{"code":"N21","type":"category","title":"Calculus of lower urinary tract","codeAlso":[],"includes":["calculus of lower urinary tract with cystitis and urethritis"],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true},"sibling_codes":["N21.0","N21.1","N21.8","N21.9"],"inclusionTerms":[],"sibling_titles":{"code":"N21.9","title":"Calculus of lower urinary tract, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Calculus of lower urinary tract is a non-billable ICD-10-CM category code (N21). A more specific billable subcode must be selected for claims submission. Includes: calculus of lower urinary tract with cystitis and urethritis.","officialDefinition":"Calculus of lower urinary tract is a non-billable ICD-10-CM category code (N21). A more specific billable subcode must be selected for claims submission. Includes: calculus of lower urinary tract with cystitis and urethritis.","seventhCharacterInstructions":[],"workflowProtocols":[],"guidelines":{"whenToUse":[],"whenNotToUse":[],"commonBillingMistakes":[],"codeComparisons":[],"documentationChecklist":[]},"domainLandscape":{"summary":"Primary diagnostic domain and clinical landscape evaluation.","keyCategories":[],"diagnosticContinuum":"Progression continuum from acute presentation to resolution."},"children":[{"code":"N21.0","title":"Calculus in bladder","description":"Calculus in bladder is a billable ICD-10-CM diagnosis code (N21.0). Includes: calculus of lower urinary tract with cystitis and urethritis. Inclusion terms: Calculus in diverticulum of bladder; Urinary bladder stone. Excludes2 (not included here): staghorn calculus (N20.0).","isBillable":true,"slug":"n21.0-calculus-in-bladder"},{"code":"N21.1","title":"Calculus in urethra","description":"Calculus in urethra is a billable ICD-10-CM diagnosis code (N21.1). Includes: calculus of lower urinary tract with cystitis and urethritis. Excludes2 (not included here): calculus of prostate (N42.0).","isBillable":true,"slug":"n21.1-calculus-in-urethra"},{"code":"N21.8","title":"Other lower urinary tract calculus","description":"Other lower urinary tract calculus is a billable ICD-10-CM diagnosis code (N21.8). Includes: calculus of lower urinary tract with cystitis and urethritis.","isBillable":true,"slug":"n21.8-other-lower-urinary-tract-calculus"},{"code":"N21.9","title":"Calculus of lower urinary tract, unspecified","description":"Calculus of lower urinary tract, unspecified is a billable ICD-10-CM diagnosis code (N21.9). Includes: calculus of lower urinary tract with cystitis and urethritis. Excludes1 (not coded here): calculus of urinary tract NOS (N20.9).","isBillable":true,"slug":"n21.9-calculus-of-lower-urinary-tract-unspecified"}],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":""}