Is I23 a billable ICD-10-CM code?

No. I23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does I23 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).

I23

I23 — Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

Non-billable headerICD-10-CM

I23 is a non-billable header ICD-10-CM code for certain current complications following st elevation (stemi) and non-st elevation (nstemi) myocardial infarction (within the 28 day period). It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with I23

These codes carry an Excludes1 note pointing at I23. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I23 alone.

I20Angina pectoris
I24.1Dressler's syndrome
I31.2Hemopericardium, not elsewhere classified
I51.0Cardiac septal defect, acquired
I51.1Rupture of chordae tendineae, not elsewhere classified
I51.2Rupture of papillary muscle, not elsewhere classified
I51.3Intracardiac thrombosis, not elsewhere classified

Risk adjustment

I23 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 I23

9 child codes. Green means billable.

Questions about I23

Is I23 a billable ICD-10-CM code?: No. I23 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does I23 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).