D07.1 vs N90.1
D07.1 and N90.1 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on D07.1
moderate dysplasia of vulva (N90.1)
D07.1
Carcinoma in situ of vulva
Billable
- Chapter 2
- Neoplasms
- Section
- D00-D09
Use when the record says
- Severe dysplasia of vulva
- Vulvar intraepithelial neoplasia III [VIN III]
Indexed under
- Dysplasia › vulva › severe NEC
- Neoplasia › intraepithelial › vulva › grade III
N90.1
Moderate vulvar dysplasia
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N80-N98
Use when the record says
- Vulvar intraepithelial neoplasia [VIN], grade II
Indexed under
- Dysplasia › vulva › moderate
- Neoplasia › intraepithelial › vulva › grade II
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027