1. Procedure and CPT® Code Selection:

The scenario describes a labial gland biopsy of the salivary gland, performed in the office with a local anesthetic. The provider made an incision in the lower labial mucosa and took tissue samples from the salivary gland for biopsy.

Code 42400 is the correct CPT® code for a biopsy of a salivary gland. This code is specific to a biopsy without a more extensive excision or major surgery, aligning perfectly with the scenario of sampling salivary gland tissue.

2. Ruling Out Other Options:

Code 42408 is for the excision of a deep lobe of a parotid gland, which is a more extensive procedure than a simple biopsy and does not apply to this case.

Code 42405 is for the removal of an entire submandibular gland, which is a full excision and not applicable here.

Code 42450 is used for the removal of a sublingual gland, not for a biopsy of the labial salivary gland.

3. AAPC and CPT® Coding Guidelines:

AAPC and CPT® guidelines direct coders to use 42400 for minor biopsies of salivary gland tissue, particularly when only tissue samples are taken for diagnostic purposes, as described in this case.

Based on CPT® coding guidelines, the correct answer is C. 42400.