ICD-10-CM 2027
ICD-10 code for twin pregnancy
Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs
From the official ICD-10-CM alphabetic index entry “Pregnancy (single) (uterine) › twin”. Page updated September 29, 2026.
About coding twin pregnancy
The ICD-10-CM code for twin pregnancy is O30.00 (Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on O30.00.
Within O30.0, choose O30.00 (unspecified number of placenta and unspecified number of amniotic sacs) only when documentation doesn't support a more specific option: monochorionic/monoamniotic (O30.01), conjoined twin pregnancy (O30.02), monochorionic/diamniotic (O30.03), dichorionic/diamniotic (O30.04) and unable to determine number of placenta and number of amniotic sacs (O30.09).
To report this condition, pick the subcode that matches the documentation: O30.001 (first trimester), O30.002 (second trimester), O30.003 (third trimester) and O30.009 (unspecified trimester).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific twin pregnancy codes (official index)
- conjoined O30.02 — Conjoined twin pregnancy
- dichorionic/diamniotic (two placenta, two amniotic sacs) O30.04 — Twin pregnancy, dichorionic/diamniotic
- monochorionic/diamniotic (one placenta, two amniotic sacs) O30.03 — Twin pregnancy, monochorionic/diamniotic
- monochorionic/monoamniotic (one placenta, one amniotic sac) O30.01 — Twin pregnancy, monochorionic/monoamniotic
- unable to determine number of placenta and number of amniotic sacs O30.09 — Twin pregnancy, unable to determine number of placenta and number of amniotic sacs
- unspecified number of placenta and unspecified number of amniotic sacs O30.00 — Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs
Common questions about twin pregnancy ICD-10 codes
What is the ICD-10 code for twin pregnancy?
- O30.00 — Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: O30.02, O30.04, O30.03, O30.01 and others below.
What is the ICD-10 code for conjoined twin pregnancy?
- O30.02 — Conjoined twin pregnancy (header code; choose a more specific subcode).
What is the ICD-10 code for dichorionic/diamniotic twin pregnancy?
- O30.04 — Twin pregnancy, dichorionic/diamniotic (header code; choose a more specific subcode).
What is the ICD-10 code for monochorionic/diamniotic twin pregnancy?
- O30.03 — Twin pregnancy, monochorionic/diamniotic (header code; choose a more specific subcode).
What is the ICD-10 code for monochorionic/monoamniotic twin pregnancy?
- O30.01 — Twin pregnancy, monochorionic/monoamniotic (header code; choose a more specific subcode).
Is O30.00 billable?
- No. O30.00 is a header code. Report one of its more specific subcodes instead.