Excludes1 pair
C83.7- vs C91-
C83.7 and C91 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
The official note, declared on C83.7
mature B-cell leukemia Burkitt type (C91.A-)
C83.7
Burkitt lymphoma
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- Atypical Burkitt lymphoma
- Burkitt-like lymphoma
Indexed under
- Burkitt › lymphoma (malignant)
- Burkitt › tumor
- Lymphoma › Burkitt (atypical)
- Lymphoma › Burkitt-like
- Burkitt › lymphoma › small noncleaved, diffuse
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