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ICD-10-CM 2027 diagnosis code

N18Chronic kidney disease (CKD)

Not billable — use a more specific code

N18 is a header code, so it can't be reported by itself. Choose one of the 7 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 N18

N18 is the ICD-10-CM diagnosis code for chronic kidney disease (CKD). It belongs to block N17-N19 (acute kidney failure and chronic kidney disease) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: N18.1 (1), N18.2 ((mild)), N18.3 ((moderate)), N18.4 ((severe)), N18.5 (5), N18.6 (disease) and N18.9 (unspecified).

Code first any associated: diabetic chronic kidney disease (E08.22, E09.22, E10.22, E11.22, E13.22) and hypertensive chronic kidney disease (I12.-, I13.-).

Use an additional code, if applicable, to identify: associated cachexia (E88.A) and kidney transplant status (Z94.0).

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 N18

Coding notes

Code firstSequence the underlying condition first
Use additional codeAdd a secondary code to fully describe the condition
  • code, if applicable, to identify:
  • associated cachexia (E88.A)
  • kidney transplant status (Z94.0)

Notes that apply from higher levels

Instructions written at a parent level also apply to N18.

Broader instructions also apply from N17-N19 Acute kidney failure and chronic kidney disease and Chapter 14: Diseases of the genitourinary system.

Codes whose notes reference N18

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about N18

Is N18 billable?

No. N18 is a header code. Report one of its more specific subcodes instead.