ICD-10 Code D84.89 – Other immunodeficiencies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D84.89 – Other immunodeficiencies
What it is
D84.89 is used for immunodeficiency conditions that do not fit a more specific ICD-10 category. It signals impaired immune function, but the exact cause or subtype is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may describe recurrent, unusual, or severe infections, poor immune response, or an identified immune defect that is not named elsewhere.
When to use this code
Use this code when the provider documents an immunodeficiency and no more specific ICD-10 code applies. It may also fit cases labeled as other or unspecified immune deficiency after review of the chart. Check documentation for the exact diagnosis and any underlying condition.
Do not use for
Do not use D84.89 when a more specific immunodeficiency code is documented, such as a primary immune disorder or drug-induced immunodeficiency. Avoid it if the record only notes infection without confirmed immune deficiency.
Coding tip
Verify the provider’s exact wording and code the most specific immunodeficiency diagnosis supported by the note.