Alphabetic Index FY2027

N18

Chronic kidney disease (CKD)

FY2027Chapter 14: Diseases of the genitourinary system/N17–N19 Acute kidney failure and chronic kidney disease

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

N18 is a non-billable ICD-10-CM code category for chronic kidney disease (CKD). Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are N18.1 Chronic kidney disease, stage 1; N18.2 Chronic kidney disease, stage 2 (mild); N18.3 Chronic kidney disease, stage 3 (moderate); N18.4 Chronic kidney disease, stage 4 (severe) and 3 more. Its coding notes include a Code first instruction, a Use additional code instruction and 19 Excludes2 entries.

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Hypertension with heart disease and CKD goes to I13, not I11 or I12. An N18 code is added as a secondary code to give the CKD stage.

Guidelines I.C.9.a.2; I.C.9.a.3Hypertensive heart disease and chronic kidney diseaseRead the official text

ESRD is assigned only when the provider documents it. If a CKD stage and ESRD are both documented, only N18.6 is assigned.

Guidelines I.C.14.a.1Chronic kidney disease stages and ESRDRead the official text

Code first

If the underlying condition listed here is present and known, sequence it first.

This code

Use additional code

Add the listed code as a secondary code, if known.

This code
  • code, if applicable, to identify:
    • associated cachexia (E88.A)
    • kidney transplant status (Z94.0)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (19 notes)
Inherited from N17–N19 Acute kidney failure and chronic kidney disease
  • congenital renal failure (P96.0)
  • drug- and heavy-metal-induced tubulo-interstitial and tubular conditions (N14.-)
  • extrarenal uremia (R39.2)
  • hemolytic-uremic syndrome (D59.3-)
  • hepatorenal syndrome (K76.7)
  • postpartum hepatorenal syndrome (O90.41)
  • posttraumatic renal failure (T79.5)
  • prerenal uremia (R39.2)
  • renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)
  • renal failure following labor and delivery (O90.41)
  • renal failure postprocedural (N99.0)
Inherited from Chapter 14 Diseases of the genitourinary system
  • 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)

More specific codes under N18 7