O30.109 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester

ICD-10-CM Diagnosis Code O30.109 Reference

ICD-10-CM code O30.109 identifies a triplet pregnancy where the number of placentas and amniotic sacs is unspecified, and the trimester is also unspecified. It is an active terminology finding within the maternal care chapter for pregnancy, childbirth, and the puerperium, specifically under maternal care related to the fetus and possible delivery problems. 1 4

Plain-language overview

Code O30.109 represents a finding of triplet pregnancy without specified details regarding the number of placentas, the number of amniotic sacs, or the trimester. 1

What this code represents

The code O30.109 is an active concept that falls under the parent code O30.10 for triplet pregnancy with unspecified placenta and amniotic sac details. 1

Code O30.109 is categorized within Chapter 15 for pregnancy, childbirth, and the puerperium, under the block for maternal care related to the fetus and possible delivery problems. 4

Coding details

The official terminology record assigns O30.109 a semantic type of finding and lists an abbreviation for triplet pregnancy with unspecified placenta and amniotic sacs in an unspecified trimester. 1

While S4 places O30.109 within the O30-O48 maternal care block, S5 lists the identical unspecified trimester label under the broader parent code O30.10 within the multiple gestation category. 4 5

Documentation considerations

The code O30.109 is designated for situations where the documentation does not specify the trimester or the number of placentas and amniotic sacs for a triplet pregnancy. 1

Clinical glossaries distinguish triplet pregnancies by chorionicity and amnionicity, such as trichorionic triplet pregnancies where each baby has a separate placenta and amniotic sac. 2

What the sources add

A phecode mapping resource lists O30.109 alongside related codes for twin and triplet pregnancies that specify trimesters or note an inability to determine placenta and amniotic sac numbers. 3

The terminology record for O30.109 indicates it has narrower concepts, while a separate code hierarchy source outlines its placement within the maternal care chapter and delivery problems block. 1 4

Sources

1. ICD-10-CM O30.109 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Twin and triplet pregnancy — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 651 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. ICD-10 | Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester (O30.109) — cdek.pharmacy.purdue.edu; accessed 2026-07-27.
5. ICD-10-CM Code O30.10 | Vero — veroscribe.com; accessed 2026-07-27.