O24.311 Unspecified pre-existing diabetes mellitus in pregnancy, first trimester

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Unspecified pre-existing diabetes mellitus in pregnancy, first trimester is O24.311 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
O20-O29: Other maternal disorders predominantly related to pregnancy (O20-O29)
Category O24
57 codes (42 billable)
FY2026 Status
Stable since FY2024

U.S. Hospital Utilization

  • An estimated 95 U.S. inpatient stays in 2023 included O24.311 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

Related Codes

Parent Code

O24 Diabetes mellitus in pregnancy, childbirth, and the puerperium

Related Codes in O24

O24 Diabetes mellitus in pregnancy, childbirth, and the puerperium O24.0 Pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium O24.01 Pre-existing type 1 diabetes mellitus, in pregnancy O24.011 Pre-existing type 1 diabetes mellitus, in pregnancy, first trimester O24.012 Pre-existing type 1 diabetes mellitus, in pregnancy, second trimester O24.013 Pre-existing type 1 diabetes mellitus, in pregnancy, third trimester O24.019 Pre-existing type 1 diabetes mellitus, in pregnancy, unspecified trimester O24.02 Pre-existing type 1 diabetes mellitus, in childbirth O24.03 Pre-existing type 1 diabetes mellitus, in the puerperium O24.1 Pre-existing type 2 diabetes mellitus, in pregnancy, childbirth and the puerperium O24.11 Pre-existing type 2 diabetes mellitus, in pregnancy O24.111 Pre-existing type 2 diabetes mellitus, in pregnancy, first trimester O24.112 Pre-existing type 2 diabetes mellitus, in pregnancy, second trimester O24.113 Pre-existing type 2 diabetes mellitus, in pregnancy, third trimester O24.119 Pre-existing type 2 diabetes mellitus, in pregnancy, unspecified trimester O24.12 Pre-existing type 2 diabetes mellitus, in childbirth O24.13 Pre-existing type 2 diabetes mellitus, in the puerperium O24.3 Unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium O24.31 Unspecified pre-existing diabetes mellitus in pregnancy O24.312 Unspecified pre-existing diabetes mellitus in pregnancy, second trimester
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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