C84.7 vs C86
C84.7 and C86 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 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 (of) (malignant)
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