0NB54ZX
Excision Temporal Bone, Right to Diagnostic with No Device, Percutaneous Endoscopic Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | N Head and Facial Bones |
| Operation | B Excision |
| Body Part | 5 Temporal Bone, Right |
| Approach | 4 Percutaneous Endoscopic |
| Device | Z No Device |
| Qualifier | X Diagnostic |
Operation Definition
Cutting out or off, without replacement, a portion of a body part
Procedure Overview
Excision procedures remove a portion of a skull or facial bone without replacing it, typically to obtain a tissue sample for diagnosis or to eliminate a localized area of diseased or abnormal bone. A surgeon cuts away the affected segment while leaving the rest of the bone intact, distinguishing this from procedures that remove an entire bone or joint. The removed piece may be sent to pathology to confirm whether a lesion is benign or malignant, or it may be taken simply because the bone itself is infected, fractured beyond repair in that spot, or overgrown.
This family covers situations ranging from a small biopsy of a suspicious jaw lesion to excising a section of skull affected by chronic osteomyelitis or a benign tumor such as an osteoma. Facial bone excisions are also performed to correct congenital deformities or to remove bone that is compressing a nerve or interfering with normal function. Because the skull and face have limited soft-tissue coverage in places, surgeons plan these excisions carefully to preserve surrounding structures like nerves, sinuses, and the dura covering the brain.
Anatomy & Axis Detail
Temporal Bone, Right
The right temporal bone is one of the most anatomically complex bones in the skull, housing the middle and inner ear structures, the facial nerve canal, and forming part of the skull base, so excision of a portion of it is a highly specialized procedure typically performed for lesions such as a cholesteatoma eroding bone, a temporal bone tumor, or osteomyelitis, rather than routine biopsy. Because the facial nerve, ossicles, and structures related to hearing and balance run through or adjacent to this bone, even a limited excision demands precise localization using imaging and often intraoperative monitoring to avoid injury to these structures. The right-sided designation is essential given the bone's role in unilateral hearing and facial nerve function, and documentation should specify the portion of temporal bone involved.
Approach: Percutaneous Endoscopic
Percutaneous Endoscopic combines a puncture through skin or mucous membrane with insertion of an endoscope to visualize the procedure internally, as in laparoscopic cholecystectomy. It is distinguished from plain Percutaneous by the presence of scope-guided visualization, and from Via Natural or Artificial Opening Endoscopic by its route being a new puncture rather than an existing orifice or stoma.
Qualifier: Diagnostic
Applied chiefly to Excision, this qualifier marks that tissue was removed specifically for diagnostic purposes, i.e., a biopsy intended for pathologic evaluation rather than to treat disease. It distinguishes biopsy-type excisions from therapeutic excisions of the same body part, which are coded without this qualifier even though the physical technique may be identical.
Coding & Documentation
Coders should look for clear documentation that only part of the bone was removed, since excision of an entire bone or a specific named part in total corresponds to Resection rather than Excision. The pathology report and operative note together typically establish whether a biopsy excision was diagnostic or therapeutic, though the root operation is the same either way. A common assignment mistake is selecting Excision when the documentation actually describes a craniectomy performed to access the brain rather than to remove diseased bone, in which case the bone opening may be incidental to a different procedure performed on a different body system. Coders should also confirm the specific facial bone involved, since the body system table for Head and Facial Bones lists distinct values for structures like the mandible, maxilla, orbit, and nasal bone, and picking the wrong one is a frequent error.