O63.1 Prolonged second stage (of labor)

Billable ICD-10-CM code, FY2026.

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 662.21 Prolonged second stage of labor, delivered, with or without mention of antepartum condition (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 O63.1

• Delivery (childbirth) (labor) › complicated › by › prolonged labor › second stage
• Long › labor › second stage
• Prolonged, prolongation (of) › labor › second stage

Nearby codes

• O63 Long labor
• O63.0 Prolonged first stage (of labor)
• O63.1 Prolonged second stage (of labor) (this code)
• O63.2 Delayed delivery of second twin, triplet, etc.
• O63.9 Long labor, unspecified