ICD-10-CM 2027 diagnosis code

N20Calculus of kidney and ureter

Not billable — use a more specific code

N20 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N20

N20 is the ICD-10-CM diagnosis code for calculus of kidney and ureter. It belongs to block N20-N23 (Urolithiasis) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: N20.0 (kidney), N20.1 (ureter), N20.2 (ureter) and N20.9 (unspecified).

Don't report N20 together with the conditions in its Excludes1 note: nephrocalcinosis (E83.59) and that with hydronephrosis (N13.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under N20

Coding notes

Applicable toConditions and synonyms classified to this code

Calculous pyelonephritis

Excludes1Not coded here — never report together with this code

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

Notes that apply from higher levels

Instructions written at a parent level also apply to N20.

Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.

Codes whose notes reference N20

N13Excludes2

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about N20

Is N20 billable?: No. N20 is a header code. Report one of its more specific subcodes instead.