CPT® Code 83921

An organic acid analysis, as described by CPT® Code 83921, involves the quantitative measurement of a single organic acid in biological specimens such as blood or urine. Organic acids are metabolic by-products that are typically broken down into carbon dioxide and water during normal metabolic processes. However, in individuals with organic acid disorders, certain proteins fail to undergo proper breakdown, leading to various health complications ranging from nutrient deficiencies to severe metabolic crises. These disorders are inherited in an autosomal recessive manner, affecting both males and females equally. The symptoms associated with organic acid disorders can vary significantly based on the specific type of disorder present, and treatment approaches are tailored accordingly. Common organic acids that may be analyzed include 2,4 dichlorophenoxyacetic acid, formic acid, glutaric acid (which is indicative of glutaric acidemia type 1 due to the inability to metabolize lysine and tryptophan), hippuric acid, homogentisic acid, methylhippuric acid, methylmalonic acid (which can indicate a vitamin B12 deficiency), orotic acid, and trichloroacetic acid. The testing methodology utilized may differ based on the specimen type and the specific organic acid being evaluated. It is important to note that if blood is the specimen used for testing, a separate venipuncture procedure must be reported. This code specifically pertains to the quantitative analysis of a single organic acid, distinguishing it from other related codes that either measure multiple organic acids or provide qualitative assessments of their presence in the specimen.