O09.73 Supervision of high risk pregnancy due to social problems, third 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)

• V23.89 Supervision of other high-risk pregnancy (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 O09.73

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

• O09.629 Supervision of young multigravida, unspecified trimester
• O09.7 Supervision of high risk pregnancy due to social problems
• O09.70 Supervision of high risk pregnancy due to social problems, unspecified trimester
• O09.71 Supervision of high risk pregnancy due to social problems, first trimester
• O09.72 Supervision of high risk pregnancy due to social problems, second trimester
• O09.73 Supervision of high risk pregnancy due to social problems, third trimester (this code)
• O09.8 Supervision of other high risk pregnancies
• O09.81 Supervision of pregnancy resulting from assisted reproductive technology
• O09.811 Supervision of pregnancy resulting from assisted reproductive technology, first trimester
• O09.812 Supervision of pregnancy resulting from assisted reproductive technology, second trimester
• O09.813 Supervision of pregnancy resulting from assisted reproductive technology, third trimester