Ischemia and infarction of kidney

This code signifies damage to kidney tissue resulting from insufficient blood supply. This can range from a temporary reduction in blood flow (ischemia) to irreversible tissue death (infarction) within the kidney itself. The underlying cause is typically a blockage or narrowing of the renal arteries or their smaller branches within the kidney.

Assign this code when documentation specifies renal ischemia or infarction, such as acute kidney injury due to renal artery occlusion, or chronic kidney disease stemming from ischemic nephropathy. Supporting documentation includes imaging reports (e.g., renal angiography, CT scan) confirming vascular compromise and pathology reports indicating ischemic changes.

• Differentiate between intrarenal (coded here) and extrarenal (e.g., I70.1) renal artery atherosclerosis.
• Ensure the documentation clearly states ischemia or infarction of the kidney and not just the renal artery.
• Code any underlying conditions causing the ischemia/infarction, such as renal artery embolism (I74.2), as a secondary diagnosis.