099B0ZX ICD-10-PCS Code: Drainage of Right Mastoid Sinus, Open Approach, Diagnostic
Axis Breakdown
Every ICD-10-PCS code is exactly seven characters, one per axis. Each character's meaning is defined by its position in the code.
| Position | Value | Meaning |
|---|---|---|
| 1 | Section0 | Medical and Surgical |
| 2 | Body System9 | Ear, Nose, Sinus |
| 3 | Root Operation9 | Drainage Taking or letting out fluids and/or gases from a body part |
| 4 | Body PartB | Mastoid Sinus, Right |
| 5 | Approach0 | Open |
| 6 | DeviceZ | No Device |
| 7 | QualifierX | Diagnostic |
MS-DRG Grouper Relationships (FY2027)
Potential MS-DRG participation — not a DRG assignment.
The MS-DRG grouper treats this as an operating room procedure. It appears in the surgical logic of 3 MS-DRGs:
From the CMS MS-DRG Definitions Manual, Appendix E. Actual DRG assignment depends on the complete claim.
Related Codes
Same operation — other Body Part
Same table and root operation, differing only in the body part character.
09970ZX — Drainage of Right Tympanic Membrane, Open Approach, Diagnostic, 09980ZX — Drainage of Left Tympanic Membrane, Open Approach, Diagnostic, 09990ZX — Drainage of Right Auditory Ossicle, Open Approach, Diagnostic, 099A0ZX — Drainage of Left Auditory Ossicle, Open Approach, Diagnostic, 099C0ZX — Drainage of Left Mastoid Sinus, Open Approach, Diagnostic, 099D0ZX — Drainage of Right Inner Ear, Open Approach, Diagnostic, 099E0ZX — Drainage of Left Inner Ear, Open Approach, Diagnostic, 099F0ZX — Drainage of Right Eustachian Tube, Open Approach, Diagnostic, +20 more
Same operation — other Approach
Same table and root operation, differing only in the approach character.
099B3ZX — Drainage of Right Mastoid Sinus, Percutaneous Approach, Diagnostic, 099B4ZX — Drainage of Right Mastoid Sinus, Percutaneous Endoscopic Approach, Diagnostic, 099B7ZX — Drainage of Right Mastoid Sinus, Via Natural or Artificial Opening, Diagnostic, 099B8ZX — Drainage of Right Mastoid Sinus, Via Natural or Artificial Opening Endoscopic, Diagnostic
Same operation — other Qualifier
Same table and root operation, differing only in the qualifier character.
099B0ZZ — Drainage of Right Mastoid Sinus, Open Approach
Same procedure category (CCSR), other tables
AHRQ's Clinical Classifications Software Refined groups these ICD-10-PCS procedures with this one under ENT diagnostic procedures (non-endoscopic) (Ear, Nose, and Throat Procedures); listed here are the members in other PCS tables. Source: Clinical Classifications Software Refined (CCSR), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, November 2025.
09B00ZX — Excision of Right External Ear, Open Approach, Diagnostic, 09B03ZX — Excision of Right External Ear, Percutaneous Approach, Diagnostic, 09B04ZX — Excision of Right External Ear, Percutaneous Endoscopic Approach, Diagnostic, 09B0XZX — Excision of Right External Ear, External Approach, Diagnostic, 09B10ZX — Excision of Left External Ear, Open Approach, Diagnostic, 09B13ZX — Excision of Left External Ear, Percutaneous Approach, Diagnostic, 09B14ZX — Excision of Left External Ear, Percutaneous Endoscopic Approach, Diagnostic, 09B1XZX — Excision of Left External Ear, External Approach, Diagnostic, 09B30ZX — Excision of Right External Auditory Canal, Open Approach, Diagnostic, 09B33ZX — Excision of Right External Auditory Canal, Percutaneous Approach, Diagnostic, 09B34ZX — Excision of Right External Auditory Canal, Percutaneous Endoscopic Approach, Diagnostic, 09B37ZX — Excision of Right External Auditory Canal, Via Natural or Artificial Opening, Diagnostic, 09B3XZX — Excision of Right External Auditory Canal, External Approach, Diagnostic, 09B40ZX — Excision of Left External Auditory Canal, Open Approach, Diagnostic, 09B43ZX — Excision of Left External Auditory Canal, Percutaneous Approach, Diagnostic, 09B44ZX — Excision of Left External Auditory Canal, Percutaneous Endoscopic Approach, Diagnostic, 09B47ZX — Excision of Left External Auditory Canal, Via Natural or Artificial Opening, Diagnostic, 09B4XZX — Excision of Left External Auditory Canal, External Approach, Diagnostic, 09B50ZX — Excision of Right Middle Ear, Open Approach, Diagnostic, 09B60ZX — Excision of Left Middle Ear, Open Approach, Diagnostic, +331 more
