O09.A1 Supervision of pregnancy with history of molar pregnancy, first trimester

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

MS-DRG index

Defines the logic of DRG(s) 998 in MDC 14.

Approximate ICD-9-CM (GEMs)

• V23.1 Supervision of high-risk pregnancy with history of trophoblastic disease (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.
• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to O09.A1

Back-references to O09

• Type 1 Excludes: Z34 Encounter for supervision of normal pregnancy ("encounter for supervision of high risk pregnancy (O09.-)")
• Code First: Z3A Weeks of gestation ("obstetric condition or encounter for delivery (O09-O60, O80-O82, O94-O9A)")

Nearby codes

• O09.11 Supervision of pregnancy with history of ectopic pregnancy, first trimester
• O09.12 Supervision of pregnancy with history of ectopic pregnancy, second trimester
• O09.13 Supervision of pregnancy with history of ectopic pregnancy, third trimester
• O09.A Supervision of pregnancy with history of molar pregnancy
• O09.A0 Supervision of pregnancy with history of molar pregnancy, unspecified trimester
• O09.A1 Supervision of pregnancy with history of molar pregnancy, first trimester (this code)
• O09.A2 Supervision of pregnancy with history of molar pregnancy, second trimester
• O09.A3 Supervision of pregnancy with history of molar pregnancy, third trimester
• O09.2 Supervision of pregnancy with other poor reproductive or obstetric history
• O09.21 Supervision of pregnancy with history of pre-term labor
• O09.211 Supervision of pregnancy with history of pre-term labor, first trimester