C83.8 vs C85
C83.8 and C85 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 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 (of) (malignant)
- Lymphoma › primary effusion B-cell (of) (malignant)
- Lymphoma › non-follicular › specified NEC (of) (malignant)
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