Antepartum hemorrhage, not elsewhere classified (O46) ICD-10-CM
The O46 code range covers antepartum hemorrhage, not elsewhere classified with 33 ICD-10-CM diagnosis codes. 24 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the O46 Range 33 codes · 24 billable
- O46 Antepartum hemorrhage, not elsewhere classifiedNon-billable
- O46.0 Antepartum hemorrhage with coagulation defectNon-billable
- O46.00 Antepartum hemorrhage with coagulation defect, unspecifiedNon-billable
- O46.001 Antepartum hemorrhage with coagulation defect, unspecified, first trimester
- O46.002 Antepartum hemorrhage with coagulation defect, unspecified, second trimester
- O46.003 Antepartum hemorrhage with coagulation defect, unspecified, third trimester
- O46.009 Antepartum hemorrhage with coagulation defect, unspecified, unspecified trimester
- O46.01 Antepartum hemorrhage with afibrinogenemiaNon-billable
- O46.011 Antepartum hemorrhage with afibrinogenemia, first trimester
- O46.012 Antepartum hemorrhage with afibrinogenemia, second trimester
- O46.013 Antepartum hemorrhage with afibrinogenemia, third trimester
- O46.019 Antepartum hemorrhage with afibrinogenemia, unspecified trimester
- O46.02 Antepartum hemorrhage with disseminated intravascular coagulationNon-billable
- O46.021 Antepartum hemorrhage with disseminated intravascular coagulation, first trimester
- O46.022 Antepartum hemorrhage with disseminated intravascular coagulation, second trimester
- O46.023 Antepartum hemorrhage with disseminated intravascular coagulation, third trimester
- O46.029 Antepartum hemorrhage with disseminated intravascular coagulation, unspecified trimester
- O46.09 Antepartum hemorrhage with other coagulation defectNon-billable
- O46.091 Antepartum hemorrhage with other coagulation defect, first trimester
- O46.092 Antepartum hemorrhage with other coagulation defect, second trimester
- O46.093 Antepartum hemorrhage with other coagulation defect, third trimester
- O46.099 Antepartum hemorrhage with other coagulation defect, unspecified trimester
- O46.8 Other antepartum hemorrhageNon-billable
- O46.8X Other antepartum hemorrhageNon-billable
- O46.8X1 Other antepartum hemorrhage, first trimester
- O46.8X2 Other antepartum hemorrhage, second trimester
- O46.8X3 Other antepartum hemorrhage, third trimester
- O46.8X9 Other antepartum hemorrhage, unspecified trimester
- O46.9 Antepartum hemorrhage, unspecifiedNon-billable
- O46.90 Antepartum hemorrhage, unspecified, unspecified trimester
- O46.91 Antepartum hemorrhage, unspecified, first trimester
- O46.92 Antepartum hemorrhage, unspecified, second trimester
- O46.93 Antepartum hemorrhage, unspecified, third trimester
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O46 range.
Afibrinogenemia
A deficiency or absence of FIBRINOGEN in the blood.
Fibrinogen
Plasma glycoprotein clotted by thrombin, composed of a dimer of three non-identical pairs of polypeptide chains (alpha, beta, gamma) held together by disulfide bonds. Fibrinogen clotting is a sol-gel change involving complex molecular arrangements: whereas fibrinogen is cleaved by thrombin to form polypeptides A and B, the proteolytic action of other enzymes yields different fibrinogen degradation products.
About the O46 Code Range
```htmlThe O46 ICD-10 code section is used for coding various types of antepartum hemorrhage, which refers to bleeding occurring during pregnancy before labor begins. These codes capture conditions ranging from general bleeding to those complicated by specific coagulation defects.
This section includes codes identifying antepartum hemorrhage with underlying clotting problems such as afibrinogenemia, disseminated intravascular coagulation, or other coagulation defects, often further specified by the trimester of pregnancy. For example, hemorrhage associated with afibrinogenemia (also known as hypofibrinogenemia) is coded under O46.01 and its subcategories. The codes also distinguish bleeding in the first, second, or third trimester, which helps clarify the timing and clinical context. Additionally, O46.8X codes cover other causes of antepartum hemorrhage, including bleeding linked to trauma or conditions like uterine leiomyoma or cervical erosion. Unspecified antepartum hemorrhage codes, such as O46.9, apply when the exact cause or trimester is unknown. Medical coders use these codes specifically to classify bleeding during pregnancy, ensuring accurate documentation of these complex obstetric conditions.
```Questions About This Page
How many billable codes are in the O46 range?
Of the 33 codes in this range, 24 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O46 range classify?
The range classifies antepartum hemorrhage, not elsewhere classified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
