O48.1 Prolonged pregnancy

Billable ICD-10-CM code, FY2026.

Applicable to

• Pregnancy which has advanced beyond 42 completed weeks gestation

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 645.23 Prolonged pregnancy, 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.

Diagnosis Index entries for O48.1

• Post-dates (40-42 weeks) (pregnancy) (mother) › more than 42 weeks gestation
• Postmaturity, postmature (over 42 weeks) › maternal (over 42 weeks gestation)
• Post-term (40-42 weeks) (pregnancy) (mother) › more than 42 weeks gestation (mother)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › postmaturity (post-term) (40 to 42 weeks) › more than 42 completed weeks gestation (prolonged)
• Pregnancy (single) (uterine) › postmature (40 to 42 weeks) › more than 42 weeks gestation
• Pregnancy (single) (uterine) › prolonged (more than 42 weeks gestation)
• Prolonged, prolongation (of) › gestation (over 42 completed weeks) › mother
• Prolonged, prolongation (of) › pregnancy (more than 42 weeks gestation)

Nearby codes

• O48 Late pregnancy
• O48.0 Post-term pregnancy
• O48.1 Prolonged pregnancy (this code)