C91.4 Hairy cell leukemia

Non-billable header with 3 child codes.

Applicable to

• Leukemic reticuloendotheliosis

Applies from C91 Lymphoid leukemia

Excludes1 (never code together)

• personal history of leukemia (Z85.6)

Codes under C91.4

• C91.40 Hairy cell leukemia not having achieved remission
• C91.41 Hairy cell leukemia, in remission
• C91.42 Hairy cell leukemia, in relapse

Code annotations containing back-references to C91.4

Back-references to C91.4

• Type 1 Excludes: C94 Other leukemias of specified cell type ("leukemic reticuloendotheliosis (C91.4-)")
• Type 1 Excludes: D61.81 Pancytopenia ("pancytopenia (due to) (with) hairy cell leukemia (C91.4-)")
• Type 1 Excludes: D76 Other specified diseases with participation of lymphoreticular and reticulohistiocytic tissue ("leukemic reticuloendotheliosis (C91.4-)")

Back-references to C91

• Type 1 Excludes: C76 Malignant neoplasm of other and ill-defined sites ("malignant neoplasm of lymphoid, hematopoietic and related tissue (C81-C96)")
• Type 1 Excludes: D72.8 Other specified disorders of white blood cells ("leukemia (C91-C95)")
• Type 1 Excludes: D72.825 Bandemia ("leukemia (C91.-, C92.-, C93.-, C94.-, C95.-)")
• Code First: M36.1 Arthropathy in neoplastic disease ("leukemia (C91-C95)")
• Code First: N16 Renal tubulo-interstitial disorders in diseases classified elsewhere ("leukemia (C91-C95)")
• Code First: R50.81 Fever presenting with conditions classified elsewhere ("leukemia (C91-C95)")
• Type 1 Excludes: T66 Radiation sickness, unspecified ("leukemia (C91-C95)")
• Code First: Z15.0 Genetic susceptibility to malignant neoplasm (", if applicable, any current malignant neoplasm (C00-C75, C81-C96)")

Diagnosis Index entries for C91.4

• Leukemia, leukemic › hairy cell
• Reticuloendotheliosis › leukemic

Nearby codes

• C91.12 Chronic lymphocytic leukemia of B-cell type in relapse
• C91.3 Prolymphocytic leukemia of B-cell type
• C91.30 Prolymphocytic leukemia of B-cell type not having achieved remission
• C91.31 Prolymphocytic leukemia of B-cell type, in remission
• C91.32 Prolymphocytic leukemia of B-cell type, in relapse
• C91.4 Hairy cell leukemia (this code)
• C91.40 Hairy cell leukemia not having achieved remission
• C91.41 Hairy cell leukemia, in remission
• C91.42 Hairy cell leukemia, in relapse
• C91.5 Adult T-cell lymphoma/leukemia (HTLV-1-associated)
• C91.50 Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remission