Other disturbances of straight-chain amino-acid metabolism

This code represents a group of rare inherited metabolic disorders affecting the breakdown and utilization of straight-chain amino acids, excluding those specifically classified elsewhere. These conditions result from enzyme deficiencies that lead to the accumulation of toxic metabolites, potentially causing neurological, developmental, and systemic issues.

Use this code for documented diagnoses of metabolic disorders involving straight-chain amino acids that do not have a more specific ICD-9-CM code. This includes conditions like propionic acidemia, methylmalonic acidemia, and isovaleric acidemia, when the specific type is not otherwise classifiable. Documentation should clearly state the diagnosis of a straight-chain amino acid metabolism disorder.

• Ensure the documentation specifies a straight-chain amino acid metabolism disorder; differentiate from branched-chain amino acid disorders.
• Avoid using this code if a more specific ICD-9-CM code exists for the documented condition (e.g., specific enzyme deficiency).
• Review physician notes for laboratory findings (e.g., elevated organic acids) that support the diagnosis of an amino acid metabolism disturbance.