ICD10BillableValid for clinical use
ICD-10 Code O99.310: Alcohol use complicating pregnancy, unspecified trimester
Reviewed by HealthAssure Clinical TeamUpdated 21 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 alcohol use complicating pregnancy, childbirth, or the puerperium. The most accurate code depends on maternal timing and whether the chart more clearly describes the substance-use context or associated maternal and fetal risk.
When is it used?
- May be used when a clinician documents alcohol use complicating pregnancy, unspecified trimester 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, prenatal, inpatient, addiction-medicine, and maternal-fetal medicine documentation where maternal alcohol use materially affects pregnancy monitoring, delivery planning, or postpartum recovery.
- Coding and utilization-review workflows where the record clearly ties alcohol-use context to pregnancy, childbirth, or the puerperium and timing changes the final complication code.
Common workup
- Related procedures or service context already linked on this page include Obstetric ultrasound, Fetal nonstress testing.
Common management context
- Maternal alcohol-use follow-up often includes substance-use history review, obstetric monitoring, counseling or behavioral-health coordination, and planning for maternal and neonatal follow-up.
- Documentation usually becomes more specific when the chart identifies trimester detail, delivery timing, puerperium context, dependence or withdrawal context, or other associated maternal conditions elsewhere in the record.
- Specialist context already linked on this page includes Obstetrician, Gynecologist.
🔍Key distinctions
Important notes
- This ICD-10 family captures maternal alcohol use as a pregnancy-related complication, while separate diagnosis coding may still carry the broader substance-use disorder detail documented elsewhere in the chart.
- Pregnancy, childbirth, puerperium, and trimester timing matter, and clearer chart language about the alcohol-use pattern or associated risk context can add specificity beyond this broad obstetric complication family.
- This title reflects maternal alcohol use complicating pregnancy, which is coded separately from alcohol-use complications during childbirth or the puerperium.
- This title reflects unspecified trimester detail; if the chart clearly states the trimester, a more specific maternal alcohol-use code may be used.
Related codes to consider
O99.311Alcohol use complicating pregnancy, first trimester
Related maternal alcohol-use ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, puerperium context, or clearer substance-use and maternal-risk detail.
O99.312Alcohol use complicating pregnancy, second trimester
Related maternal alcohol-use ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, puerperium context, or clearer substance-use and maternal-risk detail.
O99.313Alcohol use complicating pregnancy, third trimester
Related maternal alcohol-use ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, puerperium context, or clearer substance-use and maternal-risk detail.
O99.314Alcohol use complicating childbirth
Related maternal alcohol-use ICD-10 code; documentation often becomes more specific when the chart identifies trimester, delivery timing, puerperium context, or clearer substance-use and maternal-risk detail.
Code hierarchy
chapter
15Pregnancy, childbirth and the puerperium (O00-O9A)
block
O94-O9AOther obstetric conditions, not elsewhere classified
category
O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
category
O99.3Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium
category
O99.31Alcohol use complicating pregnancy, childbirth, and the puerperium
currentO99.31
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
ObstetricianGynecologist
Related procedures
Obstetric ultrasound
May appear in pregnancy follow-up pathways when maternal diseases complicate pregnancy and fetal well-being is monitored.
Fetal nonstress testing
May be used in selected higher-risk pregnancy monitoring pathways.
Related codes
Sibling codes
O99.311Alcohol use complicating pregnancy, first trimesterbillableO99.312Alcohol use complicating pregnancy, second trimesterbillableO99.313Alcohol use complicating pregnancy, third trimesterbillableO99.314Alcohol use complicating childbirthbillableO99.315Alcohol use complicating the puerperiumbillable
Coding guidelines
Common synonyms
Alcohol use complicating pregnancy, unspecified trimesterAlcohol use complicating 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.