O35 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Maternal care for known or suspected fetal abnormality and damage.
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The listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Any associated maternal condition
Encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
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.
0: not applicable or unspecified
1: fetus 1
2: fetus 2
3: fetus 3
4: fetus 4
5: fetus 5
9: other fetus
Maternal care for (suspected) central nervous system malformation in fetus
Maternal care for (suspected) chromosomal abnormality in fetus
Maternal care for other (suspected) fetal abnormality and damage, fetal facial anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunk
Maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomalies
Maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomalies
Maternal care for (suspected) hereditary disease in fetus
Maternal care for (suspected) damage to fetus from viral disease in mother
Maternal care for (suspected) damage to fetus from alcohol
Maternal care for (suspected) damage to fetus by drugs
Maternal care for (suspected) damage to fetus by radiation
Maternal care for (suspected) damage to fetus by other medical procedures
Maternal care for other (suspected) fetal abnormality and damage
Maternal care for (suspected) fetal abnormality and damage, unspecified
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