ICD-10 Code for Hyperammonemia
The default ICD-10-CM 2027 code for hyperammonemia (congenital) is E72.20 – Disorder of urea cycle metabolism, unspecified. More specific codes depend on the details documented, as listed in the official index (1 codes, 1 billable).
- Main code
E72.20– Disorder of urea cycle metabolism, unspecified- Billable
- Yes
How to choose the right code
Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.
Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.