When is ICD-10 code O35 used?

Doctors, hospitals, and insurers may use ICD-10 code O35 when recording maternal care for known or suspected fetal abnormality and damage in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code O35 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code O35: Maternal care for known or suspected fetal abnormality and damage

Name: ICD-10 Code O35: Maternal care for known or suspected fetal abnormality and damage
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:27:59.932Z

O35 is an ICD-10 diagnosis entry used to group records related to Maternal care for known or suspected fetal abnormality and damage. 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. 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).

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).

When is it used?

May be used when a clinician documents maternal care for known or suspected fetal abnormality and damage 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.

Code hierarchy

chapter

15Pregnancy, childbirth and the puerperium (O00-O9A)

block

O30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems

currentO30-O48

Official coding notes

Includes

the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy

Excludes1 (do not code together)

encounter for suspected maternal and fetal conditions ruled out (Z03.7-)

Code also

any associated maternal condition

7th character notes

One of the following 7th characters is to be assigned to each code under category O35. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O35 that has a 7th character of 1 through 9.
not applicable or unspecified
fetus 1
fetus 2
fetus 3
fetus 4
fetus 5
other fetus

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

ObstetricianGynecologist

Sibling codes

O30Multiple gestation O31Complications specific to multiple gestation O32Maternal care for malpresentation of fetus O33Maternal care for disproportion O34Maternal care for abnormality of pelvic organs O36Maternal care for other fetal problems O40Polyhydramnios O41Other disorders of amniotic fluid and membranes O42Premature rupture of membranes O43Placental disorders O44Placenta previa O45Premature separation of placenta [abruptio placentae]O46Antepartum hemorrhage, not elsewhere classified O47False labor O48Late pregnancy

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

O35

Replacement codes

O35.2 — Maternal care for (suspected) hereditary disease in fetusO35.3 — Maternal care for (suspected) damage to fetus from viral disease in motherO35.4 — Maternal care for (suspected) damage to fetus from alcoholO35.5 — Maternal care for (suspected) damage to fetus by drugsO35.6 — Maternal care for (suspected) damage to fetus by radiationO35.7 — Maternal care for (suspected) damage to fetus by other medical proceduresO35.8 — Maternal care for other (suspected) fetal abnormality and damageO35.9 — Maternal care for (suspected) fetal abnormality and damage, unspecifiedO35.A — Maternal care for other (suspected) fetal abnormality and damage, fetal facial anomaliesO35.B — Maternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomaliesO35.C — Maternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomaliesO35.D — Maternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomaliesO35.E — Maternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomaliesO35.F — Maternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunkO35.G — Maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomaliesO35.H — Maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies

Common synonyms

Maternal care for known or suspected fetal abnormality and damage

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.