AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2025 Issue 3; Ask the Editor

Methyl Methacrylate (MMA) Cranioplasty

A patient underwent microvascular decompression of the right trigeminal nerve root with methyl methacrylate (MMA) cranioplasty. During surgery, a burr hole was created and enlarged to perform a triangular craniectomy, followed by decompression of the trigeminal nerve root. The MMA cranioplasty was performed to reconstitute the lateral suboccipital, the posterior mastoid process, and the mastoid groove in an anatomic fashion. Is a separate code assigned for the MMA cranioplasty or is this considered a procedural step necessary to close the operative site and not coded separately? If coded, what is the appropriate root operation for the MMA cranioplasty? ...

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