I70.56
Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 18 never code together
I70code
Excludes2
- arteriosclerotic cardiovascular disease (I25.1-)I25.1-
- arteriosclerotic heart disease (I25.1-)I25.1-
- atheroembolism (I75.-)I75.-
- cerebral atherosclerosis (I67.2)I67.2
- coronary atherosclerosis (I25.1-)I25.1-
- mesenteric atherosclerosis (K55.1)K55.1
- precerebral atherosclerosis (I67.2)I67.2
- primary pulmonary atherosclerosis (I27.0)I27.0
I00-I99chapter
Excludes2
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
- systemic connective tissue disorders (M30-M36)M30-M36
- transient cerebral ischemic attacks and related syndromes (G45.-)G45.-
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 21
I70code
Includes
- arteriolosclerosis
- arterial degeneration
- arteriosclerosis
- arteriosclerotic vascular disease
- arteriovascular degeneration
- atheroma
- endarteritis deformans or obliterans
- senile arteritis
- senile endarteritis
- vascular degeneration
I70.56code
Includes
- any condition classifiable to I70.51-, I70.52-, and I70.53-, I70.54-, I70.55I70.51-I70.52-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
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 7 same parent — I70.5
I70.50 Unsp athscl nonautologous bio bypass of the extremities category I70.51 Athscl nonaut bio bypass of the extremities intrmt claud category I70.52 Athscl nonaut bio bypass of the extremities w rest pain category I70.53 Athscl nonaut bio bypass of the right leg w ulceration category I70.54 Athscl nonautologous bio bypass of the left leg w ulceration category I70.55 Athscl nonautologous bio bypass of extremity w ulceration I70.59 Oth athscl nonautologous bio bypass of the extremities category
Subordinate codes 5
I70.561 Athscl nonaut bio bypass of the extrm w gangrene, right leg I70.562 Athscl nonaut bio bypass of the extrm w gangrene, left leg I70.563 Athscl nonaut bio bypass of the extrm w gangrene, bi legs I70.568 Athscl nonaut bio bypass of the extrm w gangrene, oth extrm I70.569 Athscl nonaut bio bypass of the extrm w gangrene, unsp extrm
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.