CPT^® Code Modifiers

-/+ Deleted, Replaced, Expanded Codes

section notes

section notes

section notes

4A				HLA-A*
4B				HLA-B*
4C				HLA-C*
4E				4E HLA-DRB all
4F				HLA-DQB1*
4G				HLA-DPB1*
4H				Kell
4I				Fingerprint for engraftment (post allogeneic progenitor cell transplant)
4J				Fingerprint for donor allelotype (allogeneic transplant)
4K				Fingerprint for recipient allelotype (allogeneic transplant)
4L				Fingerprint for leukocyte chimerism (allogeneic solid organ transplant)
4M				Fingerprint for maternal versus fetal origin
4N				Microsatellite instability
4O				Microsatellite loss (loss of heterozygosity)
4P				HLA-DRB1*
4Q				HLA-DRB3*
4R				HLA-DRB4*
4S				HLA-DRB5*
4T				HLA-DQA1*
4U				HLA-DPA1*
4Z				Histocompatiblity/typing, not otherwise specified

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