I70.34
Atherosclerosis of unspecified type of bypass graft(s) of the left leg with ulceration
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 7 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 19 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.-
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
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
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 7 same parent — I70.3
I70.30 Unsp athscl unsp type bypass graft(s) of the extremities category I70.31 Athscl unsp type bypass of the extremities w intrmt claud category I70.32 Athscl unsp type bypass of the extremities w rest pain category I70.33 Athscl unsp type bypass of the right leg w ulceration category I70.35 Athscl unsp type bypass graft(s) of extremity w ulceration I70.36 Athscl unsp type bypass of the extremities w gangrene category I70.39 Oth athscl unsp type bypass graft(s) of the extremities category
Subordinate codes 7
I70.341 Athscl unsp type bypass of the left leg w ulcer of thigh I70.342 Athscl unsp type bypass of the left leg w ulceration of calf I70.343 Athscl unsp type bypass of the left leg w ulcer of ankle I70.344 Athscl unsp type bypass of left leg w ulc of heel and midft I70.345 Athscl unsp type bypass of the left leg w ulcer oth prt foot I70.348 Athscl unsp type bypass of left leg w ulcer oth prt low leg I70.349 Athscl unsp type bypass of the left leg w ulcer of unsp site
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.