Section N20-N23Urolithiasis
  1. N21 Calculus of lower urinary tract

    Includes:

    • calculus of lower urinary tract with cystitis and urethritis
    1. N21.0 Calculus in bladder

      Inclusion term(s):

      • Calculus in diverticulum of bladder
      • Urinary bladder stone
    2. N21.1 Calculus in urethra

    3. N21.8 Other lower urinary tract calculus

    4. N21.9 Calculus of lower urinary tract, 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.