O66.4 — Failed trial of labor

Not billable

Is O66.4 billable?

No — O66.4 is a non-billable header code. O66.4 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 2 billable codes beneath O66.4.

Billable codes under this header

O66.4 at a glance

Code	O66.4
Description	Failed trial of labor
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O66.4 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 O66.4 to fully describe the condition. O66.4 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 O66.4, but a patient may have both at the same time. When documentation supports it, O66.4 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)

What codes fall under O66.4? (2)

How long has O66.4 existed?

O66.4 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.