C83 vs C88.4
C83 and C88.4 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 C88.4
high malignant (diffuse large B-cell) lymphoma (C83.3-)
C88.4
Extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue [MALT-lymphoma]
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- Lymphoma of skin-associated lymphoid tissue [SALT-lymphoma]
- Lymphoma of bronchial-associated lymphoid tissue [BALT-lymphoma]
Indexed under
- Lymphoma › BALT (of) (malignant)
- Lymphoma › bronchial-associated lymphoid tissue [BALT-lymphoma] (of) (malignant)
- Lymphoma › extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue [MALT-lymphoma] (of) (malignant)
- Lymphoma › MALT (of) (malignant)
- Lymphoma › mucosa-associated lymphoid tissue [MALT-lymphoma] (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