D06 vs N87.1
D06 and N87.1 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 D06
cervical intraepithelial neoplasia II [CIN II] (N87.1)
D06
Carcinoma in situ of cervix uteri
Not billable
- Chapter 2
- Neoplasms
- Section
- D00-D09
Use when the record says
- cervical adenocarcinoma in situ
- cervical intraepithelial glandular neoplasia
- cervical intraepithelial neoplasia III [CIN III]
- severe dysplasia of cervix uteri
N87.1
Moderate cervical dysplasia
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N80-N98
Use when the record says
- Cervical intraepithelial neoplasia II [CIN II]
Indexed under
- Dysplasia › cervix › moderate
- Neoplasia › intraepithelial › cervix › 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