What O00 covers · when clinicians use it
ICD-10 code O00 identifies Ectopic pregnancy in the U.S. ICD-10-CM clinical and billing record set. It sits within the Pregnancy, Childbirth & Puerperium chapter (O00–O9A), the section that groups related diagnoses so providers, payers, and public-health agencies report them consistently. Clinicians and medical coders apply O00 when an encounter's findings match the Ectopic pregnancy description, attaching it to the patient record so downstream insurance claims, payer audits, quality reporting, and epidemiological surveillance all reference the same standardized diagnosis. The ICD-10-CM is maintained by the Centers for Medicare & Medicaid Services and the CDC's National Center for Health Statistics, with an updated official code set released each U.S. fiscal year — always verify O00 against the current CMS/CDC release and your payer's documentation guidance before final use. This page summarizes documentation context for O00 and is a coding reference, not clinical, diagnostic, or billing advice.
O00 refers to Ectopic pregnancy, encompassing abnormal pregnancies such as ectopic implantation, molar growths, failed pregnancy attempts, spontaneous loss, and complications arising from pregnancy terminations.
Symptoms
- Pelvic or abdominal pain – Seen especially in ectopic pregnancy (O00)
- Vaginal bleeding – A key symptom in spontaneous abortion (O03) and abnormal conceptions (O02)
- Severe nausea and vomiting – Associated with hydatidiform mole (O01)
- Signs of infection – After incomplete or complicated pregnancy terminations (O04, O08)
- Persistent pregnancy symptoms without viable embryo – Suggestive of molar pregnancy (O01)
Diagnosis
Diagnosis of Ectopic pregnancy involves transvaginal ultrasound, serial beta-hCG measurements, pelvic examination, and sometimes surgical exploration (e.g., laparoscopy) to confirm ectopic implantation, molar growths, or retained products of conception.
ICD10 Code Usage
ICD10 code O00 is used by obstetricians, gynecologists, emergency physicians, and reproductive health providers to document early pregnancy complications, guide urgent or elective interventions, and ensure appropriate maternal follow-up care.
Related Codes
- O01 – Hydatidiform mole
- O02 – Other abnormal products of conception
- O03 – Spontaneous abortion
- O04 – Complications following (induced) termination of pregnancy
- O07 – Failed attempted termination of pregnancy
- O08 – Complications following ectopic and molar pregnancy
FAQs
Q1: What is ICD10 code O00?
A: It refers to Ectopic pregnancy, covering non-viable pregnancies, abnormal implantations, spontaneous losses, and post-pregnancy complications.
Q2: What is an ectopic pregnancy (O00)?
A: A pregnancy implanted outside the uterine cavity, often in a fallopian tube, posing a life-threatening risk if not treated promptly.
Q3: What is a hydatidiform mole (O01)?
A: A type of gestational trophoblastic disease where abnormal tissue grows inside the uterus instead of a normal embryo.
Q4: What causes spontaneous abortion (O03)?
A: Often due to chromosomal abnormalities, maternal infections, anatomical defects, or hormonal insufficiencies.
Q5: How are complications following pregnancy termination (O04, O07, O08) managed?
A: Management includes antibiotics for infections, surgical removal of retained tissue, supportive care, and counseling for physical and emotional recovery.
Conclusion
ICD10 code O00 provides essential documentation for the management of Ectopic pregnancy, allowing clinicians to deliver timely interventions, monitor maternal health, and reduce complications related to abnormal or failed pregnancies.