| Full description | Maternal care for abnormalities of the fetal heart rate or rhythm, first trimester, fetus 1 |
| 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 | O36.831 — Matern care for abnlt of fetal heart rate or rhym, first tri |