2025 ICD-10-CM Procedure Code 099B0ZZ

Drainage of Right Mastoid Sinus, Open Approach

ICD-10-PCS Code:: 099B0ZZ
ICD-10-PCS Code for:: Drainage of Right Mastoid Sinus, Open Approach
Is Billable?: Yes - Valid for Submission
Code Navigator:

099B0ZZ is a billable procedure code used to specify the performance of drainage of right mastoid sinus, open approach. 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

Table of Contents

Code Information
PCS Table
Clinical Classification
Diagnostic Related Groups Mapping
Convert to ICD-9-PCS
Other Similar Codes

099B0ZZ 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, right.

Position	Designation	Character	Label	Procedures Notes
1	Section	0	Medical and Surgical
2	Body System	9	Ear, Nose, Sinus
3	Operation	9	Drainage	Involves: Taking or letting out fluids and/or gases from a body part Explanation: The qualifier DIAGNOSTIC is used to identify drainage procedures that are biopsies Includes: Thoracentesis, incision and drainage
4	BodyPart	B	Mastoid Sinus, Right	Includes: Mastoid air cells
5	Approach	0	Open	Involves: Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure
6	Device	Z	No Device	Explanation: The value Z is used for the sixth character to indicate that a specific device does not apply to the procedure.
7	Qualifier	Z	No Qualifier	Explanation: The value Z is used for the seventh character to indicate that a specific qualifier does not apply to the procedure.

Clinical Classification

Clinical Category is ENT drainage (excluding myringotomy)
CCSR Category Code: ENT006
Clinical Domain is 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.

099B0ZZ is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together procedures for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on the primary procedure being performed. Once a patient is assigned a particular group, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care associated with a particular procedure. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The procedure code 099B0ZZ is present in the following groups for version MS-DRG V42.0 applicable from 10/01/2024 through 09/30/2025.

MS-DRG	MS-DRG Title	MCD	Relative Weight
135	Sinus and Mastoid Procedures with CC/MCC	03
136	Sinus and Mastoid Procedures without CC/MCC	03

Convert to ICD-9-PCS

The following crosswalk between ICD-10-PCS to ICD-9-PCS is based based on the General Equivalence Mappings (GEMS) information:

ICD-9-PCS: 2021 (Approximate Flag) Approximate Flag
The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
ICD-9-PCS: 2022 (Approximate Flag) Approximate Flag
The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.

Other ICD-10-PCS Codes Used for Drainage Mastoid Sinus, Right

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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.