2021 ICD-10-CM Diagnosis Code N20.0

Calculus of kidney

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • N20.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM N20.0 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of N20.0 - other international versions of ICD-10 N20.0 may differ.
Applicable To
  • Nephrolithiasis NOS
  • Renal calculus
  • Renal stone
  • Staghorn calculus
  • Stone in kidney
The following code(s) above N20.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to N20.0:
  • N00-N99
    2021 ICD-10-CM Range N00-N99

    Diseases of the genitourinary system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the genitourinary system
  • N20
    ICD-10-CM Diagnosis Code N20

    Calculus of kidney and ureter

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Calculous pyelonephritis
    Type 1 Excludes
    • nephrocalcinosis (E83.5)
    • that with hydronephrosis (N13.2)
    Calculus of kidney and ureter
Approximate Synonyms
  • Calculus of kidney (kidney stone)
  • Kidney stone
  • Staghorn calculus
  • Staghorn calculus (kidney stone)
  • Uric acid nephrolithiasis
  • Uric acid renal calculus
Clinical Information
  • A disorder characterized by the formation of crystals in the pelvis of the kidney.
  • 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. The following may be signs of kidney stones that need a doctor's help:
    • extreme pain in your back or side that will not go away
    • blood in your urine
    • fever and chills
    • vomiting
    • urine that smells bad or looks cloudy
    • a burning feeling when you urinate
  • Condition marked by the presence of renal calculi, abnormal concretions within the kidney, usually of mineral salts.
  • Crystals in the pelvis of the kidney.
  • Formation of stones in the kidney.
  • Stones in the kidney, usually formed in the urine-collecting area of the kidney (kidney pelvis). Their sizes vary and most contains calcium oxalate.
ICD-10-CM N20.0 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 693 Urinary stones with mcc
  • 694 Urinary stones without mcc

Convert N20.0 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to N20.0:
  • Type 1 Excludes: E79
    ICD-10-CM Diagnosis Code E79

    Disorders of purine and pyrimidine metabolism

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
  • Type 2 Excludes: N21.0
    ICD-10-CM Diagnosis Code N21.0

    Calculus in bladder

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Calculus in diverticulum of bladder
    • Urinary bladder stone
    Type 2 Excludes
    • staghorn calculus (N20.0)

Diagnosis Index entries containing back-references to N20.0:
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
    ICD-10-CM Diagnosis Code L02.91

    Cutaneous abscess, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    • kidney N15.1
      ICD-10-CM Diagnosis Code N15.1

      Renal and perinephric abscess

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • Calculus, calculi, calculous
    • diverticulum
      • kidney N20.0
    • kidney (impacted) (multiple) (pelvis) (recurrent) (staghorn) N20.0
    • pyelitis (impacted) (recurrent) N20.0
  • Infection, infected, infective (opportunistic) B99.9
    ICD-10-CM Diagnosis Code B99.9

    Unspecified infectious disease

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    • kidney (cortex) (hematogenous) N15.9
      ICD-10-CM Diagnosis Code N15.9

      Renal tubulo-interstitial disease, unspecified

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      Applicable To
      • Infection of kidney NOS
      Type 1 Excludes
      • urinary tract infection NOS (N39.0)
  • Stone(s) - see also Calculus
    • kidney N20.0
    • renal N20.0

ICD-10-CM Codes Adjacent To N20.0
N18.3 Chronic kidney disease, stage 3 (moderate)
N18.30 Chronic kidney disease, stage 3 unspecified
N18.31 Chronic kidney disease, stage 3a
N18.32 Chronic kidney disease, stage 3b
N18.4 Chronic kidney disease, stage 4 (severe)
N18.5 Chronic kidney disease, stage 5
N18.6 End stage renal disease
N18.9 Chronic kidney disease, unspecified
N19 Unspecified kidney failure
N20 Calculus of kidney and ureter
N20.0 Calculus of kidney
N20.1 Calculus of ureter
N20.2 Calculus of kidney with calculus of ureter
N20.9 Urinary calculus, unspecified
N21 Calculus of lower urinary tract
N21.0 Calculus in bladder
N21.1 Calculus in urethra
N21.8 Other lower urinary tract calculus
N21.9 Calculus of lower urinary tract, unspecified
N22 Calculus of urinary tract in diseases classified elsewhere
N23 Unspecified renal colic

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.