ICD-10 Code N21.8

Other lower urinary tract calculus

Version 2019 Billable Code
ICD-10:N21.8
Short Description:Other lower urinary tract calculus
Long Description:Other lower urinary tract calculus

Valid for Submission

ICD-10 N21.8 is a billable code used to specify a medical diagnosis of other lower urinary tract calculus. The code is valid for the year 2019 for the submission of HIPAA-covered transactions.

Code Classification

  • Diseases of the genitourinary system (N00–N99)
    • Urolithiasis (N20-N23)
      • Calculus of lower urinary tract (N21)

Information for Medical Professionals

Diagnostic Related Groups

The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC). The diagnosis code N21.8 is grouped in the following groups for version MS-DRG V36.0 applicable from 10/01/2018 through 09/30/2019.

  • 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 N21.8 to ICD-9

The following crosswalk between ICD-10 to ICD-9 is based based on the General Equivalence Mappings (GEMS) information:

  • 594.8 - Lower urin calcul NEC

Synonyms

The following clinical terms are approximate synonyms:

  • Ureteric stone
  • Urinary bladder stone
  • Vesicoureteric junction calculus

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code N21.8 are found in the index:


Information for Patients


Bladder Diseases

The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are

  • Cystitis - inflammation of the bladder, often from an infection
  • Urinary incontinence - loss of bladder control
  • Overactive bladder - a condition in which the bladder squeezes urine out at the wrong time
  • Interstitial cystitis - a chronic problem that causes bladder pain and frequent, urgent urination
  • Bladder cancer

Doctors diagnose bladder diseases using different tests. These include urine tests, x-rays, and an examination of the bladder wall with a scope called a cystoscope. Treatment depends on the cause of the problem. It may include medicines and, in severe cases, surgery.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Bladder biopsy (Medical Encyclopedia)
  • Bladder outlet obstruction (Medical Encyclopedia)
  • Bladder stones (Medical Encyclopedia)
  • Cystitis - noninfectious (Medical Encyclopedia)
  • Indwelling catheter care (Medical Encyclopedia)
  • Neurogenic bladder (Medical Encyclopedia)
  • Self catheterization - female (Medical Encyclopedia)
  • Self catheterization - male (Medical Encyclopedia)
  • Urinary catheters (Medical Encyclopedia)
  • Urinary Retention - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)

[Read More]

Ureteral Disorders

Your kidneys make urine by filtering wastes and extra water from your blood. The urine travels from the kidneys to the bladder in two thin tubes called ureters.

The ureters are about 8 to 10 inches long. Muscles in the ureter walls tighten and relax to force urine down and away from the kidneys. Small amounts of urine flow from the ureters into the bladder about every 10 to 15 seconds.

Sometimes the ureters can become blocked or injured. This can block the flow of urine to the bladder. If urine stands still or backs up the ureter, you may get a urinary tract infections.

Doctors diagnose problems with the ureters using different tests. These include urine tests, x-rays, and examination of the ureter with a scope called a cystoscope. Treatment depends on the cause of the problem. It may include medicines and, in severe cases, surgery.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Injury - kidney and ureter (Medical Encyclopedia)
  • Retroperitoneal fibrosis (Medical Encyclopedia)
  • Ureteral reimplantation surgery - children (Medical Encyclopedia)
  • Ureteral retrograde brush biopsy (Medical Encyclopedia)
  • Ureterocele (Medical Encyclopedia)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.