ICD10
ICD-10 Code O24.11: Pre-existing type 2 diabetes mellitus, in pregnancy
Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).
đź“‹Clinical overview
This ICD-10 code is commonly used when documentation describes diabetes complicating pregnancy, childbirth, or the puerperium. The most accurate code depends on whether the diabetes is pre-existing or gestational, the trimester or delivery timing, and whether treatment-control detail is documented.
When is it used?
- May be used when a clinician documents pre-existing type 2 diabetes mellitus, in pregnancy in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
đź©şClinical context
When commonly used
- Obstetric, maternal-fetal medicine, inpatient, and prenatal documentation where diabetes affects pregnancy management, delivery planning, or postpartum follow-up.
- Coding, utilization-review, and continuity-of-care workflows where trimester, delivery timing, and diabetes type change the final maternal diagnosis detail.
Common workup
- Common related testing on this page includes Oral glucose tolerance test, Hemoglobin A1c, Fasting blood glucose.
- Related procedures or service context already linked on this page include Obstetric ultrasound, Fetal nonstress testing, Medical nutrition therapy.
Common management context
- Maternal-diabetes follow-up often includes glucose monitoring context, obstetric surveillance, medication review, fetal-growth monitoring, and delivery-planning discussions.
- Documentation usually becomes more specific when the chart identifies pre-existing type 1 or type 2 diabetes, gestational diabetes, trimester, delivery timing, or control method such as diet or insulin.
- Specialist context already linked on this page includes Obstetrician, Gynecologist, Endocrinologist, Maternal-Fetal Medicine Specialist.
🔍Key distinctions
Important notes
- Maternal-diabetes ICD-10 coding is highly context-sensitive, and specificity usually depends on whether the diabetes is pre-existing or gestational plus whether the encounter is during pregnancy, childbirth, or the puerperium.
- Trimester detail and treatment-control detail often matter for gestational-diabetes coding, while pre-existing diabetes in pregnancy is coded separately from gestational diabetes.
- This title reflects pregnancy complicated by pre-existing type 2 diabetes, which is coded separately from gestational diabetes and usually depends on trimester or delivery context.
Related codes to consider
O24.111Pre-existing type 2 diabetes mellitus, in pregnancy, first trimester
Related maternal-diabetes ICD-10 code; documentation often becomes more specific when the chart identifies pre-existing versus gestational diabetes, trimester, delivery timing, or control detail.
O24.112Pre-existing type 2 diabetes mellitus, in pregnancy, second trimester
Related maternal-diabetes ICD-10 code; documentation often becomes more specific when the chart identifies pre-existing versus gestational diabetes, trimester, delivery timing, or control detail.
O24.113Pre-existing type 2 diabetes mellitus, in pregnancy, third trimester
Related maternal-diabetes ICD-10 code; documentation often becomes more specific when the chart identifies pre-existing versus gestational diabetes, trimester, delivery timing, or control detail.
O24.119Pre-existing type 2 diabetes mellitus, in pregnancy, unspecified trimester
Related maternal-diabetes ICD-10 code; documentation often becomes more specific when the chart identifies pre-existing versus gestational diabetes, trimester, delivery timing, or control detail.
Code hierarchy
chapter
15Pregnancy, childbirth and the puerperium (O00-O9A)
block
O20-O29Other maternal disorders predominantly related to pregnancy
category
O24Diabetes mellitus in pregnancy, childbirth, and the puerperium
category
O24.1Pre-existing type 2 diabetes mellitus, in pregnancy, childbirth and the puerperium
currentO24.1
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
ObstetricianGynecologistEndocrinologistMaternal-Fetal Medicine Specialist
Related tests
Oral glucose tolerance test
Often considered when assessing glucose intolerance or diabetes in pregnancy.
Hemoglobin A1c
May be reviewed alongside other pregnancy-related diabetes assessments.
Fasting blood glucose
May help review fasting glucose patterns in pregnancy-related diabetes care.
Related procedures
Obstetric ultrasound
May appear in pregnancy-related care pathways alongside diabetes monitoring.
Fetal nonstress testing
May be used in selected higher-risk pregnancy follow-up pathways.
Medical nutrition therapy
May appear in pregnancy-related diabetes management and education pathways.
Related codes
O24.111Pre-existing type 2 diabetes mellitus, in pregnancy, first trimestercodeO24.112Pre-existing type 2 diabetes mellitus, in pregnancy, second trimestercodeO24.113Pre-existing type 2 diabetes mellitus, in pregnancy, third trimestercodeO24.119Pre-existing type 2 diabetes mellitus, in pregnancy, unspecified trimestercode
Sibling codes
Coding guidelines
Common synonyms
Pre-existing type 2 diabetes mellitus, in pregnancy
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.