ICD-10-CM Code C91.9

Lymphoid leukemia, unspecified

Version 2020 Non-Billable Code

Not Valid for Submission

C91.9 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of lymphoid leukemia, unspecified. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:C91.9
Short Description:Lymphoid leukemia, unspecified
Long Description:Lymphoid leukemia, unspecified

Consider the following ICD-10 codes with a higher level of specificity:

  • C91.90 - Lymphoid leukemia, unspecified not having achieved remission
  • C91.91 - ... in remission
  • C91.92 - ... in relapse

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code C91.9 are found in the index:


Clinical Information

  • LEUKEMIA LYMPHOID-. leukemia associated with hyperplasia of the lymphoid tissues and increased numbers of circulating malignant lymphocytes and lymphoblasts.
  • PRECURSOR CELL LYMPHOBLASTIC LEUKEMIA LYMPHOMA-. a neoplasm characterized by abnormalities of the lymphoid cell precursors leading to excessive lymphoblasts in the marrow and other organs. it is the most common cancer in children and accounts for the vast majority of all childhood leukemias.

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
      • Lymphoid leukemia (C91)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Acute Lymphocytic Leukemia

Leukemia is cancer of the white blood cells. White blood cells help your body fight infection. Your blood cells form in your bone marrow. In leukemia, however, the bone marrow produces abnormal white blood cells. These cells crowd out the healthy blood cells, making it hard for blood to do its work. In acute lymphocytic leukemia (ALL), also called acute lymphoblastic leukemia, there are too many of specific types of white blood cells called lymphocytes or lymphoblasts. ALL is the most common type of cancer in children.

Possible risk factors for ALL include being male, being white, previous chemotherapy treatment, exposure to radiation, and for adults, being older than 70.

Symptoms of ALL include:

  • Weakness or feeling tired
  • Fever
  • Easy bruising or bleeding
  • Bleeding under the skin
  • Shortness of breath
  • Weight loss or loss of appetite
  • Pain in the bones or stomach
  • Pain or a feeling of fullness below the ribs
  • Painless lumps in the neck, underarm, stomach, or groin

Tests that examine the blood and bone marrow diagnose ALL. Treatments include chemotherapy, radiation therapy, stem cell transplants, and targeted therapy. Targeted therapy uses substances that attack cancer cells without harming normal cells. Once the leukemia is in remission, you need additional treatment to make sure that it does not come back.

NIH: National Cancer Institute


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Chronic Lymphocytic Leukemia

Leukemia is cancer of the white blood cells. White blood cells help your body fight infection. Your blood cells form in your bone marrow. In leukemia, the bone marrow produces abnormal white blood cells. These cells crowd out the healthy blood cells, making it hard for blood to do its work. In chronic lymphocytic leukemia (CLL), there are too many lymphocytes, a type of white blood cell.

CLL is the second most common type of leukemia in adults. It often occurs during or after middle age, and is rare in children.

Usually CLL does not cause any symptoms. If you have symptoms, they may include

  • Painless swelling of the lymph nodes in the neck, underarm, stomach, or groin
  • Fatigue
  • Pain or a feeling of fullness below the ribs
  • Fever and infection
  • Weight loss

Tests that examine the blood, bone marrow, and lymph nodes diagnose CLL. Your doctor may choose to just monitor you until symptoms appear or change. Treatments include radiation therapy, chemotherapy, surgery to remove the spleen, and targeted therapy. Targeted therapy uses substances that attack cancer cells or block the growth and spread of cancer cells.

NIH: National Cancer Institute


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