90540 includes 90465 and 90205, and 90240 (utilizing an electrophoretic or chromatographic separation technique for the detection and quantification of normal and variant hemoglobins including Hemoglobin A2 and Hemoglobin F.
In selected cases, 90240 may be billed in addition to 90540, where further electrophoreses (e.g.: citrate agar and/or isoelectric focusing) are required as diagnostic and/or confirmatory tests.
Not payable with 90220 (Hemoglobin A2) or 90175 (Fetal Hemoglobin).
Please reference the billing pre-amble for these relevant interpretations of this billing code:See Pre-Amble Notes