Is O66 a billable ICD-10-CM code?

No. O66 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O66 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Complications of labor and delivery (O60-O77).

O66

O66 — Other obstructed labor

Non-billable headerICD-10-CM

O66 is a non-billable header ICD-10-CM code for other obstructed labor. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with O66

These codes carry an Excludes1 note pointing at O66. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O66 alone.

O33Maternal care for disproportion
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

Risk adjustment

O66 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead O66

9 child codes. Green means billable.

Questions about O66

Is O66 a billable ICD-10-CM code?: No. O66 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O66 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Complications of labor and delivery (O60-O77).