Excludes1 pair
C83.8- vs C85-
C83.8 and C85 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
mediastinal (thymic) large B-cell lymphoma (C85.2-)
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
C85
Other specified and unspecified types of non-Hodgkin lymphoma
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
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