ICD10BillableValid for clinical use
ICD-10 Code O98.312: Other infections with a predominantly sexual mode of transmission complicating pregnancy, second 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 a maternal infection with a predominantly sexual mode of transmission complicating pregnancy, childbirth, or the puerperium. The most accurate code depends on maternal timing and whether trimester, delivery, or postpartum context is clearly documented.
When is it used?
- May be used when a clinician documents other infections with a predominantly sexual mode of transmission complicating pregnancy, second 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, maternal-fetal medicine, infectious-disease, inpatient, and follow-up documentation where a sexually transmitted infection materially affects pregnancy management, delivery planning, or postpartum recovery.
- Coding and utilization-review workflows where the chart clearly ties the maternal infection 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 STI-complication follow-up often includes infectious-disease evaluation context, maternal symptom review, treatment and partner-management counseling context, and coordination of obstetric follow-up during pregnancy or postpartum recovery.
- Documentation usually becomes more specific when the chart identifies trimester timing, delivery timing, puerperium context, and the underlying infection named elsewhere in the record.
- Specialist context already linked on this page includes Obstetrician, Gynecologist, Infectious Disease Specialist.
🔍Key distinctions
Important notes
- This ICD-10 family captures maternal infections with a predominantly sexual mode of transmission as pregnancy-related complications, and the distinction between pregnancy, childbirth, and puerperium timing is part of what makes these codes different from one another.
- Trimester detail matters for pregnancy-coded cases, while delivery and postpartum timing matter for childbirth and puerperium-coded cases.
- This title reflects a maternal infection with a predominantly sexual mode of transmission complicating pregnancy, which is coded separately from childbirth or puerperium timing because maternal timing changes code specificity.
- Trimester detail is part of the maternal STI-complication code choice, so documentation that clearly states first, second, or third trimester affects specificity.
Related codes to consider
O98.311Other infections with a predominantly sexual mode of transmission complicating pregnancy, first trimester
Related maternal STI-complication ICD-10 code; documentation often becomes more specific when the chart identifies trimester detail or clearer pregnancy, childbirth, puerperium timing, or the underlying infection.
O98.313Other infections with a predominantly sexual mode of transmission complicating pregnancy, third trimester
Related maternal STI-complication ICD-10 code; documentation often becomes more specific when the chart identifies trimester detail or clearer pregnancy, childbirth, puerperium timing, or the underlying infection.
O98.319Other infections with a predominantly sexual mode of transmission complicating pregnancy, unspecified trimester
Related maternal STI-complication ICD-10 code; documentation often becomes more specific when the chart identifies trimester detail or clearer pregnancy, childbirth, puerperium timing, or the underlying infection.
Code hierarchy
chapter
15Pregnancy, childbirth and the puerperium (O00-O9A)
block
O94-O9AOther obstetric conditions, not elsewhere classified
category
O98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
category
O98.3Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium
category
O98.31Other infections with a predominantly sexual mode of transmission complicating pregnancy
currentO98.31
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
ObstetricianGynecologistInfectious Disease Specialist
Related procedures
Obstetric ultrasound
May appear in pregnancy follow-up pathways when maternal infection complicates pregnancy and fetal well-being is monitored.
Fetal nonstress testing
May be used in selected higher-risk pregnancy monitoring pathways.
Related codes
O98.311Other infections with a predominantly sexual mode of transmission complicating pregnancy, first trimestercodeO98.313Other infections with a predominantly sexual mode of transmission complicating pregnancy, third trimestercodeO98.319Other infections with a predominantly sexual mode of transmission complicating pregnancy, unspecified trimestercode
Sibling codes
O98.311Other infections with a predominantly sexual mode of transmission complicating pregnancy, first trimesterbillableO98.313Other infections with a predominantly sexual mode of transmission complicating pregnancy, third trimesterbillableO98.319Other infections with a predominantly sexual mode of transmission complicating pregnancy, unspecified trimesterbillable
Coding guidelines
Common synonyms
Other infections with a predominantly sexual mode of transmission complicating pregnancy, second trimester
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.