O ICD-10-CM Categories: Category Index
Browse 72 top-level ICD-10-CM categories beginning with O, then follow their complete FY 2027 child-code hierarchies.
Complete category list
Categories beginning with O
Open a category to continue through its complete hierarchy of more specific codes.
O00Ectopic pregnancy
O01Hydatidiform mole
O02Other abnormal products of conception
O03Spontaneous abortion
O04Complications following (induced) termination of pregnancy
O07Failed attempted termination of pregnancy
O08Complications following ectopic and molar pregnancy
O09Supervision of high risk pregnancy
O10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
O11Pre-existing hypertension with pre-eclampsia
O12Gestational [pregnancy-induced] edema and proteinuria without hypertension
O13Gestational [pregnancy-induced] hypertension without significant proteinuria
O14Pre-eclampsia
O15Eclampsia
O16Unspecified maternal hypertension
O20Hemorrhage in early pregnancy
O21Excessive vomiting in pregnancy
O22Venous complications and hemorrhoids in pregnancy
O23Infections of genitourinary tract in pregnancy
O24Diabetes mellitus in pregnancy, childbirth, and the puerperium
O25Malnutrition in pregnancy, childbirth and the puerperium
O26Maternal care for other conditions predominantly related to pregnancy
O28Abnormal findings on antenatal screening of mother
O29Complications of anesthesia during pregnancy
O30Multiple gestation
O31Complications specific to multiple gestation
O32Maternal care for malpresentation of fetus
O33Maternal care for disproportion
O34Maternal care for abnormality of pelvic organs
O35Maternal care for known or suspected fetal abnormality and damage
O36Maternal care for other fetal problems
O40Polyhydramnios
O41Other disorders of amniotic fluid and membranes
O42Premature rupture of membranes
O43Placental disorders
O44Placenta previa
O45Premature separation of placenta [abruptio placentae]
O46Antepartum hemorrhage, not elsewhere classified
O47False labor
O48Late pregnancy
O60Preterm labor
O61Failed induction of labor
O62Abnormalities of forces of labor
O63Long labor
O64Obstructed labor due to malposition and malpresentation of fetus
O65Obstructed labor due to maternal pelvic abnormality
O66Other obstructed labor
O67Labor and delivery complicated by intrapartum hemorrhage, not elsewhere classified
O68Labor and delivery complicated by abnormality of fetal acid-base balance
O69Labor and delivery complicated by umbilical cord complications
O70Perineal laceration during delivery
O71Other obstetric trauma
O72Postpartum hemorrhage
O73Retained placenta and membranes, without hemorrhage
O74Complications of anesthesia during labor and delivery
O75Other complications of labor and delivery, not elsewhere classified
O76Abnormality in fetal heart rate and rhythm complicating labor and delivery
O77Other fetal stress complicating labor and delivery
O80Encounter for full-term uncomplicated delivery
O82Encounter for cesarean delivery without indication
O85Puerperal sepsis
O86Other puerperal infections
O87Venous complications and hemorrhoids in the puerperium
O88Obstetric embolism
O89Complications of anesthesia during the puerperium
O90Complications of the puerperium, not elsewhere classified
O91Infections of breast associated with pregnancy, the puerperium and lactation
O92Other disorders of breast and disorders of lactation associated with pregnancy and the puerperium
O94Sequelae of complication of pregnancy, childbirth, and the puerperium
O98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
O99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
O9AMaternal malignant neoplasms, traumatic injuries and abuse classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
Transparency
Source and release
This category index is generated from Vero’s repository-backed ICD-10-CM hierarchy. Every listed category is a top-level record, and each linked category page exposes its direct child codes.
Review the CDC/NCHS ICD-10-CM sourceCategory navigation
Frequently asked questions
Which ICD-10-CM categories begin with O?
This index lists 72 top-level categories beginning with O from Vero’s FY 2027 U.S. ICD-10-CM reference dataset.
How do I find a more specific O code?
Open a category below, then follow its linked child-code hierarchy until you reach the code supported by the documentation.
Which ICD-10-CM release does this O index use?
The index uses the FY 2027 U.S. ICD-10-CM release and the repository-backed hierarchy displayed on each linked code page.
Is every O category billable?
No. These are top-level categories used for navigation. Follow the hierarchy to a sufficiently specific code and confirm the active code set, official guidance, and payer requirements.
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