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

Billable

Is O66.3 billable?

Yes — O66.3 is billable for FY2027. O66.3 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O66.3 may be submitted for encounters from October 1, 2026 through September 30, 2027.

O66.3 at a glance

Code	O66.3
Description	Obstructed labor due to other abnormalities of fetus
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does O66.3 group to?

O66.3 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical

How is O66.3 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to O66.3. They show the wording a clinician may have documented, which often differs from the Tabular description.

Hydrops › causing obstructed labor
Deformity › fetal › causing obstructed labor
Dystocia › fetal › abnormality NEC
Dystocia › fetal › conjoined twins
Hydrocephalus › causing disproportion › with obstructed labor (acquired) (external) (internal) (malignant) (recurrent)
Delivery › complicated › by › fetal › deformity (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › conjoined twins (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › hydrocephalic fetus (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › fetal › abnormality NEC (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › fetal › ascites (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › fetal › hydrops (childbirth) (labor)
Delivery › complicated › by › obstructed labor › due to › dystocia › due to › fetal › meningomyelocele (childbirth) (labor)

Use additional code

Report an additional code alongside O66.3 to fully describe the condition. O66.3 is sequenced first.

code to identify cause of obstruction

Inclusion terms

Alternative wording in documentation that is classified to O66.3.

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

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O66.3 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

supervision of normal pregnancy (Z34.-)

Use additional code — inherited from Chapter 15

Report an additional code alongside O66.3 to fully describe the condition. O66.3 is sequenced first.

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Excludes2 — not included here — inherited from Chapter 15

The conditions below are not part of O66.3, but a patient may have both at the same time. When documentation supports it, O66.3 and the excluded code may both be reported.

mental and behavioral disorders associated with the puerperium (F53.-)
obstetrical tetanus (A34)
postpartum necrosis of pituitary gland (E23.0)
puerperal osteomalacia (M83.0)

How long has O66.3 existed?

O66.3 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with O66.3?

ICD-10-CM declares these codes mutually exclusive with O66.3 — exactly one of each pair can be correct for a given encounter.