AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2023 Issue 2; Ask the Editor

Sigmoid Sinus Dehiscence with Mastoidectomy with Resurfacing

A 33-year-old patient presents with right pulsatile tinnitus due to dehiscence of the sigmoid sinus. Computed tomography angiography revealed that the sigmoid sinus had grown through the bone to the periosteum. ICD-10-CM does not provide a specific code for sigmoid sinus dehiscence. Would this condition be classified as a bone defect since the sigmoid sinus dehisced through the bone or as a vascular condition? What is the appropriate ICD-10-CM code assignment for the sigmoid sinus dehiscence? ...

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