D89.89
BillableOther specified disorders involving the immune mechanism, not elsewhere classified
D89.89 is the ICD-10-CM code for Other specified disorders involving the immune mechanism, not elsewhere classified. It is a billable, specific code valid for reimbursement.
D50-D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
What this means — in plain language
MedlinePlus · NIHWhat is the immune system? Your immune system is a complex network of cells, tissues, and organs. Together they help the body fight infections and other diseases. When germs such as bacteria or viruses invade your body, they attack and multiply. This is called an infection. The infection causes the disease that makes you sick. Your immune system protects you from the disease by fighting off the germs. What are the…
Read more about Immune System and Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
- •human immunodeficiency virus disease (B20)
Frequently asked questions
- What is ICD-10 code D89.89?
- D89.89 is the ICD-10-CM code for "Other specified disorders involving the immune mechanism, not elsewhere classified". It falls under D50-D89 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.
- Is D89.89 a billable code?
- Yes — D89.89 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from D89.89?
- Excludes1 (not coded here): human immunodeficiency virus disease (B20).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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