I70.763

HCC Category Mapping

What This Code Means

Hardening and narrowing of a surgical bypass graft affecting both legs with tissue death (gangrene) in both extremities due to blocked blood flow.

Coding Tips

• •Confirm documentation explicitly states bilateral involvement and gangrene in both legs
• •This bilateral presentation indicates severe systemic atherosclerotic disease and typically requires immediate vascular intervention

Clinical Significance

Atherosclerosis of other type bypass graft with gangrene of the bilateral legs represents the most severe stage of peripheral arterial disease (Fontaine Stage IV with tissue necrosis). Gangrene indicates irreversible tissue death from critical ischemia, carrying high risk for major amputation, sepsis, and mortality. This is a high-acuity condition requiring urgent vascular intervention, aggressive wound management, and often surgical amputation, making it one of the most impactful vascular HCC codes for risk adjustment.

Documentation Requirements

• ✓Gangrene explicitly documented in the bilateral legs — wet or dry gangrene specified when possible
• ✓Atherosclerotic disease of other type bypass graft(s) confirmed as the underlying cause
• ✓Laterality documented: bilateral legs
• ✓Type of bypass graft specified (synthetic, composite, or other non-vein/non-biological type)
• ✓Extent of gangrenous tissue described (digits, forefoot, limb segment)
• ✓Additional code(s) to identify severity of any associated ulceration (L97.-, L98.49-) when ulcers coexist
• ✓Treatment plan documented (amputation level, revascularization attempts, wound care, antibiotic therapy)
• ✓Vascular studies or surgical findings supporting the diagnosis

Commonly Confused Codes