Section N20-N23Urolithiasis
  1. N20 Calculus of kidney and ureter

    Inclusion term(s):

    • Calculous pyelonephritis

    Excludes1

    • nephrocalcinosis (E83.59)
    • that with hydronephrosis (N13.2)
    1. N20.0 Calculus of kidney

      Inclusion term(s):

      • Nephrolithiasis NOS
      • Renal calculus
      • Renal stone
      • Staghorn calculus
      • Stone in kidney
    2. N20.1 Calculus of ureter

      Inclusion term(s):

      • Calculus of the ureteropelvic junction
      • Ureteric stone
    3. N20.2 Calculus of kidney with calculus of ureter

    4. N20.9 Urinary calculus, unspecified

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.