2025 ICD-10-CM Procedure Code 099C8ZZ
Drainage of Left Mastoid Sinus, Via Natural or Artificial Opening Endoscopic
- ICD-10-PCS Code:
- 099C8ZZ
- ICD-10-PCS Code for:
- Drainage of Left Mastoid Sinus, Endo
- Is Billable?
- Yes - Valid for Submission
- Code Navigator:
099C8ZZ is a billable procedure code used to specify the performance of drainage of left mastoid sinus, via natural or artificial opening endoscopic. The code is valid for the year 2025 for the submission of HIPAA-covered transactions. The procedure code involves taking or letting out fluids and/or gases from a body part. Procedure code explanation: the qualifier diagnostic is used to identify drainage procedures that are biopsies thoracentesis, incision and drainage
099C8ZZ PCS Table
In an PCS table each code is represented by up seven alphanumeric characters, with each character in the table respresenting different aspects of the procedure. In the table provided below, each row represents an individual character and includes information about the character's position, designation, label, and procedure notes. For this PCS table the procedure code is in the medical and surgical section and is part of the ear, nose, sinus body system, classified under drainage operation. The applicable bodypart for this procedure code is mastoid sinus, left.
| Position | Designation | Character | Label | Procedures Notes |
|---|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical | |
| 2 | Body System | 9 | Ear, Nose, Sinus | |
| 3 | Operation | 9 | Drainage | Involves: Explanation:
|
| 4 | BodyPart | C | Mastoid Sinus, Left | Includes:
|
| 5 | Approach | 8 | Via Natural or Artificial Opening Endoscopic | Involves: |
| 6 | Device | Z | No Device | Explanation: |
| 7 | Qualifier | Z | No Qualifier | Explanation: |
Replacement Code
099C8ZZ replaces the following previously assigned ICD-10-PCS code(s):
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
- 099C4ZZ - Drainage of Left Mastoid Sinus, Perc Endo Approach
Clinical Classification
ENT drainage (excluding myringotomy)
CCSR Code: ENT006
Clinical Domain: Ear, Nose, and Throat Procedures ENT contains 17 categories that include procedures performed on the ear, nose, and throat (ENT) as well as the head and neck, such as myringotomy, frenectomy, and tonsillectomy as well as diagnostic audiology.
Convert to ICD-9-PCS
Below are the ICD-9=PCS code(s) that most closely match this ICD-10-PCS code, based on the General Equivalence Mappings (GEMs). This ICD-10-PCS to ICD-9-PCS crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.
ICD-9-PCS Code
Code: 9999
Approximate Flag: This is an approximate match. The ICD-9-PCS code reflects a close but not exact equivalent of the ICD-10-PCS procedure.
Other ICD-10-PCS Codes Used for Drainage Mastoid Sinus, Left
What is ICD-10-PCS?
The ICD-10 Procedure Coding System (ICD-10-PCS) is a catalog of procedural codes used by medical professionals for hospital inpatient healthcare settings. The Centers for Medicare and Medicaid Services (CMS) maintain the catalog in the U.S. releasing yearly updates. The 2025 ICD-10-PCS codes are to be used for discharges occurring from October 1, 2024 through September 30, 2025.
Each ICD-10-PCS code has a structure of seven alphanumeric characters and contains no decimals. The first character defines the major "section". Depending on the "section" the second through seventh characters mean different things.
