ICD-10-CM 2027
ICD-10 code for labor long
Long labor, unspecified
From the official ICD-10-CM alphabetic index entry “Long › labor”. Page updated September 29, 2026.
About coding labor long
The ICD-10-CM code for labor long is O63.9 (Long labor, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on O63.9.
Within O63, choose O63.9 (unspecified) only when documentation doesn't support a more specific option: prolonged first stage (of labor) (O63.0), prolonged second stage (of labor) (O63.1) and delayed delivery of second twin, triplet, etc. (O63.2).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC, relative weight 2.0534), DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC, relative weight 1.2942), DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC, relative weight 0.7739), DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC, relative weight 1.1558), DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC, relative weight 0.7585) and DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC, relative weight 0.5002), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific labor long codes (official index)
Common questions about labor long ICD-10 codes
What is the ICD-10 code for labor long?
- O63.9 — Long labor, unspecified. More specific codes apply when the documentation supports them: O63.0, O63.1.
What is the ICD-10 code for first stage labor long?
- O63.0 — Prolonged first stage (of labor).
What is the ICD-10 code for second stage labor long?
- O63.1 — Prolonged second stage (of labor).
Is O63.9 billable?
- Yes. O63.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O63.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O63.9 as a principal diagnosis.
Is O63.9 a CC or MCC?
- O63.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.