Abnormal Total Natural Killer Cell Count C4021036
Natural killer cells are immune cells that help defend against viruses and abnormal cells. An abnormal count may affect your ability to fight infections. Doctors will investigate potential causes and recommend monitoring or treatment as needed.
Key facts at a glance
- ICD-10
- D89.9
- ICD-11
- 3A00.0
- Body system
- immunologic
- Severity
- mild
- Chronic
- true
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy