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Official Description

Myelofibrosis
Myelofibrosis NOS
Secondary myelofibrosis
Code first the underlying disorder, such as: malignant neoplasm of breast (174.0-174.9, 175.0-175.9)
Excludes: idiopathic myelofibrosis (238.76), leukoerythroblastic anemia (284.2), myelofibrosis with myeloid metaplasia (238.76), myelophthisic anemia (284.2), myelophthisis (284.2), primary myelofibrosis (238.76)
Use additional code for associated therapy-related myelodysplastic syndrome, if applicable (238.72, 238.73)
Use additional external cause code if due to anti-neoplastic chemotherapy (E933.1)
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