O35.0 – Maternal care for (suspected) central nervous system malformation in fetus
ICD-10-CM 2027 diagnosis code · Maternal care related to the fetus and amniotic cavity and possible delivery problems
ICD-10-CM code
O35.0
- Code
O35.0(claims format:O350)- Description
- Maternal care for (suspected) central nervous system malformation in fetus
- Short description
- Maternal care for (suspected) cnsl malformation in fetus
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 15. Pregnancy, childbirth and the puerperium (O00-O9A)
- Block
- O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems
- Parent codes
- O35
Billable codes under O35.0
O35.0 is a header code and cannot be used on claims. Choose the most specific code:
- O35.00 – Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecifiedHeader (more codes below)
- O35.01 – Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosumHeader (more codes below)
- O35.02 – Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephalyHeader (more codes below)
- O35.03 – Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cystsHeader (more codes below)
- O35.04 – Maternal care for (suspected) central nervous system malformation or damage in fetus, encephaloceleHeader (more codes below)
- O35.05 – Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephalyHeader (more codes below)
- O35.06 – Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephalyHeader (more codes below)
- O35.07 – Maternal care for (suspected) central nervous system malformation or damage in fetus, microcephalyHeader (more codes below)
- O35.08 – Maternal care for (suspected) central nervous system malformation or damage in fetus, spina bifidaHeader (more codes below)
- O35.09 – Maternal care for (suspected) other central nervous system malformation or damage in fetusHeader (more codes below)
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).
| Character | Meaning |
|---|---|
0 | not applicable or unspecified |
1 | fetus 1 |
2 | fetus 2 |
3 | fetus 3 |
4 | fetus 4 |
5 | fetus 5 |
9 | other fetus |
Notes for O35.0
Excludes2 (not included here):
- chromosomal abnormality in fetus (O35.1-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
O35 – Maternal care for known or suspected fetal abnormality and damage
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):
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code also:
- any associated maternal condition
7th character note:
- 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.
Related codes in O35
- O35.1 – Maternal care for (suspected) chromosomal abnormality in fetusHeader
- O35.A – Maternal care for other (suspected) fetal abnormality and damage, fetal facial anomaliesHeader
- O35.B – Maternal care for other (suspected) fetal abnormality and damage, fetal cardiac anomaliesHeader
- O35.C – Maternal care for other (suspected) fetal abnormality and damage, fetal pulmonary anomaliesHeader
- O35.D – Maternal care for other (suspected) fetal abnormality and damage, fetal gastrointestinal anomaliesHeader
- O35.E – Maternal care for other (suspected) fetal abnormality and damage, fetal genitourinary anomaliesHeader
- O35.F – Maternal care for other (suspected) fetal abnormality and damage, fetal musculoskeletal anomalies of trunkHeader
- O35.G – Maternal care for other (suspected) fetal abnormality and damage, fetal upper extremities anomaliesHeader
- O35.H – Maternal care for other (suspected) fetal abnormality and damage, fetal lower extremities anomaliesHeader
- O35.2 – Maternal care for (suspected) hereditary disease in fetusHeader
- O35.3 – Maternal care for (suspected) damage to fetus from viral disease in motherHeader
- O35.4 – Maternal care for (suspected) damage to fetus from alcoholHeader
- O35.5 – Maternal care for (suspected) damage to fetus by drugsHeader
- O35.6 – Maternal care for (suspected) damage to fetus by radiationHeader
- O35.7 – Maternal care for (suspected) damage to fetus by other medical proceduresHeader
- O35.8 – Maternal care for other (suspected) fetal abnormality and damageHeader
- O35.9 – Maternal care for (suspected) fetal abnormality and damage, unspecifiedHeader
Frequently asked questions
What is ICD-10 code O35.0?
O35.0 is the ICD-10-CM code for maternal care for (suspected) central nervous system malformation in fetus, in the block O30-O48 (Maternal care related to the fetus and amniotic cavity and possible delivery problems).
Is O35.0 a billable code?
No. O35.0 is a header code with more specific child codes; report one of the billable codes listed above.
What category does O35.0 belong to?
It belongs to category O35 – Maternal care for known or suspected fetal abnormality and damage.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.