In response to the 88342 per block vs per antibody;
Medicare has once again realigned with AMA guidelines. IHC is coded per antibody.
Medicare's exception is with the "cocktail stains."
A little history - In 2009, MCR policy deviated from AMA stating you could charge special stains and IHC per block if medically reasonable and necessary. In 2012, MCR realigned with AMA stating IHC is charged per antibody per specimen. In 2012, AMA guidelines updated Special stain descriptors - report one unit of special stain on each surgical pathology block, cytologic specimen, or hematologic smear.
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