I70.309

HCC Category Mapping

What This Code Means

Plaque buildup in a surgical bypass graft in an extremity (arm or other location) when the specific side cannot be determined or is not documented.

Coding Tips

• •Use this code only when laterality cannot be determined from medical record documentation
• •Query provider if possible to obtain specific extremity location for more precise coding

Clinical Significance

Atherosclerosis of bypass graft(s) without specification of rest pain, ulceration, or gangrene indicates peripheral arterial disease that may present with claudication or be asymptomatic. While less severe than limb-threatening ischemia, this condition requires ongoing monitoring, medical management, and cardiovascular risk factor modification to prevent disease progression. Proper documentation of the specific manifestations helps distinguish this from more severe peripheral arterial disease categories.

Documentation Requirements

• ✓Clinical diagnosis of peripheral atherosclerosis explicitly documented by the provider
• ✓Specification of the affected vessel type (bypass graft(s))
• ✓Laterality clearly documented (unspecified extremity)
• ✓Description of symptoms (claudication, diminished pulses, skin changes) or notation of asymptomatic disease
• ✓Vascular assessment findings such as ankle-brachial index, pulse examination, or imaging
• ✓Current treatment plan including medications, lifestyle modifications, and surveillance schedule
• ✓Documentation of prior bypass graft surgery with type of graft if known (autologous vein, nonnautologous biological, or nonbiological — code to specific graft type when documented)

Commonly Confused Codes