Is O13 a billable ICD-10-CM code?

No. O13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O13 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).

O13

O13 — Gestational [pregnancy-induced] hypertension without significant proteinuria

Non-billable headerICD-10-CM

O13 is a non-billable header ICD-10-CM code for gestational [pregnancy-induced] hypertension without significant proteinuria. It cannot be billed on its own: choose one of the more specific child codes below.

Includes

Conditions this code covers.

gestational hypertension NOS
transient hypertension of pregnancy

Other codes that can never be billed with O13

These codes carry an Excludes1 note pointing at O13. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O13 alone.

I10Essential (primary) hypertension

Risk adjustment

O13 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 O13

6 child codes. Green means billable.

Questions about O13

Is O13 a billable ICD-10-CM code?: No. O13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O13 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).