I70.638
Atherosclerosis of nonbiological bypass graft(s) of the right leg with ulceration of other part of lower leg
I70.638 (also written I70638) is a billable ICD-10-CM diagnosis code for atherosclerosis of nonbiological bypass graft(s) of the right leg with ulceration of other part of lower leg. 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.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Wound clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital 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, nonbiological graft, leg, right, with, ulceration (and intermittent claudication and rest pain), lower leg NEC
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification), with, critical limb ischemia, bypass graft, nonbiological graft, leg, right, with, ulceration (and intermittent claudication and rest pain), lower leg NEC