I70.56 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene

ICD-10-CM 2027 diagnosis code · Diseases of arteries, arterioles and capillaries

Non-billable header

ICD-10-CM code I70.56

Code: I70.56 (claims format: I7056)
Description: Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene
Short description: Athscl nonaut bio bypass of the extremities w gangrene
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I70-I79 Diseases of arteries, arterioles and capillaries
Parent codes: I70 › I70.5

Billable codes under I70.56

I70.56 is a header code and cannot be used on claims. Choose the most specific code:

Notes for I70.56

Includes:

any condition classifiable to I70.51-, I70.52-, and I70.53-, I70.54-, I70.55
chronic limb-threatening ischemia of nonautologous biological bypass graft(s) of the extremities with gangrene
critical limb ischemia of nonautologous biological bypass graft(s) of the extremities with gangrene

Use additional code:

code to identify the severity of any ulcer (L97.-, L98.49-), if applicable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

I70 – Atherosclerosis

Includes:

arteriolosclerosis
arterial degeneration
arteriosclerosis
arteriosclerotic vascular disease
arteriovascular degeneration
atheroma
endarteritis deformans or obliterans
senile arteritis
senile endarteritis
vascular degeneration

Excludes2 (not included here):

arteriosclerotic cardiovascular disease (I25.1-)
arteriosclerotic heart disease (I25.1-)
atheroembolism (I75.-)
cerebral atherosclerosis (I67.2)
coronary atherosclerosis (I25.1-)
mesenteric atherosclerosis (K55.1)
precerebral atherosclerosis (I67.2)
primary pulmonary atherosclerosis (I27.0)

Use additional code:

code to identify:
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

I70.5 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities

Use additional code:

code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)

Related codes in I70.5

Frequently asked questions

What is ICD-10 code I70.56?

I70.56 is the ICD-10-CM code for atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene, in the block I70-I79 (Diseases of arteries, arterioles and capillaries).

Is I70.56 a billable code?

No. I70.56 is a header code with more specific child codes; report one of the billable codes listed above.

What category does I70.56 belong to?

It belongs to category I70 – Atherosclerosis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.