099C80ZDrainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic

Medical and Surgical›Ear, Nose, Sinus›Drainage
  • Billable / Specific Code
ICD-10-PCS 099C80Z
CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.FacebookXLinkedInPrint

099C80Z is a billable ICD-10-PCS procedure code for Drainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The root operation Drainage involves taking or letting out fluids and/or gases from a body part.

Code Identity

ICD-10-PCS Code
099C80Z
Billable Status
Yes — Valid for Submission
Code Describes
Drainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic
Parent Code
099
Short Description
Drainage of Left Mastoid Sinus with Drainage Device, Endo

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.

PositionDesignationValueMeaning
1Section0Medical and Surgical
2Body System9Ear, Nose, Sinus
3Operation9Drainage
4BodyPartCMastoid Sinus, Left
5Approach8Via Natural or Artificial Opening Endoscopic
6Device0Drainage Device
7QualifierZNo Qualifier

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for 099C80Z under the General Equivalence Mappings.

99.99
Approximate match.

Code History

Replaces previously assigned code(s):
  • 099C40Z — Drain of L Mastoid Sinus with Drain Dev, Perc Endo Approach

Similar Procedure Codes

Questions About 099C80Z

Is 099C80Z a billable code?

Yes. 099C80Z is a complete seven-character ICD-10-PCS code, specific enough to report Drainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic on inpatient claims from October 1, 2025 through September 30, 2026.

What do the characters in 099C80Z mean?

099C80Z 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 8 is the Approach (Via Natural or Artificial Opening Endoscopic); the 6th character 0 is the Device (Drainage Device); the 7th character Z is the Qualifier (No Qualifier).

What is the ICD-9-PCS equivalent of 099C80Z?

Under the General Equivalence Mappings, Drainage of Left Mastoid Sinus with Drainage Device, Via Natural or Artificial Opening Endoscopic crosswalks to ICD-9-PCS 99.99. The mapping is approximate, so confirm it fits the documentation.