ICD-10-CM 2027 diagnosis code
N26Unspecified contracted kidney
N26 is a header code, so it can't be reported by itself. Choose one of the 3 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 N26
N26 is the ICD-10-CM diagnosis code for unspecified contracted kidney. It belongs to block N25-N29 (other disorders of kidney and ureter) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: N26.1 ((terminal)), N26.2 (kidney) and N26.9 (unspecified).
Don't report N26 together with the conditions in its Excludes1 note: contracted kidney due to hypertension (I12.-), diffuse sclerosing glomerulonephritis (N05.8.-), hypertensive nephrosclerosis (arteriolar) (arteriosclerotic) (I12.-) and small kidney of unknown cause (N27.-).
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 N26
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to N26.
Broader instructions also apply from N25-N29 Other disorders of kidney and ureter and Chapter 14: Diseases of the genitourinary system.
Codes whose notes reference N26
- I12Includes
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 N26
Is N26 billable?
- No. N26 is a header code. Report one of its more specific subcodes instead.