O24.31
⚠ Non-billable (Header)Unspecified pre-existing diabetes mellitus in pregnancy
Pregnancy, childbirth and the puerperium (O00-O9A)
⚠️ This is a category header code — not billable. Use a more specific child code below.
📋 Code Instructions
from O24.3- • code (for):
- • from category E11 to further identify any manifestation
- • injectable non-insulin antidiabetic drugs (Z79.85)
- • long-term (current) use of insulin (Z79.4)
✅ No additional coding notes for O24.31
Child Codes (4)
O24.311Unspecified pre-existing diabetes mellitus in pregnancy, first trimesterO24.312Unspecified pre-existing diabetes mellitus in pregnancy, second trimesterO24.313Unspecified pre-existing diabetes mellitus in pregnancy, third trimesterO24.319Unspecified pre-existing diabetes mellitus in pregnancy, unspecified trimester
🧪 Validate Combinations
Add O24.31 to the Excludes Checker to validate against your full code list.
Open in Checker →Code Information
CodeO24.31
BillableNo — Header code
ParentO24.3
CategoryPregnancy, childbirth and the puerperium (O00-O9A)
Excludes10 rule(s)
Excludes20 note(s)
Child codes4
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)