Is I99 a billable ICD-10-CM code?

No. I99 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does I99 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Other and unspecified disorders of the circulatory system (I95-I99).

I99

I99 — Other and unspecified disorders of circulatory system

Non-billable headerICD-10-CM

I99 is a non-billable header ICD-10-CM code for other and unspecified disorders of circulatory system. It cannot be billed on its own: choose one of the more specific child codes below.

Risk adjustment

I99 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 I99

2 child codes. Green means billable.

I99.8Other disorder of circulatory system
I99.9Unspecified disorder of circulatory system

Questions about I99

Is I99 a billable ICD-10-CM code?: No. I99 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does I99 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Other and unspecified disorders of the circulatory system (I95-I99).