Urolithiasis (N20-N23)
chapter 14: Diseases of the Genitourinary System
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers chronic kidney disease staging, CKD in kidney transplant patients, and sequencing CKD with related conditions such as diabetes and hypertension.
- Chronic kidney disease (page 62)
All codes under N20-N23
N20-N23 can't be used on a claim. Pick a billable code below; grey headings group them.
- N20Calculus of kidney and ureter
- N20.0Calculus of kidney
- N20.1Calculus of ureter
- N20.2Calculus of kidney with calculus of ureter
- N20.9Urinary calculus, unspecified
- N21Calculus of lower urinary tract
- N21.0Calculus in bladder
- N21.1Calculus in urethra
- N21.8Other lower urinary tract calculus
- N21.9Calculus of lower urinary tract, unspecified
- N22Calculus of urinary tract in diseases classified elsewhere
- N23Unspecified renal colic
N20-N23 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to N20-N23
Notes on these codes point to N20-N23.
- N25-N29 Excludes2: disorders of kidney and ureter with urolithiasis (N20-N23)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Kidney Stones
A kidney stone is a solid piece of material that forms in the kidney from substances in the urine. It may be as small as a grain of sand or as large as a pearl. Most kidney stones pass out of the body without help from a doctor. But sometimes a stone will not go away. It may get stuck in the urinary tract, block the flow of urine and cause great pain.
Read more about kidney stones on MedlinePlusUreteral Disorders
Your kidneys make urine by filtering wastes and extra water from your blood. The urine travels from the kidneys to the bladder in two thin tubes called ureters.
Read more about ureteral disorders on MedlinePlus