I70.449

HCC Category Mapping

What This Code Means

This code describes a condition where fatty deposits have built up in a vein graft that was surgically placed in the left leg to bypass a blocked artery, and this buildup has caused an open sore or ulcer to develop on the leg. The specific location of the ulcer is not documented in the medical record.

Coding Tips

• •Verify documentation specifies the graft is autologous (patient's own vein) rather than synthetic or allograft material, as this affects code selection
• •Confirm the ulcer location is truly unspecified; if documentation identifies the site (heel, toe, calf, etc.), use a more specific code with the documented location

Clinical Significance

This code identifies atherosclerosis in autologous vein bypass grafts with ulceration of unspecified site, indicating significant peripheral arterial insufficiency causing tissue breakdown. Ulceration complicating bypass graft atherosclerosis signals graft stenosis or failure with inadequate distal perfusion, requiring wound care management and potential revascularization. Accurate capture matters for risk adjustment as it reflects the progression from stable peripheral arterial disease to limb-threatening ischemia.

Documentation Requirements

• ✓Documentation of peripheral arterial disease or atherosclerosis affecting the bypass graft
• ✓Identification of graft type as autologous vein (if autologous vein is confirmed, document the vein source; if type is unknown, document it as unspecified)
• ✓Laterality clearly stated as left leg
• ✓Ulcer site specifically documented (in this case, unspecified site)
• ✓Ulcer severity, size, and depth documented (consider Wound, Ischemia, and foot Infection classification or similar staging)
• ✓Causal link between atherosclerotic graft disease and the ulceration must be established in the documentation
• ✓Current wound care plan and treatment documented
• ✓History of bypass graft surgery with date and indication when available

Commonly Confused Codes