Right Auditory Ossicle with Drainage Device, Open Approach maps to MS-DRGs 143, 144, 145, with relative weights from 1.2335 to 3.8500. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 099900Z?
Under the General Equivalence Mappings, Drainage of Right Auditory Ossicle with Drainage Device, Open Approach crosswalks to ICD-9-PCS 19.3 (Other operations on ossicular chain). The mapping is approximate, so confirm it fits the documentation.
