O35.13X4 – Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 4

ICD-10-CM 2027 diagnosis code · Maternal care related to the fetus and amniotic cavity and possible delivery problems

Billable code

ICD-10-CM code O35.13X4

Code: O35.13X4 (claims format: O3513X4)
Description: Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 4
Short description: Mat care chromosomal abnlt in fetus, Trisomy 21, fetus 4
Billable: Yes – valid for HIPAA-covered transactions
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 › O35.1 › O35.13

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

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 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.

O35.13 – Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21

Applicable to:

Maternal care for (suspected) chromosomal abnormality in fetus, Down syndrome

Related codes in O35.13

Frequently asked questions

What is ICD-10 code O35.13X4?

O35.13X4 is the ICD-10-CM code for maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 21, fetus 4, in the block O30-O48 (Maternal care related to the fetus and amniotic cavity and possible delivery problems).

Is O35.13X4 a billable code?

Yes. O35.13X4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does O35.13X4 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.