D74 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
D74.0
Congenital methemoglobinemia
Billable
10
D74.8
Other methemoglobinemias
Billable
10
D74.9
Methemoglobinemia, unspecified
Billable