O30.123 Triplet pregnancy with two or more monoamniotic fetuses, third trimester

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from O30 Multiple gestation

Code also

• any complications specific to multiple gestation

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 651.11 Triplet pregnancy, delivered, with or without mention of antepartum condition (approximate)
• 651.13 Triplet pregnancy, antepartum condition or complication (approximate)
• V91.12 Triplet gestation, with two or more monoamniotic fetuses (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.

Nearby codes

• O30.113 Triplet pregnancy with two or more monochorionic fetuses, third trimester
• O30.119 Triplet pregnancy with two or more monochorionic fetuses, unspecified trimester
• O30.12 Triplet pregnancy with two or more monoamniotic fetuses
• O30.121 Triplet pregnancy with two or more monoamniotic fetuses, first trimester
• O30.122 Triplet pregnancy with two or more monoamniotic fetuses, second trimester
• O30.123 Triplet pregnancy with two or more monoamniotic fetuses, third trimester (this code)
• O30.129 Triplet pregnancy with two or more monoamniotic fetuses, unspecified trimester
• O30.13 Triplet pregnancy, trichorionic/triamniotic
• O30.131 Triplet pregnancy, trichorionic/triamniotic, first trimester
• O30.132 Triplet pregnancy, trichorionic/triamniotic, second trimester
• O30.133 Triplet pregnancy, trichorionic/triamniotic, third trimester