ICD-10-CM N21: Calculus of lower urinary tract

ICD-10-CM Diagnosis Code (2025)

Official Description for N21

Calculus of lower urinary tract

Coding Notes & Guidelines for N21

Includes Notes

calculus of lower urinary tract with cystitis and urethritis

Excludes1: Not Coded Here

calculus of urinary tract NOS (N20.9)

Excludes2: Not Included Here

staghorn calculus (N20.0)

Excludes2: Not Included Here

calculus of prostate (N42.0)

Inclusion Terms
  • Calculus in diverticulum of bladder
  • Urinary bladder stone

Child Codes (More Specific Codes for N21):

N21.0 - Calculus in bladder N21.1 - Calculus in urethra N21.8 - Other lower urinary tract calculus N21.9 - Calculus of lower urinary tract, unspecified

About ICD-10-CM Code N21 (Calculus of lower urinary tract)

ICD-10-CM code N21 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM N21 became effective on October 1, 2024.

This page provides detailed information about N21 - Calculus of lower urinary tract. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Calculus of lower urinary tract.