Alphabetic Index FY2027

O35.10

Maternal care for (suspected) chromosomal abnormality in fetus, unspecified

FY2027Chapter 15: Pregnancy, childbirth and the puerperium/O30–O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

O35.10 is a non-billable ICD-10-CM code header for maternal care for (suspected) chromosomal abnormality in fetus, unspecified. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. A 7th character is required to complete the code. Its coding notes include a Use additional code instruction, a Code also instruction, 2 Excludes1 entries and 4 Excludes2 entries.

7th character

Category O35 requires a 7th character. O35.10 has only 5 characters, so a placeholder X fills the 6th position.

Assembled code O35.10X0 Open code

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

The trimester character comes from the provider's documentation for the current encounter. The unspecified trimester code should rarely be used.

Guidelines I.C.15.a.3; I.C.15.a.5Pregnancy: the trimester characterRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

Inherited from O35 Maternal care for known or suspected fetal abnormality and damage
  • any associated maternal condition

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from O35 Maternal care for known or suspected fetal abnormality and damage
  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Also from chapter/block level (1 note)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (4 notes)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Includes

Further defines or gives examples of the content of the category.

Inherited from O35 Maternal care for known or suspected fetal abnormality and damage
  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy

Notes

Also from chapter/block level (6 notes)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
    • 1st trimester- less than 14 weeks 0 days
    • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
    • 3rd trimester- 28 weeks 0 days until delivery

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry

7th-character codes under O35.10 7