HCPCS 86420 — Pretreatment of serum for use in RBC antibody identification; by differential red cell absorption using patient RBC's or RBC's o (7 hospitals, — samples)
HCPCS 86421 — Radioallergosorbent test, in vitro testing for allergen-specific IgE; up to 5 tests (7 hospitals, — samples)
HCPCS 86422 — Radioallergosorbent test, in vitro testing for allergen-specific IgE; 6 or more tests (7 hospitals, — samples)