ICD-10-CM 2027
ICD-10 code for fetal dystocia
From the official ICD-10-CM alphabetic index entry “Dystocia › fetal”. Page updated September 29, 2026.
About coding fetal dystocia
The ICD-10-CM code for fetal dystocia is O66.9 (Obstructed labor, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on O66.9.
Within O66, choose O66.9 (Obstructed labor, unspecified) only when documentation doesn't support a more specific option: obstructed labor due to shoulder dystocia (O66.0), obstructed labor due to locked twins (O66.1), obstructed labor due to unusually large fetus (O66.2), obstructed labor due to other abnormalities of fetus (O66.3), failed trial of labor (O66.4), attempted application of vacuum extractor and forceps (O66.5), obstructed labor due to other multiple fetuses (O66.6) and other specified obstructed labor (O66.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
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 fetal dystocia codes (official index)
Common questions about fetal dystocia ICD-10 codes
What is the ICD-10 code for fetal dystocia?
- O66.9 — Obstructed labor, unspecified. More specific codes apply when the documentation supports them: O66.3, O66.3, O66.2.
What is the ICD-10 code for abnormality nec fetal dystocia?
- O66.3 — Obstructed labor due to other abnormalities of fetus.
What is the ICD-10 code for conjoined twins fetal dystocia?
- O66.3 — Obstructed labor due to other abnormalities of fetus.
What is the ICD-10 code for oversize fetal dystocia?
- O66.2 — Obstructed labor due to unusually large fetus.
Is O66.9 billable?
- Yes. O66.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O66.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O66.9 as a principal diagnosis.
Is O66.9 a CC or MCC?
- No. O66.9 is neither a CC nor an MCC under MS-DRG v44.0.