Excludes1 pair
C84.7- vs C86-
C84.7 and C86 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 C84.7
primary cutaneous CD30-positive T-cell proliferations (C86.6-)
C84.7
Anaplastic large cell lymphoma, ALK-negative
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Indexed under
- Lymphoma › anaplastic large cell › ALK-negative
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