O35.0 ICD-10-CM Code: Maternal care for (suspected) central nervous system malformation in fetus
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for O35.0 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 generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-) Compare O35.0 vs 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-) Compare O35.0 vs O35.1 →
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated maternal condition
Change history
No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.
Verify Before Coding
- Not billable as written — a more specific code is required: O35.00X0, O35.00X1, O35.00X2, O35.00X3, O35.00X4.
- Requires a 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." Options: O35.00X0, O35.00X1, O35.00X2, O35.00X3, O35.00X4, O35.00X5
From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.
Contextual Map
Every relationship of O35.0 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Hierarchy
- O00-O9A — Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A) (O00-O9A) [Hierarchy]
- O30-O48 — Maternal care related to the fetus and amniotic cavity and possible delivery problems [Hierarchy]
- O35 — Clinical Diagnosis [Hierarchy]
Excludes2
- O35.1 — Maternal care for (suspected) chromosomal abnormality in fetus [Excludes2]: “chromosomal abnormality in fetus (O35.1-)”
Referenced by Excludes1 notes
- Z03.7 — Encounter for suspected maternal and fetal conditions ruled out [Excludes1](via O35.-): “known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)”
Referenced by Excludes2 notes
- O98 — Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium [Excludes2](via O35.-): “when the reason for maternal care is that the disease is known or suspected to have affected the fetus (O35-O36)”
- O99 — Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium [Excludes2](via O35.-): “when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)”
Nearest codes (40)
- O35 — Maternal care for known or suspected fetal abnormality and damage [Sibling]
- O35.00 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified [Sibling]
- O35.00X0 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, not applicable or unspecified [Sibling]
- O35.00X1 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 1 [Sibling]
- O35.00X2 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 2 [Sibling]
- O35.00X3 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 3 [Sibling]
- O35.00X4 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 4 [Sibling]
- O35.00X5 — Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified, fetus 5 [Sibling]
- and 32 more
Referenced by Other Codes
Official ICD-10-CM tabular notes on other codes that name O35.0 or its code family.
1 Excludes1 notes: Z03.7 (via O35.-).
Frequently Asked Questions (FAQ) & Clinical Guidance
Can O35.0 be billed directly?
No. O35.0 (Maternal care for (suspected) central nervous system malformation in fetus) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does O35.0 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..
Nearest Codes in This Family
Official ICD-10-CM classifications closest to O35.0 in its code family, with their registry titles.
- O35 — Maternal care for known or suspected fetal abnormality and damage
- 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