DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O66 Other obstructed labor

  • Header · not billable

O66 is not billable. The category heads 10 billable codes in FY2027, grouped under 9 subdivisions.

Index → code

  • Dystocia → O66.9
  • Locked twins causing obstructed labor → O66.1
  • Dystociafetal → O66.9

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O60-O77 Complications of labor and delivery (O60-O77)
  3. O66 Other obstructed labor
Billable codes
10
Subdivisions
9
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
45

Codes in O66

  1. O66.0
    Obstructed labor due to shoulder dystocia
    Billable
    Inclusion terms 1

    Inclusion terms

    • Impacted shoulders
  2. O66.1
    Obstructed labor due to locked twins
    Billable
  3. O66.2
    Obstructed labor due to unusually large fetus
    Billable
  4. O66.3
    Obstructed labor due to other abnormalities of fetus
    Billable
    Inclusion terms 6, Use additional code 1

    Inclusion terms

    • 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

    Use additional code

    • code to identify cause of obstruction
  5. O66.4
    Failed trial of labor
    Header
  6. O66.40
    Failed trial of labor, unspecified
    Billable
  7. O66.41
    Failed attempted vaginal birth after previous cesarean delivery
    Billable
    Code first 1

    Code first

    • rupture of uterus, if applicable (O71.0-, O71.1) O71.0 O71.1
  8. O66.5
    Attempted application of vacuum extractor and forceps
    BillableExempt
    Inclusion terms 1

    Inclusion terms

    • Attempted application of vacuum or forceps, with subsequent delivery by forceps or cesarean delivery
  9. O66.6
    Obstructed labor due to other multiple fetuses
    Billable
  10. O66.8
    Other specified obstructed labor
    Billable
    Use additional code 1

    Use additional code

    • code to identify cause of obstruction
  11. O66.9
    Obstructed labor, unspecified
    Billable
    Inclusion terms 3

    Inclusion terms

    • Dystocia NOS
    • Fetal dystocia NOS
    • Maternal dystocia NOS

Sources of each column.

Instructions

Notes that also apply

Chapter 15 instructions (Notes 6, Excludes1 1, Excludes2 4, Use additional code 1): printed on the chapter 15 page.

Index entries

  • Locked twins causing obstructed labor → O66.1
  • Dystocia → O66.9
  • Dystociashoulder (girdle) → O66.0
  • Impaction, impactedshoulder, causing obstructed labor → O66.0
  • Hydropscausing obstructed labor (mother) → O66.3
  • Failure, failedtrial of labor (with subsequent cesarean delivery) → O66.40
  • Delivery (childbirth) (labor)forceps, low following failed vacuum extraction → O66.5
  • Failure, failedforceps NOS (with subsequent cesarean delivery) → O66.5
  • Failure, failedvacuum extraction NOS (with subsequent cesarean delivery) → O66.5
  • Failure, failedventouse NOS (with subsequent cesarean delivery) → O66.5
  • Dystociafetal → O66.9
  • Dystociamaternal → O66.9
  • Dystociashoulder (girdle)causing obstructed labor → O66.0
  • Dystociafetaloversize → O66.2
  • Deformityfetalcausing obstructed labor → O66.3
  • Dystociafetalabnormality NEC → O66.3
  • Dystociafetalconjoined twins → O66.3
  • Hydrocephalus (acquired) (external) (internal) (malignant) (recurrent)causing disproportionwith obstructed labor → O66.3
  • Failure, failedtrial of labor (with subsequent cesarean delivery)following previous cesarean delivery → O66.41
  • Delay, delayedany plane in pelviscomplicating delivery → O66.9
  • Delivery (childbirth) (labor)cesarean (for)failedtrial of labor NOS → O66.40
  • Delivery (childbirth) (labor)cesarean (for)failedforceps → O66.5
  • Delivery (childbirth) (labor)cesarean (for)failedvacuum extraction → O66.5
  • Delivery (childbirth) (labor)cesarean (for)failedventouse → O66.5
  • Delivery (childbirth) (labor)complicatedbyattempted vacuum extraction and forceps → O66.5
  • Delivery (childbirth) (labor)complicatedbyfetaldeformity → O66.3
  • Delivery (childbirth) (labor)complicatedbyfailedtrial of labor → O66.40
  • Delivery (childbirth) (labor)cesarean (for)failedtrial of labor NOSfollowing previous cesarean delivery → O66.41
  • Delivery (childbirth) (labor)complicatedbyfailedattempted vaginal birth after previous cesarean delivery → O66.41
  • Delivery (childbirth) (labor)complicatedbydilatationbladder → O66.8
  • Delivery (childbirth) (labor)complicatedbyobstructed laborspecified NEC → O66.8
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue toimpacted shoulders → O66.0
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue tolocked twins → O66.1
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue tolarge fetus → O66.2
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue tomultiple fetuses NEC → O66.6
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue todystocia (fetal) → O66.9
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue todystocia (fetal)shoulder → O66.0
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue todystocia (fetal)due toconjoined twins → O66.3
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue todystocia (fetal)due tohydrocephalic fetus → O66.3
  • Delivery (childbirth) (labor)complicatedbyobstructed labordue todystocia (fetal)due tofetalabnormality NEC → O66.3

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