Final answer:
In vulvectomy codes as defined by the CPT manual, 'partial' vulvectomy involves the removal of specific portions of the vulva, including structures such as the labia majora, and labia minora (option C).
Step-by-step explanation:
As per the CPT manual, the term partial, as it relates to vulvectomy codes, defines a procedure where specific portions of the vulva are removed. The external female reproductive structures that collectively make up the vulva include the mons pubis, labia majora, labia minora, and the vestibular glands. In a partial vulvectomy, only certain areas among these structures are excised, as opposed to a complete vulvectomy, where the entire vulva is removed.
Hence, the answer is option C.