Summary & Overview
CPT 69670: Mastoid Obliteration to Prevent or Stop CSF Leak
CPT code 69670 represents mastoid obliteration, a distinct otologic surgical procedure in which a lining is placed in the mastoid cavity after removal of residual diseased tissue to prevent or stop a cerebrospinal fluid (CSF) leak. Nationally, this code matters because it captures a targeted, complication-focused intervention performed after initial mastoidectomy and has implications for surgical coding accuracy, post-operative complication management, and facility resource use.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for the procedure, typical sites of service (hospital operating room and ambulatory surgical center), and the distinct billing posture of this code as a separately reportable procedure following mastoidectomy. The publication supplies benchmarking context where available, highlights relevant policy and coding considerations that affect claim adjudication, and outlines clinical scenarios in which the procedure is typically performed (management of residual disease and CSF leak prevention). Data not available in the input will be noted as such in detailed tables. This summary is designed for clinicians, coding professionals, and payers seeking a clear, nationally relevant reference for CPT code 69670.
Billing Code Overview
CPT code 69670 describes a mastoid obliteration, performed when the provider places a lining in the mastoid cavity after removing remaining diseased tissue. The procedure is documented as a separately performed service distinct from the initial mastoidectomy and is specifically performed to prevent or stop a cerebrospinal fluid leak.
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Service type: Surgical otologic procedure (mastoid cavity obliteration)
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Typical site of service: Hospital operating room or ambulatory surgical center, performed by an otolaryngologist (ENT) specializing in ear surgery
Clinical & Coding Specifications
Clinical Context
A 54-year-old male presents with chronic mastoiditis and a persistent cerebrospinal fluid (CSF) otorrhea following prior canal-wall-up mastoidectomy and tympanomastoid surgery. After diagnostic imaging and otologic evaluation, the otologic surgeon determines residual diseased mastoid air cells and a persistent CSF leak from a petrous dural defect. In the operating room under general anesthesia, the surgeon removes remaining diseased tissue from the mastoid cavity, identifies the dural defect, and performs a mastoid obliteration by placing a biologic lining and packing material to seal the cavity and stop the CSF leak. The procedure is performed as a separate, distinct service from the original mastoidectomy and is documented as a standalone obliteration to prevent recurrent CSF leakage and recurrent infection. Typical workflow includes preoperative imaging (CT temporal bones), intraoperative identification and debridement of disease, repair or reinforcement of the dural defect, placement of obliterative material, and postoperative otologic follow-up with wound checks and imaging as indicated. The typical site of service is the hospital operating room, and the procedure is billed as a distinct surgical service when performed after or separate from the initial mastoidectomy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the mastoid obliteration requires substantially greater work or complexity than typical and documentation supports unusual effort. |