O35
ICD-10Non-billable categoryMaternal care for known or suspected fetal abnlt and damage
Official ICD-10-CM descriptor (FY2026)
Maternal care for known or suspected fetal abnormality and damage
O35 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
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
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code also
Two codes may be needed; sequencing depends on the reason for the encounter.
- any associated maternal condition
7th character
- 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.
Permitted 7th characters
| 0 | not applicable or unspecified |
| 1 | fetus 1 |
| 2 | fetus 2 |
| 3 | fetus 3 |
| 4 | fetus 4 |
| 5 | fetus 5 |
| 9 | other fetus |
More specific codes under O35
- O35.0Maternal care for (suspected) cnsl malformation in fetuscategory
- O35.1Maternal care for chromosomal abnormality in fetuscategory
- O35.AMat care other fetal abnlt and damage, fetal facial anomalcategory
- O35.BMat care other fetal abnlt and damage, fetal cardiac anomalcategory
- O35.CMat care other fetal abnlt and damage, fetal pulm anomalcategory
- O35.DMat care other fetal abnlt and damage, fetal GI anomaliescategory
- O35.EMat care other fetal abnlt and damage, fetal GU anomaliescategory
- O35.FMat care other fetl abnlt and damag, fetl ms anomal of trunkcategory
- O35.GMat care other fetl abnlt and damag, fetl upper extrm anomalcategory
- O35.HMat care other fetal abnlt and damag, fetal low extrm anomalcategory
- O35.2Maternal care for (suspected) hereditary disease in fetuscategory
- O35.3Matern care for damage to fetus from viral disease in mothercategory
- O35.4Maternal care for (suspected) damage to fetus from alcoholcategory
- O35.5Maternal care for (suspected) damage to fetus by drugscategory
- O35.6Maternal care for (suspected) damage to fetus by radiationcategory
- O35.7Maternal care for damage to fetus by oth medical procedurescategory
- O35.8Maternal care for oth fetal abnormality and damagecategory
- O35.9Maternal care for fetal abnormality and damage, unspcategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.