Procedure Coding:
56633 - Radical vulvectomy (removal of >80%), including deep subcutaneous tissue Documentation supports greater than 80% vulvar removal Deep tissue involvement confirms radical procedure Diagnosis Coding:
D07.1 - Carcinoma in situ of vulva
VIN III = high-grade squamous intraepithelial lesion
Classified as carcinoma in situ, not benign dysplasia
Why Other Options Are Incorrect:
56620 / 56625 / 56630 - Partial or simple vulvectomy
N90.1 - Mild vulvar dysplasia (incorrect severity)
ICD-10-CM Official Guideline:
VIN III is coded as D07.1, not N90.x.

ICD-10-CM has a clear hierarchy when the same substance is documented with multiple levels of severity.
Dependencerepresents a higher severity classification thanabuse, andabuseis higher thanuse. When two or more of these are documented for the same substance, you generally assignonly one code, selecting thehighest level of severitysupported: dependence over abuse, and abuse over use. Therefore, if bothuse and dependenceare documented, you assigndependence only(Option D). Option A is incorrect because you do not code both use and abuse for the same substance; you choose the higher severity (abuse). Option B is incorrect because if abuse and dependence are both documented, you would codedependence, not abuse. Option C is incorrect because ICD-10-CM does not support reporting all three separately for the same substance; doing so would be duplicative and noncompliant. CPC exam tip: remember the mnemonicD-A-U#Dependence > Abuse > Use(pick the highest).

00537 = Anesthesia for EP procedures
P1 = Normal healthy patient

52352 = Cystourethroscopy with ureteroscopy, removal of calculus with manipulation (basket)
52353 is for laser lithotripsy
52356 includes stent placement (not performed)

The procedure described involves a LeFort I reconstruction, which is a type of orthognathic surgery performed to correct deformities of the midface. In this scenario, the surgeon performed the reconstruction in two pieces, moving the upper jawbone forward and repositioning the teeth of the maxilla. According to the CPT guidelines, CPT code 21146 describes a LeFort I (maxilla only) osteotomy, two-piece segment, including bone grafts (includes obtaining autografts). This code matches the description provided.
References:
* AMA's CPT Professional Edition (current year), Code 21146