099P0ZXDrainage of Accessory Sinus, Open Approach, Diagnostic
- Billable / Specific Code
099P0ZX is a billable ICD-10-PCS procedure code for Drainage of Accessory Sinus, Open Approach, Diagnostic. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRGs 135, 136. 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 diagnostic procedures (non-endoscopic).
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 | P | Accessory Sinus |
| 5 | Approach | 0 | Open |
| 6 | Device | Z | No Device |
| 7 | Qualifier | X | Diagnostic |
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 accessory sinus, open the FY 2027 ICD-10-PCS Alphabetic Index at Drainage, then the subterms Sinus, Accessory. The index leads to table 099, where the approach, device and qualifier values shown in the breakdown above complete the seven-character code 099P0ZX.
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.
Similar Procedure Codes
Questions About 099P0ZX
Is 099P0ZX a billable code?
Yes. This is a complete seven-character ICD-10-PCS code, specific enough to report Drainage of Accessory Sinus, Open Approach, Diagnostic on inpatient claims from October 1, 2026 through September 30, 2027.
What do the characters in 099P0ZX 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 P is the BodyPart (Accessory Sinus); the 5th character 0 is the Approach (Open); the 6th character Z is the Device (No Device); the 7th character X is the Qualifier (Diagnostic).
What MS-DRG does 099P0ZX group to?
On an inpatient stay, Drainage of Accessory Sinus, Open Approach, Diagnostic maps to MS-DRGs 135, 136, with relative weights from 1.0615 to 2.1793. The MS-DRG sets the fixed Medicare payment for the stay.
What is the ICD-9-PCS equivalent of 099P0ZX?
Under the General Equivalence Mappings, Drainage of Accessory Sinus, Open Approach, Diagnostic crosswalks to ICD-9-PCS 22.12 (Open biopsy of nasal sinus). The mapping is approximate, so confirm it fits the documentation.
