I70.363 Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, bilateral legs

The ICD-10-CM code for Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, bilateral legs is I70.363 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

9: Diseases of the circulatory system (I00-I99)

Section

I70-I79: Diseases of arteries, arterioles and capillaries (I70-I79)

Category I70

296 codes (246 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to I70.363:

• Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › extremities (native arteries) › bypass graft › leg › bilateral › with › gangrene (and intermittent claudication, rest pain and ulcer)
• Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › with › critical limb ischemia › bypass graft › leg › bilateral › with › gangrene (and intermittent claudication, rest pain, and ulcer)

U.S. Hospital Utilization

I70.363 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Presumed relationship due to Index term “with”

The classification presumes a causal relationship between hypertension and heart involvement and between hypertension and kidney involvement, as the two conditions are linked by the term “with” in the Alphabetic Index. These conditions should be coded as related even in the absence of provider documentation explicitly linking them, unless the documentation clearly states the conditions are unrelated.

Provider must link conditions not specifically indexed as related

For hypertension and conditions not specifically linked by relational terms such as “with,” “associated with” or “due to” in the classification, provider documentation must link the conditions in order to code them as related.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

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I70.363 — Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, bilateral legs. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/I70.363

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