Urolithiasis (N20-N23)

ICD-10 codes N20 through N23 are used to classify different types of urinary tract stones, including kidney and ureter stones, as well as unspecified kidney pain related to these conditions.

This code range covers specific urinary calculi such as N20.0 for kidney stones, including common forms like calcium oxalate and uric acid stones often referred to as recurrent kidney stones or staghorn calculi. N20.1 captures ureteral stones, sometimes called ureteric stones or ureteral sludge, which can cause urinary tract obstruction. When stones are present in both the kidney and ureter, N20.2 is applied. Lower urinary tract stones, including bladder and urethral stones, fall under N21 codes, with subcategories for bladder calculi (urinary bladder stones) and urethral calculi. Cases where urinary stones are linked to other diseases are coded as N22. Finally, N23 describes unspecified renal colic or kidney pain conditions often synonymous with ureteric colic, helping clinicians document symptomatic presentations without a confirmed stone diagnosis.