Is O09.21 a billable ICD-10-CM code?

No. O09.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does O09.21 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Supervision of high risk pregnancy (O09).

O09.21

O09.21 — Supervision of pregnancy with history of pre-term labor

Non-billable headerICD-10-CM

O09.21 is a non-billable header ICD-10-CM code for supervision of pregnancy with history of pre-term 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 O09.21

These codes carry an Excludes1 note pointing at O09.21. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O09.21 alone.

Z87.51Personal history of pre-term labor

Risk adjustment

O09.21 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 O09.21

4 child codes. Green means billable.

Related codes at this level

Codes that share O09.2. If O09.21 is not quite right, the correct code is usually one of these.

O09.29Supervision of pregnancy with other poor reproductive or obstetric history

Questions about O09.21

Is O09.21 a billable ICD-10-CM code?: No. O09.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does O09.21 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Supervision of high risk pregnancy (O09).