Excludes1 pair
C83.3- vs C84-
C83.3 and C84 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 C83.3
mature T/NK-cell lymphomas (C84.-)
C83.3
Diffuse large B-cell lymphoma
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- Anaplastic diffuse large B-cell lymphoma
- CD30-positive diffuse large B-cell lymphoma
- Centroblastic diffuse large B-cell lymphoma
- Diffuse large B-cell lymphoma, subtype not specified
- Immunoblastic diffuse large B-cell lymphoma
- Plasmablastic diffuse large B-cell lymphoma
- T-cell rich diffuse large B-cell lymphoma
Indexed under
- Lymphoma › diffuse large cell
- Lymphoma › diffuse large cell › anaplastic
- Lymphoma › diffuse large cell › B-cell
- Lymphoma › diffuse large cell › CD30-positive
- Lymphoma › diffuse large cell › centroblastic
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