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O66.3

O66.3: Obstructed labor due to other abnormalities of fetus

Billable / specific codeICD-10-CM

O66.3 is a billable, specific ICD-10-CM code for obstructed labor due to other abnormalities of fetus. It is valid for submission on a claim.

Check O66.3 with the rest of the claim: free scrubber

Use additional code

Add a secondary code to capture the detail described below.

  • code to identify cause of obstruction

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Dystocia due to fetal ascites
  • Dystocia due to fetal hydrops
  • Dystocia due to fetal meningomyelocele
  • Dystocia due to fetal sacral teratoma
  • Dystocia due to fetal tumor
  • Dystocia due to hydrocephalic fetus

Other codes that can never be billed with O66.3

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • O33.7Maternal care for disproportion due to other fetal deformities
  • O33.7XX0Maternal care for disproportion due to other fetal deformities, not applicable or unspecified
  • O33.7XX1Maternal care for disproportion due to other fetal deformities, fetus 1
  • O33.7XX2Maternal care for disproportion due to other fetal deformities, fetus 2
  • O33.7XX3Maternal care for disproportion due to other fetal deformities, fetus 3
  • O33.7XX4Maternal care for disproportion due to other fetal deformities, fetus 4
  • O33.7XX5Maternal care for disproportion due to other fetal deformities, fetus 5
  • O33.7XX9Maternal care for disproportion due to other fetal deformities, other fetus

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Hydrops›causing obstructed labor(mother)
  • Deformity›fetal›causing obstructed labor
  • Dystocia›fetal›abnormality NEC
  • Dystocia›fetal›conjoined twins
  • Hydrocephalus›causing disproportion›with obstructed labor
  • Delivery›complicated›by›fetal›deformity
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›conjoined twins
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›hydrocephalic fetus
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›fetal›abnormality NEC
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›fetal›ascites
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›fetal›hydrops
  • Delivery›complicated›by›obstructed labor›due to›dystocia›due to›fetal›meningomyelocele

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under O66

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.