Calculus of lower urinary tract
In Urolithiasis (N20-N23), chapter 14: Diseases of the Genitourinary System
4 billable codes under N21: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- calculus of lower urinary tract with cystitis and urethritis
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 N21
N21 can't be used on a claim. Pick a billable code below; grey headings group them.
N21 MS-DRGs
As the principal diagnosis, all 4 billable codes under N21 group to MS-DRG 693 or 694 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Bladder Diseases
The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are: Doctors diagnose bladder diseases using different tests. These include urine tests, x-rays, and an examination of the bladder wall with a scope called a cystoscope. Treatment depends on the cause of the problem. It may include medicines and, in severe cases, surgery.
Read more about bladder diseases 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 MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.