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Non-billableLymphoid leukemia
C91 is the ICD-10-CM code for Lymphoid leukemia. It is a non-billable category code — use a more specific child code such as C91.0 for billing.
- Status
- Header (non-billable)
- Chapter
- C00-D49
- Subcodes
- 9
- Edition
- FY2026
C00-D49 Neoplasms
What this means — in plain language
MedlinePlus · NIHWhat is leukemia? Leukemia is a term for cancers of the blood cells. Leukemia starts in blood-forming tissues such as the bone marrow. Your bone marrow makes the cells which will develop into white blood cells, red blood cells, and platelets. Each type of cell has a different job: White blood cells help your body fight infection Red blood cells deliver oxygen from your lungs to your tissues and organs Platelets help…
Read more about Acute Lymphocytic Leukemia at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
- •personal history of leukemia (Z85.6)
Medications indicated for this condition
FDA labeling- MethylprednisoloneCorticosteroid [EPC]›
- PrednisoneCorticosteroid [EPC]›
- Bendamustine›
- Doxorubicin›
- Imatinib›
- MethotrexateFolate Analog Metabolic Inhibitor [EPC]›
- Dasatinib›
- CyclophosphamideAlkylating Drug [EPC]›
- CytarabineNucleoside Metabolic Inhibitor [EPC]›
- Marcaine, Lidocaine, Kenalog, Povidone Iodine›
- Mercaptopurine›
- NelarabineNucleoside Metabolic Inhibitor [EPC]›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
19 rare diseases filed under this code
Orphanet · INSERMICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. This code is shared — showing 12 of 19.
Orphadata Science: Free access data from Orphanet. © INSERM 1999. 2 of these are exact ICD-10 matches; the rest are broader-bucket mappings.
Frequently asked questions
- What is ICD-10 code C91?
- C91 is the ICD-10-CM code for "Lymphoid leukemia". It falls under C00-D49 Neoplasms.
- Is C91 a billable code?
- No — C91 is a non-billable header code. Use a more specific child code (such as C91.0) for billing.
- What is excluded from C91?
- Excludes1 (not coded here): personal history of leukemia (Z85.6).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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