Excludes1 pair
C83- vs C83.8-
C83 and C83.8 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 C83.8
T-cell rich B-cell lymphoma (C83.3-)
C83.8
Other non-follicular lymphoma
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- Intravascular large B-cell lymphoma
- Lymphoid granulomatosis
- Primary effusion B-cell lymphoma
Indexed under
- Granulomatosis › lymphoid
- Lymphoma › intravascular large B-cell
- Lymphoma › primary effusion B-cell
- Lymphoma › non-follicular › specified NEC
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