Excludes1 pair
C92- vs C92.1-
C92 and C92.1 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 C92.1
atypical chronic myeloid leukemia BCR/ABL-negative (C92.2-)
C92
Myeloid leukemia
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- granulocytic leukemia
- myelogenous leukemia
C92.1
Chronic myeloid leukemia, BCR/ABL-positive
Not billable
- Chapter 2
- Neoplasms
- Section
- C81-C96
Use when the record says
- Chronic myelogenous leukemia, Philadelphia chromosome (Ph1) positive
- Chronic myelogenous leukemia, t(9;22) (q34;q11)
- Chronic myelogenous leukemia with crisis of blast cells
Indexed under
- Leukemia, leukemic › chronic myelogenous (Philadelphia chromosome (Ph1) positive) (t(9;22)) (q34;q11) (with crisis of blast cells)
- Leukemia, leukemic › chronic myeloid, BCR/ABL-positive
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