2019 ICD-10-CM Diagnosis Code N21.9

Calculus of lower urinary tract, unspecified

    2016 2017 2018 2019 Billable/Specific Code
  • N21.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM N21.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of N21.9 - other international versions of ICD-10 N21.9 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as N21.9. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • calculus of urinary tract NOS (
    ICD-10-CM Diagnosis Code N20.9

    Urinary calculus, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    N20.9
    )
The following code(s) above N21.9 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 N21.9:
  • N00-N99
    2019 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
  • N21
    ICD-10-CM Diagnosis Code N21

    Calculus of lower urinary tract

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Includes
    • calculus of lower urinary tract with cystitis and urethritis
    Calculus of lower urinary tract
Approximate Synonyms
  • Calculus of lower urinary tract
  • Calculus, lower urinary tract
ICD-10-CM N21.9 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 691 Urinary stones with esw lithotripsy with cc/mcc
  • 692 Urinary stones with esw lithotripsy without cc/mcc
  • 693 Urinary stones without esw lithotripsy with mcc
  • 694 Urinary stones without esw lithotripsy without mcc

Convert N21.9 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

Diagnosis Index entries containing back-references to N21.9:
  • Calculus, calculi, calculous
    • urinary (duct) (impacted) (passage) (tract) N20.9
      ICD-10-CM Diagnosis Code N20.9

      Urinary calculus, unspecified

        2016 2017 2018 2019 Billable/Specific Code
  • Stone(s) - see also Calculus
    • urinary (duct) (impacted) (passage) N20.9
      ICD-10-CM Diagnosis Code N20.9

      Urinary calculus, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      • lower tract N21.9

ICD-10-CM Codes Adjacent To N21.9
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
N25 Disorders resulting from impaired renal tubular function
N25.0 Renal osteodystrophy
N25.1 Nephrogenic diabetes insipidus
N25.8 Other disorders resulting from impaired renal tubular function
N25.81 Secondary hyperparathyroidism of renal origin
N25.89 Other disorders resulting from impaired renal tubular function
N25.9 Disorder resulting from impaired renal tubular function, unspecified
N26 Unspecified contracted kidney

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