Is I77.77 a billable ICD-10-CM code?

Yes. I77.77 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I77.77 sit in the tabular list?

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

I77.77

I77.77 — Dissection of artery of lower extremity

Billable / specific codeICD-10-CM

I77.77 is a billable, specific ICD-10-CM code for dissection of artery of lower extremity. It is valid for submission on a claim.

Excludes2 inherited from the categories above I77.77

Also inherited, and the opposite of Excludes1: these conditions are not part of I77.77, but a patient can have both, so you may code both.

Written on I77.7 — Other arterial dissection

dissection of aorta (I71.0-)
dissection of coronary artery (I25.42)

Written on I77 — Other disorders of arteries and arterioles

collagen (vascular) diseases (M30-M36)
hypersensitivity angiitis (M31.0)
pulmonary artery (I28.-)

Risk adjustment

I77.77 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

I77.77 is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
A56747Billing and Coding: Magnetic Resonance Angiography (MRA)
A56758Billing and Coding: Non-Invasive Vascular Studies
A56775Billing and Coding: Magnetic Resonance Angiography

How I77.77 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 I77.77.

Dissection›artery›extremity›lower

Code history

I77.77 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share I77.7. If I77.77 is not quite right, the correct code is usually one of these.

Questions about I77.77

Is I77.77 a billable ICD-10-CM code?: Yes. I77.77 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I77.77 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).