Contextual Map
Every relationship of 099B0ZX in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Run 099B0ZX with these 5 related codes in Claim Check
PCS table
- 099[PCS table]— CMS ICD-10-PCS tables
- Medical and Surgical — Section: Medical and Surgical[Section]: “Medical and Surgical”— CMS ICD-10-PCS tables
- Ear, Nose, Sinus — Body System: Ear, Nose, Sinus[Body System]: “Ear, Nose, Sinus”— CMS ICD-10-PCS tables
- Drainage — Operation: Drainage[Operation]: “Drainage”— CMS ICD-10-PCS tables
MS-DRG participation
- DRG 143 — OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITH MCC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITH MCC — Other Ear, Nose, Mouth and Throat O.R. Procedures (MDC 03)”— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- DRG 144 — OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITH CC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITH CC — Other Ear, Nose, Mouth and Throat O.R. Procedures (MDC 03)”— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
- DRG 145 — OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITHOUT CC/MCC[MS-DRG]: “OTHER EAR, NOSE, MOUTH AND THROAT O.R. PROCEDURES WITHOUT CC/MCC — Other Ear, Nose, Mouth and Throat O.R. Procedures (MDC 03)”— CMS MS-DRG Definitions Manual (Appendix E) · FY2027
Clinical classification (CCSR)
- ENT003 — ENT diagnostic procedures (non-endoscopic)[CCSR category]: “ENT diagnostic procedures (non-endoscopic) — Ear, Nose, and Throat Procedures”— AHRQ CCSR for ICD-10-PCS Procedures (HCUP) · v2026.1
MDC crossing · diagnoses (1449)
- MDC 03 — Diseases and Disorders of the Ear, Nose, Mouth and Throat[MDC crossing]: “Diseases and Disorders of the Ear, Nose, Mouth and Throat — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027
- A18.6 — Tuberculosis of (inner) (middle) ear[Same-MDC diagnosis]: “Tuberculosis of (inner) (middle) ear — grouped in MDC 03, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.0 — Pharyngeal diphtheria[Same-MDC diagnosis]: “Pharyngeal diphtheria — grouped in MDC 03, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.1 — Nasopharyngeal diphtheria[Same-MDC diagnosis]: “Nasopharyngeal diphtheria — grouped in MDC 03, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A36.2 — Laryngeal diphtheria[Same-MDC diagnosis]: “Laryngeal diphtheria — grouped in MDC 03, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A54.5 — Gonococcal pharyngitis[Same-MDC diagnosis]: “Gonococcal pharyngitis — grouped in MDC 03, the diagnosis side of this code's crossing.”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 1444 more
Nearest codes
- 09900ZX — Drainage of Right External Ear, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09910ZX — Drainage of Left External Ear, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09930ZX — Drainage of Right External Auditory Canal, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09940ZX — Drainage of Left External Auditory Canal, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09950ZX — Drainage of Right Middle Ear, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09960ZX — Drainage of Left Middle Ear, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09970ZX — Drainage of Right Tympanic Membrane, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
- 09980ZX — Drainage of Left Tympanic Membrane, Open Approach, Diagnostic[One axis away]— CMS ICD-10-PCS tables
Change history
No changes recorded for this code. This ledger tracks additions, deletions and description changes from FY2016 onward. Note changes are not tracked.
Read from: CMS ICD-10-PCS code tables, index and definitions — FY2027; CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44; AHRQ HCUP Clinical Classifications Software Refined for ICD-10-PCS Procedures (hcup-us.ahrq.gov/toolssoftware/ccsr/PRCCSR_v2026-1.zip) — v2026.1. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources