2027 ICD-10-CM Diagnosis Code N20Calculus of kidney and ureter

ICD-10-CM Codes›N00–N99›N20-N23›N20

ICD-10-CM N20
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N20 is a non-billable ICD-10-CM category code for calculus of kidney and ureter, so it cannot be submitted on claims. Use a more specific code from this category instead, such as N20.0, N20.1, N20.2, and N20.9.

Code Identity

ICD-10-CM Code
N20
Billable Status
No — Non-Billable Category
Code Describes
Calculus of kidney and ureter
Short Description
Calculus of kidney and ureter
Same as the full description in the CMS dataset.
Chapter
N20-N23
Urolithiasis

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN20-N23Urolithiasis
CategoryN20Calculus of kidney and ureter
This CodeN20Calculus of kidney and ureter

Specific Coding for Calculus of kidney and ureterOverview

Non-specific codes like N20 require more characters. Use one of these billable codes instead:

  • Use N20.0 for Calculus of kidney

  • Use N20.1 for Calculus of ureter

  • Use N20.2 for Calculus of kidney with calculus of ureter

  • Use N20.9 for Urinary calculus, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N20: its own notes plus those printed at Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Calculous pyelonephritis

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • nephrocalcinosis (E83.59)
  • that with hydronephrosis (N13.2)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N20, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming N20: its condition is not part of those codes, and both may be reported when the patient has both.

  • N13 Obstructive and reflux uropathy
    calculus of kidney and ureter without hydronephrosis (N20.-)
  • Block N25-N29 Other disorders of kidney and ureter
    disorders of kidney and ureter with urolithiasis (N20-N23)

Patient EducationClinical

Kidney Stones

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N20Overview

What is the ICD-10 code for calculus of kidney and ureter?

N20 is the ICD-10-CM category for calculus of kidney and ureter, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is N20 (Calculus of kidney and ureter) a billable code?

No. This is a category header that groups the codes for calculus of kidney and ureter, and headers cannot be submitted on claims. Claims for calculus of kidney and ureter need a more specific code from this category, such as N20.0, N20.1, and N20.2.

Can N20 be reported with E83.59?

Not as a rule. The Excludes1 note on N20 lists "nephrocalcinosis (E83.59)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).