I70.449
Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of unspecified site
I70.449 (also written I70449) is a billable ICD-10-CM diagnosis code for atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of unspecified site. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 246 codes in category I70 (Atherosclerosis). The Alphabetic Index lists it under 2 entries. Its coding notes include a Use additional code instruction and 18 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
- code to identify severity of ulcer (L97.-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 326 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIncludes
Further defines or gives examples of the content of the category.
- arteriolosclerosis
- arterial degeneration
- arteriosclerosis
- arteriosclerotic vascular disease
- arteriovascular degeneration
- atheroma
- endarteritis deformans or obliterans
- senile arteritis
- senile endarteritis
- vascular degeneration
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification), extremities (native arteries), bypass graft, autologous vein graft, leg, left, with, ulceration (and intermittent claudication and rest pain)
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification), with, critical limb ischemia, bypass graft, autologous vein graft, leg, left, with, ulceration (and intermittent claudication and rest pain)