O34.591 Maternal care for other abnormalities of gravid uterus, first 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

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 654.41 Other abnormalities in shape or position of gravid uterus and of neighboring structures, delivered, with or without mention of antepartum condition (approximate)
• 654.42 Other abnormalities in shape or position of gravid uterus and of neighboring structures, delivered, with mention of postpartum complication (approximate)
• 654.43 Other abnormalities in shape or position of gravid uterus and of neighboring structures, antepartum condition or complication (approximate)
• 654.44 Other abnormalities in shape or position of gravid uterus and of neighboring structures, postpartum condition or complication (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 O34.591

Back-references to O34.5

• Type 1 Excludes: N81 Female genital prolapse ("genital prolapse complicating pregnancy, labor or delivery (O34.5-)")
• Type 1 Excludes: N85.4 Malposition of uterus ("malposition of uterus complicating pregnancy, labor or delivery (O34.5-, O65.5)")

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.-)")

Nearby codes

• O34.531 Maternal care for retroversion of gravid uterus, first trimester
• O34.532 Maternal care for retroversion of gravid uterus, second trimester
• O34.533 Maternal care for retroversion of gravid uterus, third trimester
• O34.539 Maternal care for retroversion of gravid uterus, unspecified trimester
• O34.59 Maternal care for other abnormalities of gravid uterus
• O34.591 Maternal care for other abnormalities of gravid uterus, first trimester (this code)
• O34.592 Maternal care for other abnormalities of gravid uterus, second trimester
• O34.593 Maternal care for other abnormalities of gravid uterus, third trimester
• O34.599 Maternal care for other abnormalities of gravid uterus, unspecified trimester
• O34.6 Maternal care for abnormality of vagina
• O34.60 Maternal care for abnormality of vagina, unspecified trimester