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.
Categories beginning with O
Open a category to continue through its complete hierarchy of more specific codes.
O00Ectopic pregnancyO01Hydatidiform moleO02Other abnormal products of conceptionO03Spontaneous abortionO04Complications following (induced) termination of pregnancyO07Failed attempted termination of pregnancyO08Complications following ectopic and molar pregnancyO09Supervision of high risk pregnancyO10Pre-existing hypertension complicating pregnancy, childbirth and the puerperiumO11Pre-existing hypertension with pre-eclampsiaO12Gestational [pregnancy-induced] edema and proteinuria without hypertensionO13Gestational [pregnancy-induced] hypertension without significant proteinuriaO14Pre-eclampsiaO15EclampsiaO16Unspecified maternal hypertensionO20Hemorrhage in early pregnancyO21Excessive vomiting in pregnancyO22Venous complications and hemorrhoids in pregnancyO23Infections of genitourinary tract in pregnancyO24Diabetes mellitus in pregnancy, childbirth, and the puerperiumO25Malnutrition in pregnancy, childbirth and the puerperiumO26Maternal care for other conditions predominantly related to pregnancyO28Abnormal findings on antenatal screening of motherO29Complications of anesthesia during pregnancyO30Multiple gestationO31Complications specific to multiple gestationO32Maternal care for malpresentation of fetusO33Maternal care for disproportionO34Maternal care for abnormality of pelvic organsO35Maternal care for known or suspected fetal abnormality and damageO36Maternal care for other fetal problemsO40PolyhydramniosO41Other disorders of amniotic fluid and membranesO42Premature rupture of membranesO43Placental disordersO44Placenta previaO45Premature separation of placenta [abruptio placentae]O46Antepartum hemorrhage, not elsewhere classifiedO47False laborO48Late pregnancyO60Preterm laborO61Failed induction of laborO62Abnormalities of forces of laborO63Long laborO64Obstructed labor due to malposition and malpresentation of fetusO65Obstructed labor due to maternal pelvic abnormalityO66Other obstructed laborO67Labor and delivery complicated by intrapartum hemorrhage, not elsewhere classifiedO68Labor and delivery complicated by abnormality of fetal acid-base balanceO69Labor and delivery complicated by umbilical cord complicationsO70Perineal laceration during deliveryO71Other obstetric traumaO72Postpartum hemorrhageO73Retained placenta and membranes, without hemorrhageO74Complications of anesthesia during labor and deliveryO75Other complications of labor and delivery, not elsewhere classifiedO76Abnormality in fetal heart rate and rhythm complicating labor and deliveryO77Other fetal stress complicating labor and deliveryO80Encounter for full-term uncomplicated deliveryO82Encounter for cesarean delivery without indicationO85Puerperal sepsisO86Other puerperal infectionsO87Venous complications and hemorrhoids in the puerperiumO88Obstetric embolismO89Complications of anesthesia during the puerperiumO90Complications of the puerperium, not elsewhere classifiedO91Infections of breast associated with pregnancy, the puerperium and lactationO92Other disorders of breast and disorders of lactation associated with pregnancy and the puerperiumO94Sequelae of complication of pregnancy, childbirth, and the puerperiumO98Maternal infectious and parasitic diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperiumO99Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperiumO9AMaternal malignant neoplasms, traumatic injuries and abuse classifiable elsewhere but complicating pregnancy, childbirth and the puerperiumSource and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
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.
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.