099C40ZDrainage of Left Mastoid Sinus with Drainage Device, Percutaneous Endoscopic Approach
- Billable / Specific Code
099C40Z is a billable ICD-10-PCS procedure code for Drainage of Left Mastoid Sinus with Drainage Device, Percutaneous Endoscopic Approach. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRGs 135, 136. The root operation Drainage involves taking or letting out fluids and/or gases from a body part.
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 | C | Mastoid Sinus, Left |
| 5 | Approach | 4 | Percutaneous Endoscopic |
| 6 | Device | 0 | Drainage Device |
| 7 | Qualifier | Z | No Qualifier |
Convert to ICD-9-PCS
Closest ICD-9-PCS equivalents for 099C40Z under the General Equivalence Mappings.
Code History
- 099C80Z — Drainage of Left Mastoid Sinus with Drainage Device, Endo
Similar Procedure Codes
Questions About 099C40Z
Is 099C40Z a billable code?
Yes. 099C40Z is a complete seven-character ICD-10-PCS code, specific enough to report Drainage of Left Mastoid Sinus with Drainage Device, Percutaneous Endoscopic Approach on inpatient claims from October 1, 2025 through September 30, 2026.
What do the characters in 099C40Z mean?
099C40Z 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 C is the BodyPart (Mastoid Sinus, Left); the 5th character 4 is the Approach (Percutaneous Endoscopic); the 6th character 0 is the Device (Drainage Device); the 7th character Z is the Qualifier (No Qualifier).
What MS-DRG does 099C40Z group to?
On an inpatient stay, Drainage of Left Mastoid Sinus with Drainage Device, Percutaneous Endoscopic Approach maps to MS-DRGs 135, 136, with relative weights from 1.0153 to 2.1152. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 099C40Z?
Under the General Equivalence Mappings, Drainage of Left Mastoid Sinus with Drainage Device, Percutaneous Endoscopic Approach crosswalks to ICD-9-PCS 20.21 and 20.22. The mapping is approximate, so confirm it fits the documentation.
