ICD10BillableValid for clinical use
ICD-10 Code O24.02: Pre-existing type 1 diabetes mellitus, in childbirth
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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 1 diabetes mellitus, in childbirth in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
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 1 diabetes, which is coded differently from gestational diabetes and typically depends on trimester or delivery context.
- Maternal-diabetes coding during childbirth is distinct from antepartum or postpartum coding and usually depends on the delivery encounter context.
Related codes to consider
O24.01Pre-existing type 1 diabetes mellitus, in pregnancy
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.
O24.03Pre-existing type 1 diabetes mellitus, in the puerperium
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
O24.0Pre-existing type 1 diabetes mellitus, in pregnancy, childbirth and the puerperium
currentO24.0
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
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
Sibling codes
Coverage-related procedures and services
CPT 0446Thigh
CREATION OF SUBCUTANEOUS POCKET WITH INSERTION OF IMPLANTABLE INTERSTITIAL GLUCOSE SENSOR, INCLUDING SYSTEM ACTIVATION AND PATIENT TRAINING
Source: CMS coverage guidance
CPT 0448Thigh
REMOVAL OF IMPLANTABLE INTERSTITIAL GLUCOSE SENSOR WITH CREATION OF SUBCUTANEOUS POCKET AT DIFFERENT ANATOMIC SITE AND INSERTION OF NEW IMPLANTABLE SENSOR, INCLUDING SYSTEM ACTIVATION
Source: CMS coverage guidance
CPT 0447Thigh
REMOVAL OF IMPLANTABLE INTERSTITIAL GLUCOSE SENSOR FROM SUBCUTANEOUS POCKET VIA INCISION
Source: CMS coverage guidance
CPT 11720high
DEBRIDEMENT OF NAIL(S) BY ANY METHOD(S); 1 TO 5
Source: CMS coverage guidance
CPT 11721high
DEBRIDEMENT OF NAIL(S) BY ANY METHOD(S); 6 OR MORE
Source: CMS coverage guidance
CPT 11056high
PARING OR CUTTING OF BENIGN HYPERKERATOTIC LESION (EG, CORN OR CALLUS); 2 TO 4 LESIONS
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Pre-existing type 1 diabetes mellitus, in childbirth
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.