I99.9 — Unspecified disorder of circulatory system
I99.9 is a billable, specific ICD-10-CM code for unspecified disorder of circulatory system. It is valid for submission on a claim.
Risk adjustment
I99.9 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.
Medicare coverage
I99.9 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52996Billing and Coding: Routine Foot Care
How I99.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I99.9.
- Angiopathia, angiopathy
- Change›circulatory
- Change›vascular
- Circulation›defective(lower extremity)
- Complication›vascular
- Damage›vascular
- Defect, defective›circulation
- Defect, defective›vascular(local)
- Deficiency, deficient›vascular
- Disease, diseased›vascular
- Disturbance›circulatory
- Disturbance›vascular
Related codes at this level
Codes that share I99. If I99.9 is not quite right, the correct code is usually one of these.
Questions about I99.9
- Is I99.9 a billable ICD-10-CM code?
- Yes. I99.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I99.9 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).