O34.00 Maternal care for unspecified congenital malformation of uterus, unspecified trimester

Billable ICD-10-CM code, FY2026.

Applies from O34 Maternal care for abnormality of pelvic organs

Includes

• the listed conditions as a reason for hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor

Code first

• any associated obstructed labor (O65.5)

Use additional code

• code for specific condition

Applies from O34.0 Maternal care for congenital malformation of uterus

Applicable to

• Maternal care for double uterus
• Maternal care for uterus bicornis

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 654.00 Congenital abnormalities of uterus, unspecified as to episode of care or not applicable (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O34.00

Back-references to O34

• Use Additional: O65.5 Obstructed labor due to abnormality of maternal pelvic organs ("code to identify abnormality of pelvic organs O34.-")
• Type 2 Excludes: O99.8 Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium ("maternal care for known or suspected abnormality of maternal pelvic organs (O34.-)")

Diagnosis Index entries for O34.00

• Bicornate or bicornis uterus › in pregnancy or childbirth
• Unicornate uterus › in pregnancy or childbirth

Nearby codes

• O34 Maternal care for abnormality of pelvic organs
• O34.0 Maternal care for congenital malformation of uterus
• O34.00 Maternal care for unspecified congenital malformation of uterus, unspecified trimester (this code)
• O34.01 Maternal care for unspecified congenital malformation of uterus, first trimester
• O34.02 Maternal care for unspecified congenital malformation of uterus, second trimester
• O34.03 Maternal care for unspecified congenital malformation of uterus, third trimester
• O34.1 Maternal care for benign tumor of corpus uteri
• O34.10 Maternal care for benign tumor of corpus uteri, unspecified trimester