O30.042 Twin pregnancy, dichorionic/diamniotic, second trimester

Billable ICD-10-CM code, FY2026.

Applies from O30 Multiple gestation

Code also

• any complications specific to multiple gestation

Applies from O30.04 Twin pregnancy, dichorionic/diamniotic

Applicable to

• Twin pregnancy, two placentae, two amniotic sacs

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 651.01 Twin pregnancy, delivered, with or without mention of antepartum condition (approximate)
• 651.03 Twin pregnancy, antepartum condition or complication (approximate)
• V91.03 Twin gestation, dichorionic/diamniotic (two placentae, two amniotic sacs) (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

• O30.032 Twin pregnancy, monochorionic/diamniotic, second trimester
• O30.033 Twin pregnancy, monochorionic/diamniotic, third trimester
• O30.039 Twin pregnancy, monochorionic/diamniotic, unspecified trimester
• O30.04 Twin pregnancy, dichorionic/diamniotic
• O30.041 Twin pregnancy, dichorionic/diamniotic, first trimester
• O30.042 Twin pregnancy, dichorionic/diamniotic, second trimester (this code)
• O30.043 Twin pregnancy, dichorionic/diamniotic, third trimester
• O30.049 Twin pregnancy, dichorionic/diamniotic, unspecified trimester
• O30.09 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs
• O30.091 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester
• O30.092 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester