| Full description | Twin pregnancy, monochorionic/diamniotic, unspecified trimester |
| Billable | Yes |
| Chapter | Chapter 15: Pregnancy, childbirth and the puerperium (O00-O9A) |
| Section | Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48) |
| Parent code | O30.03 — Twin pregnancy, monochorionic/diamniotic |