Is O16 a billable ICD-10-CM code?

No. O16 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O16 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16).

O16

O16 — Unspecified maternal hypertension

Non-billable headerICD-10-CM

O16 is a non-billable header ICD-10-CM code for unspecified maternal hypertension. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with O16

These codes carry an Excludes1 note pointing at O16. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O16 alone.

I10Essential (primary) hypertension

Risk adjustment

O16 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 O16

6 child codes. Green means billable.

Questions about O16

Is O16 a billable ICD-10-CM code?: No. O16 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O16 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16).