I70.669

Billable

Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, unspecified extremity

HCC Category Mapping

V28HCC 263 — Atherosclerosis of the Extremities with Ulceration or Gangrene

0.742

V24HCC 106 — Atherosclerosis of the Extremities with Ulceration or Gangrene

0.860

ESRDHCC 106 — Atherosclerosis of the Extremities with Ulceration or Gangrene

0.000

What This Code Means

This code describes a serious condition where an artificial bypass graft (a surgically placed tube used to reroute blood flow around a blocked artery) has developed fatty buildup and is causing tissue death (gangrene) in a limb, but the specific limb affected is not documented. Gangrene is a life-threatening condition requiring urgent medical intervention.

Coding Tips

•This code requires documentation of which extremity is affected (right/left leg or arm); if unspecified in the medical record, query the provider for clarification to assign the most specific code
•Verify the type of bypass graft material in the documentation; if it is a biological graft (vein or artery), use a different code category (I70.6) rather than nonbiological (I70.66)

Clinical Significance

This code captures atherosclerosis affecting nonbiological (synthetic) bypass graft(s) of the extremities complicated by gangrene in the unspecified extremity, representing the most severe stage of peripheral arterial disease (Fontaine Stage IV/Rutherford Category 5-6). Gangrene in bypass graft atherosclerosis indicates critical limb ischemia with tissue death, carrying high risk for amputation, sepsis, and mortality. This diagnosis significantly impacts risk adjustment due to the intensive surgical, wound care, and vascular management required.

Documentation Requirements

✓Confirmed diagnosis of atherosclerosis affecting nonbiological (synthetic) bypass graft(s)
✓Type of bypass graft material documented (synthetic/nonbiological vs. other type such as composite or mixed-material graft)
✓Laterality clearly documented (unspecified extremity)
✓History of bypass graft surgery with approximate date or timeframe
✓Current status and monitoring plan for the bypass graft
✓Documentation of gangrene: location, extent, wet vs. dry, and tissue involvement
✓Vascular studies (ankle-brachial index, duplex ultrasound, or angiography) confirming critical ischemia
✓Wound care plan and surgical consultation documentation
✓Assessment of amputation risk and level if applicable

Commonly Confused Codes

I70.561-I70.569 — Atherosclerosis of nonautologous biological bypass graft with gangrene; different graft material (cadaveric vein, bovine)I70.461-I70.469 — Atherosclerosis of autologous vein bypass graft with gangrene; for patient's own vein graft (e.g., saphenous vein)I70.361-I70.369 — Atherosclerosis of unspecified bypass graft with gangrene; use only when graft type is unknown I70.261-I70.269 — Atherosclerosis of native arteries with gangrene; for disease in native vessels, not grafts I70.761-I70.769 — Atherosclerosis of other type of bypass graft with gangrene; for composite or other non-standard graft materials I96 — Gangrene, not elsewhere classified; do not use when the gangrene is specified as atherosclerotic