ICD-10-CM Diagnosis Code O20.0 - Threatened abortion (original) (raw)

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ICD List 2025-2026 Edition

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Threatened abortion

ICD-10-CM Code:

O20.0

ICD-10 Code for:

Threatened abortion

Is Billable?

Yes - Valid for Submission

Chronic Condition Indicator: [1]

Not chronic

Code Navigator:

O20.0 is a billable diagnosis code used to specify a medical diagnosis of threatened abortion. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

The code O20.0 is applicable to female patients aged 12 through 55 years inclusive. It is clinically and virtually impossible to use this code on a non-female patient outside the stated age range.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.

  1. Code Information
  2. Approximate Synonyms
  3. Clinical Classification
  4. Clinical Information
  5. Tabular List of Diseases and Injuries
  6. Index to Diseases and Injuries References
  8. Code Edits
  9. Diagnostic Related Groups Mapping
  10. Convert to ICD-9 Code
  11. Patient Education
  12. Other Codes Used Similar Conditions
  13. Code History

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

CCSR Code: PRG009

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

vaginal bleeding preceding the 20th week of gestation.

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

References found for this diagnosis code in the External Cause of Injuries Index:

The Medicare Code Editor (MCE) detects errors and inconsistencies in ICD-10-CM diagnosis coding that can affect Medicare claim validity. These Medicare code edits help medical coders and billing professionals determine when a diagnosis code is not appropriate as a principal diagnosis, does not meet coverage criteria. Use this list to verify whether a code is valid for Medicare billing and to avoid claim rejections or denials due to diagnosis coding issues.

The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

ICD-9-CM: 640.03

Approximate Flag - The approximate mapping means this ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option, but it may not fully capture the original diagnosis or clinical intent.

Miscarriage

What is a miscarriage?

A miscarriage is an unexpected loss of pregnancy before the 20th week. Most miscarriages happen very early in the pregnancy, often before a woman even knows she is pregnant.

What causes a miscarriage?

A miscarriage can happen in any pregnancy. Most miscarriages occur because the fetus doesn't develop properly. This is often linked to a genetic problem with the fetus, such as an extra or missing chromosome.

In many cases, the cause of a miscarriage is unknown. Some possible factors that may increase the chance of a miscarriage can include:

What are the signs of a miscarriage?

The signs of a miscarriage may be different for everyone and can vary based on how far along you are in your pregnancy.

Signs of a miscarriage can include:

Sometimes, it's hard to know what's normal during pregnancy. If something seems unusual or is worrying you, talk to your provider.

How is a miscarriage diagnosed?

To check if you have had a miscarriage, your provider may do the following:

What is the treatment for a miscarriage?

Treatment after a miscarriage often depends on when it occurs during the pregnancy. If you miscarry early in your pregnancy, you may not need any treatment. If you are 12 or more weeks pregnant, you may need a shot to prevent problems with the Rh factor in future pregnancies.

In some cases, tissue is left in the uterus. If you don't have any signs of infection, your provider may recommend waiting for the tissue to pass naturally. If you need treatment to remove the tissue, it can include:

No matter when it occurs, losing a pregnancy can be difficult. Counseling may help you cope with your grief. Later, if you decide to try to get pregnant again, talk with your provider to understand any risks. Many women who have a miscarriage go on to have healthy pregnancies later.

Can a miscarriage be prevented?

Miscarriage can affect anyone and often can't be prevented. Focus on taking good care of yourself and start prenatal care visits early in your pregnancy.

NIH: National Institute of Child Health and Human Development

[Learn More in MedlinePlus]