Blood Group I System C0020717
A blood group system based on the I antigen, which is present on nearly all adult red blood cells. Rare individuals lack the antigen and may develop related antibodies.
Key facts at a glance
- ICD-10
- D64.9
- ICD-11
- 3A00.0
- Body system
- hematologic
- 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