E70.8Other disorders of aromatic amino-acid metabolism

E70.8 is the ICD-10-CM diagnosis code for other disorders of aromatic amino-acid metabolism. It belongs to category E70 (disorders of aromatic amino-acid metabolism), block E70-E88 (metabolic disorders) and chapter 4 (endocrine, nutritional and metabolic diseases). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within E70, choose E70.8 (Other disorders of aromatic amino-acid metabolism) only when documentation doesn't support a more specific option: classical phenylketonuria (E70.0), other hyperphenylalaninemias (E70.1), disorders of tyrosine metabolism (E70.2), albinism (E70.3), disorders of histidine metabolism (E70.4), disorders of tryptophan metabolism (E70.5) and disorder of aromatic amino-acid metabolism, unspecified (E70.9).

To report this condition, pick the subcode that matches the documentation: E70.81 (deficiency) and E70.89 (metabolism).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2021 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 270.2 (other disturbances of aromatic amino-acid metabolism).