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

ICD-10-CM Diagnosis Code (2025)

Official Description for O35

Maternal care for known or suspected fetal abnormality and damage

Coding Notes & Guidelines for O35

Includes Notes

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

Excludes1: Not Coded Here

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

Excludes2: Not Included Here

chromosomal abnormality in fetus (O35.1-)

Excludes2: Not Included Here
  • maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies (O35.H)
  • maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies (O35.G)
Excludes2: Not Included Here

chromosomal abnormality in fetus (O35.1-)

Inclusion Terms

Maternal care for fetal hydrocephalus

Inclusion Terms
  • Maternal care for damage to fetus from maternal cytomegalovirus infection
  • Maternal care for damage to fetus from maternal rubella
Inclusion Terms

Maternal care for damage to fetus from drug addiction

Inclusion Terms
  • Maternal care for damage to fetus by amniocentesis
  • Maternal care for damage to fetus by biopsy procedures
  • Maternal care for damage to fetus by hematological investigation
  • Maternal care for damage to fetus by intrauterine contraceptive device
  • Maternal care for damage to fetus by intrauterine surgery
Inclusion Terms
  • Maternal care for damage to fetus from maternal listeriosis
  • Maternal care for damage to fetus from maternal toxoplasmosis
Code Also

any associated maternal condition

7th Character Guidance

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.

7th Character Definitions
  • 0: not applicable or unspecified
  • 1: fetus 1
  • 2: fetus 2
  • 3: fetus 3
  • 4: fetus 4
  • 5: fetus 5
  • 9: other fetus

Child Codes (More Specific Codes for O35):

O35.0 - Maternal care for (suspected) central nervous system malformation in fetus O35.00 - Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified O35.01 - Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum O35.02 - Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly O35.03 - Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts O35.04 - Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele O35.05 - Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly O35.06 - Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly O35.07 - Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephaly O35.08 - Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifida O35.09 - Maternal care for (suspected) other central nervous system malformation or damage in fetus O35.1 - Maternal care for (suspected) chromosomal abnormality in fetus O35.10 - Maternal care for (suspected) chromosomal abnormality in fetus, unspecified O35.11 - Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13 O35.12 - Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 18 O35.13 - Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21 O35.14 - Maternal care for (suspected) chromosomal abnormality in fetus, Turner Syndrome O35.15 - Maternal care for (suspected) chromosomal abnormality in fetus, sex chromosome abnormality O35.19 - Maternal care for (suspected) chromosomal abnormality in fetus, other chromosomal abnormality O35.2 - Maternal care for (suspected) hereditary disease in fetus O35.3 - Maternal care for (suspected) damage to fetus from viral disease in mother O35.4 - Maternal care for (suspected) damage to fetus from alcohol O35.5 - Maternal care for (suspected) damage to fetus by drugs O35.6 - Maternal care for (suspected) damage to fetus by radiation O35.7 - Maternal care for (suspected) damage to fetus by other medical procedures O35.8 - Maternal care for other (suspected) fetal abnormality and damage O35.9 - Maternal care for (suspected) fetal abnormality and damage, unspecified O35.A - Maternal care for other (suspected) fetal abnormality and damage, fetal facial anomalies O35.B - Maternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomalies O35.C - Maternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomalies O35.D - Maternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomalies O35.E - Maternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomalies O35.F - Maternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunk O35.G - Maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies O35.H - Maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies

About ICD-10-CM Code O35 (Maternal care for known or suspected fetal abnormality and damage)

ICD-10-CM code O35 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM O35 became effective on October 1, 2024.

This page provides detailed information about O35 - Maternal care for known or suspected fetal abnormality and damage. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Maternal care for known or suspected fetal abnormality and damage.