2020 ICD-10-CM Diagnosis Code N21.1

Calculus in urethra

    2016 2017 2018 2019 2020 Billable/Specific Code
  • N21.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM N21.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N21.1 - other international versions of ICD-10 N21.1 may differ.
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (N21.1) and the excluded code together.
  • calculus of prostate (
    ICD-10-CM Diagnosis Code N42.0

    Calculus of prostate

      2016 2017 2018 2019 2020 Billable/Specific Code Adult Dx (15-124 years) Male Dx
    Applicable To
    • Prostatic stone
    N42.0
    )
The following code(s) above N21.1 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 N21.1:
  • N00-N99
    2020 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 2020 Non-Billable/Non-Specific Code
    Includes
    • calculus of lower urinary tract with cystitis and urethritis
    Calculus of lower urinary tract
Approximate Synonyms
  • Calculus, urethra
ICD-10-CM N21.1 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 693 Urinary stones with mcc
  • 694 Urinary stones without mcc

Convert N21.1 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

Diagnosis Index entries containing back-references to N21.1:
  • Calculus, calculi, calculous
    • urethra N21.1 (impacted)
  • Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) R10.83
    ICD-10-CM Diagnosis Code R10.83

    Colic

      2016 2017 2018 2019 2020 Billable/Specific Code Pediatric Dx (0-17 years)
    Applicable To
    • Colic NOS
    • Infantile colic
    Type 1 Excludes
    • colic in adult and child over 12 months old (R10.84)
    • urethral N36.8
      ICD-10-CM Diagnosis Code N36.8

      Other specified disorders of urethra

        2016 2017 2018 2019 2020 Billable/Specific Code
      Type 1 Excludes
      • congenital urethrocele (Q64.7)
      • female urethrocele (N81.0)
      • due to calculus N21.1
  • Stone(s) - see also Calculus
    • urethra N21.1 (impacted)
  • Urethritis (anterior) (posterior) N34.2
    ICD-10-CM Diagnosis Code N34.2

    Other urethritis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Meatitis, urethral
    • Postmenopausal urethritis
    • Ulcer of urethra (meatus)
    • Urethritis NOS
    • calculous N21.1
  • Urethrolithiasis N21.1 (with colic or infection)

ICD-10-CM Codes Adjacent To N21.1
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
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

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