E70.4 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
E70.40
Disorders of histidine metabolism, unspecified
Billable
10
E70.41
Histidinemia
Billable
10
E70.49
Other disorders of histidine metabolism
Billable