O35.03X1 is the authoritative medical code for Maternal care for suspected central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 1. This classification is used in medical billing and clinical recording to specify the clinical criteria for maternal care for suspected central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 1 (ICD-10-CM O35.03X1), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Maternal care for suspected central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 1 is a billable ICD-10-CM diagnosis code O35.031. 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-. Excludes2 (not included here): chromosomal abnormality in fetus O35.1-. Code also: 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..
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for O35.03X1 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- 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
Conditions that can never be reported with this code; the two are mutually exclusive.
- encounter for suspected maternal and fetal conditions ruled out Z03.7-
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- chromosomal abnormality in fetus O35.1-
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated maternal condition
Frequently Asked Questions (FAQ) & Clinical Guidance
Does O35.03X1 require a 7th character?
Yes. 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..
What can't be coded together with O35.03X1?
Per Excludes1 instructions, O35.03X1 must not be reported with: encounter for suspected maternal and fetal conditions ruled out (Z03.7-).
Can O35.03X1 be reported alongside related conditions?
Per Excludes2 instructions, O35.03X1 and the following may both be reported when both are present: chromosomal abnormality in fetus (O35.1-).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as O35.03X1, with their registry titles.
- O35 — Maternal care for known or suspected fetal abnormality and damage
- 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
- O35.00X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, not applicable or unspecified
- O35.00X1 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 1
- O35.00X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 2
- O35.00X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 3
- O35.00X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 4
- O35.00X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 5
- O35.00X9 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, other fetus
- O35.01 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum
- O35.01X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, not applicable or unspecified
- O35.01X1 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, fetus 1
- O35.01X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, fetus 2
- O35.01X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, fetus 3
- O35.01X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, fetus 4
- O35.01X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, fetus 5
- O35.01X9 — Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum, other fetus
- O35.02 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly
- O35.02X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, not applicable or unspecified
- O35.02X1 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 1
- O35.02X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 2
- O35.02X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 3
- O35.02X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 4
- O35.02X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, fetus 5
- O35.02X9 — Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly, other fetus
- O35.03 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts
- O35.03X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, not applicable or unspecified
- O35.03X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 2
- O35.03X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 3
- O35.03X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 4
- O35.03X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, fetus 5
- O35.03X9 — Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts, other fetus
- O35.04 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele
- O35.04X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, not applicable or unspecified
- O35.04X1 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 1
- O35.04X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 2
- O35.04X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 3
- O35.04X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 4
- O35.04X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele, fetus 5
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: