Is I73 a billable ICD-10-CM code?

No. I73 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does I73 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).

I73

I73 — Other peripheral vascular diseases

Non-billable headerICD-10-CM

I73 is a non-billable header ICD-10-CM code for other peripheral vascular diseases. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

chilblains (T69.1)
frostbite (T33-T34)
immersion hand or foot (T69.0-)
spasm of cerebral artery (G45.9)

Other codes that can never be billed with I73

These codes carry an Excludes1 note pointing at I73. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I73 alone.

R20.2Paresthesia of skin
R23.0Cyanosis
I96Gangrene, not elsewhere classified

Risk adjustment

I73 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 I73

4 child codes. Green means billable.

Questions about I73

Is I73 a billable ICD-10-CM code?: No. I73 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does I73 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).