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    v1.0.28
    OpenPayerBilling CodesUrolithiasisICD-10-CM n20-calculus-of-kidney-and-ureter
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    ICD-10-CM Code For Calculus Of Kidney And Ureter: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N20 includes diagnoses for renal and ureteral calculi, specifying stone location and whether obstruction or infection is present. These ICD-10-CM diagnosis codes are used to document clinical encounters involving urinary stone disease, capturing organ involvement, complications such as obstruction or infection, and procedural context when relevant. Accurate coding within the ICD-10-CM N20 group supports proper claim adjudication and complete clinical documentation.

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    ICD-10-CM N20: Calculus Of Kidney And Ureter Overview

    The ICD-10-CM N20 group represents kidney and ureteral calculi, commonly called urinary stones, affecting the renal and urinary tract. These diagnoses target the genitourinary system and include stones in the kidney and ureter with or without obstruction. Accurate coding matters for appropriate claim adjudication and reflects clinical severity and complications that influence reimbursement.

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    When to Use

    Assign a code from this group when a diagnosis of kidney or ureteral stone is documented, including notation of laterality, obstruction, or infection when recorded. Use these codes for encounters addressing acute stone events, follow-up care, and related treatment documentation.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    N20.0Calculus of kidney
    N20.1Calculus of ureter
    N20.2Calculus of kidney with calculus of ureter
    N20.9Urinary calculus, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    693Urinary Stones with MCC
    694Urinary Stones without MCC

    Typical Clinical Scenarios

    • A 34-year-old otherwise healthy woman presents to the emergency department with sudden onset severe right flank pain radiating to the groin, nausea, and gross hematuria. CT scan confirms an obstructing 6 mm calculus located in the proximal right ureter causing hydronephrosis; acute symptomatic urolithiasis is diagnosed and a code from this group is assigned for the calculus causing acute renal colic. Typical codes: N20.1, N20.0
    • A 52-year-old man with recurrent symptomatic kidney stones and a history of prior spontaneous passage presents to the outpatient urology clinic for evaluation and prevention planning; imaging shows multiple nonobstructing renal calculi bilaterally. Because the visit documents chronic or recurrent stones without acute obstruction, a chronic urolithiasis code from this group is assigned to capture ongoing disease management. Typical codes: N20.0, N20.9
    • A 67-year-old woman with acute onset left-sided flank pain and fever is admitted with suspected infected obstructing ureteral stone; imaging reveals a 5 mm stone in the distal left ureter with evidence of hydronephrosis and pyelonephritis. The clinical picture of obstructing calculus complicated by infection leads to assignment of an obstructing ureteral calculus code from this group alongside infection codes. Typical codes: N20.1, N20.2

    Related Codes

    N21-CALCULUS-OF-LOWER-URINARY-TRACT

    ICD-10-CM Code For Calculus Of Lower Urinary Tract: Group Overview

    N22-CALCULUS-OF-URINARY-TRACT

    ICD-10-CM Code For Calculus Of Urinary Tract In Diseases Classified Elsewhere: Group Overview

    N23-UNSPECIFIED-RENAL-COLIC

    ICD-10-CM Code For Unspecified Renal Colic: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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