Excludes1 pair
C92- vs D47.1
C92 and D47.1 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 D47.1
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
D47.1
Chronic myeloproliferative disease
Billable
- Chapter 2
- Neoplasms
- Section
- D37-D48
Use when the record says
- Chronic neutrophilic leukemia
- Myeloproliferative disease, unspecified
Indexed under
- Disease, diseased › myeloproliferative
- Leukemia, leukemic › chronic neutrophilic
- Myelofibrosis › primary
- Myelosis › chronic
- Syndrome › myeloproliferative (chronic)
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