O34.0
Maternal care for congenital malformation of uterus
O34.0 is a non-billable ICD-10-CM code header for maternal care for congenital malformation of uterus. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are O34.00 Maternal care for unspecified congenital malformation of uterus, unspecified trimester; O34.01 Maternal care for unspecified congenital malformation of uterus, first trimester; O34.02 Maternal care for unspecified congenital malformation of uterus, second trimester and O34.03 Maternal care for unspecified congenital malformation of uterus, third trimester. Its coding notes include a Code first instruction, a Use additional code instruction, 1 Excludes1 entry and 4 Excludes2 entries.
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.
Code first
If the underlying condition listed here is present and known, sequence it first.
Use additional code
Add the listed code as a secondary code, if known.
- code for specific condition
Also from chapter/block level (1 note)
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (1 note)
- 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)
Includes
Further defines or gives examples of the content of the category.
- the listed conditions as a reason for hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
Inclusion terms
Conditions classified to this code.
- Maternal care for double uterus
- Maternal care for uterus bicornis
Notes
Also from chapter/block level (6 notes)
- 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. 5 entries
- Double, uterus, in pregnancy or childbirth
- Pregnancy (single) (uterine), complicated by (care of) (management affected by), abnormal, abnormality, uterus, congenital
- Pregnancy (single) (uterine), complicated by (care of) (management affected by), bicornis or bicornuate uterus
- Pregnancy (single) (uterine), complicated by (care of) (management affected by), double uterus
- Pregnancy (single) (uterine), complicated by (care of) (management affected by), malformation, uterus (congenital)
More specific codes under O34.0 4
- O34.00Maternal care for unspecified congenital malformation of uterus, unspecified trimesterBillable
- O34.01Maternal care for unspecified congenital malformation of uterus, first trimesterBillable
- O34.02Maternal care for unspecified congenital malformation of uterus, second trimesterBillable
- O34.03Maternal care for unspecified congenital malformation of uterus, third trimesterBillable