O46.91 Antepartum hemorrhage, unspecified, first trimester

Billable ICD-10-CM code, FY2026.

Applies from O46 Antepartum hemorrhage, not elsewhere classified

Excludes1 (never code together)

• hemorrhage in early pregnancy (O20.-)
• intrapartum hemorrhage NEC (O67.-)
• placenta previa (O44.-)
• premature separation of placenta [abruptio placentae] (O45.-)

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 641.91 Unspecified antepartum hemorrhage, delivered, with or without mention of antepartum condition (approximate)
• 641.93 Unspecified antepartum hemorrhage, antepartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O46.91

Back-references to O46

• Type 1 Excludes: O67 Labor and delivery complicated by intrapartum hemorrhage, not elsewhere classified ("antepartum hemorrhage NEC (O46.-)")

Nearby codes

• 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, unspecified
• O46.90 Antepartum hemorrhage, unspecified, unspecified trimester
• O46.91 Antepartum hemorrhage, unspecified, first trimester (this code)
• O46.92 Antepartum hemorrhage, unspecified, second trimester
• O46.93 Antepartum hemorrhage, unspecified, third trimester