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    v1.0.28
    OpenPayerBilling CodesUrolithiasisICD-10-CM n21-calculus-of-lower-urinary-tract
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    ICD-10-CM Code For Calculus Of Lower Urinary Tract: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N21 includes diagnoses for stones of the lower urinary tract, such as ureteral and bladder calculi, and associated complications like obstruction and infection. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving symptomatic or asymptomatic lower urinary tract stones, capturing disease location, complications, and clinical complexity relevant to this group. Accurate coding within the ICD-10-CM N21 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM N21: Calculus Of Lower Urinary Tract Overview

    This group represents stones (calculi) located in the lower urinary tract, including ureteral and bladder calculi, and the conditions caused by their presence. It targets the genitourinary system and captures presentations such as obstruction, pain, hematuria, and infection related to lower urinary tract stones. Accurate coding is important for complete clinical documentation and for correct reimbursement and claim adjudication.

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    When to Use

    Use a code from this group when a patient is diagnosed with a stone in the ureter or bladder or when clinical documentation indicates complications attributable to a lower urinary tract calculus. Select the code that reflects the exact anatomic site and any documented complications such as obstruction or infection.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    N21.0Calculus in bladder
    N21.1Calculus in urethra
    N21.8Other lower urinary tract calculus
    N21.9Calculus of lower urinary tract, unspecified

    DRG Codes

    2 rows

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

    Typical Clinical Scenarios

    • A 45-year-old man presents to the emergency department with sudden onset severe right flank pain radiating to the groin, nausea, and visible hematuria. Urinalysis shows red blood cells and a non-contrast CT confirms a obstructing calculus located in the distal ureter near the ureterovesical junction; acute pain and obstruction prompt acute management and diagnosis coding for lower urinary tract stone. Typical codes: N21.0, N21.9.
    • A 62-year-old woman with a history of recurrent bladder stones and lower urinary tract symptoms (frequency, dysuria, suprapubic discomfort) is seen in urology clinic for evaluation and planned cystolitholapaxy. Imaging demonstrates multiple small calculi confined to the bladder without acute obstruction; this represents a chronic or recurrent calculi condition of the lower tract and is coded accordingly. Typical codes: N21.1, N21.8.
    • A 70-year-old male with benign prostatic hyperplasia (BPH) develops secondary bladder outlet obstruction and presents with acute urinary retention and infected bladder stones causing fever and positive urine culture. Because the calculi are associated with infection and obstructive complications in the lower urinary tract, an appropriate lower urinary tract calculus diagnosis code is assigned alongside infection and obstructive codes. Typical codes: N21.8, N21.0.

    Related Codes

    N20-CALCULUS-OF-KIDNEY-AND-URETER

    ICD-10-CM Code For Calculus Of Kidney And Ureter: 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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