MCMCB Pro
O24.013

O24.013Pre-existing type 1 diabetes mellitus, in pregnancy, third trimester

Billable / specific codeICD-10-CM

O24.013 is a billable, specific ICD-10-CM code for pre-existing type 1 diabetes mellitus, in pregnancy, third trimester. It is valid for submission on a claim.

Risk adjustment

O24.013 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

O24.013 is named in 11 Medicare coverage policies 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A52464Glucose Monitor - Policy Article
  • A52996Billing and Coding: Routine Foot Care
  • A56686Billing and Coding: HbA1c
  • A57189Billing and Coding: Serum Magnesium

Related codes at this level

Codes that share O24.01. If O24.013 is not quite right, the correct code is usually one of these.

Questions about O24.013

Is O24.013 a billable ICD-10-CM code?
Yes. O24.013 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does O24.013 sit in the tabular list?
Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other maternal disorders predominantly related to pregnancy (O20-O29).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.