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N11.1

Billable

Chronic obstructive pyelonephritis

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A long-term kidney infection caused by a physical blockage in the urinary tract that prevents normal urine flow and causes repeated infections.

Coding Tips

  • •Document the specific location and nature of the obstruction (stone, stricture, tumor, etc.)
  • •Differentiate from non-obstructive reflux-associated pyelonephritis (N11.0) by confirming anatomical obstruction

Excludes 1 — Do NOT code together

  • calculous pyelonephritis (N20.9)
  • obstructive uropathy (N13.-)

Code Hierarchy

└N11Chronic tubulo-interstitial nephritis└N11.1Chronic obstructive pyelonephritis
└N11.1Chronic obstructive pyelonephritis

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