ICD-10-CM 2027
ICD-10 code for kidney disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › kidney (functional) (pelvis)”. Page updated September 29, 2026.
About coding kidney disease
The ICD-10-CM code for kidney disease is N28.9 (Disorder of kidney and ureter, unspecified). The official index lists 16 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N28.9.
Within N28, choose N28.9 (Disorder of kidney and ureter, unspecified) only when documentation doesn't support a more specific option: ischemia and infarction of kidney (N28.0), cyst of kidney, acquired (N28.1) and other specified disorders of kidney and ureter (N28.8).
Don't report N28.9 together with the conditions in its Excludes1 note: chronic renal insufficiency (N18.9) and unspecified nephritic syndrome (N05.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific kidney disease codes (official index)
- chronic N18.9 — Chronic kidney disease, unspecified
- hypertensive
- stage 1 N18.1 — Chronic kidney disease, stage 1
- stage 2 (mild) N18.2 — Chronic kidney disease, stage 2 (mild)
- stage 3 (moderate) N18.30 — Chronic kidney disease, stage 3 unspecified
- stage 3a N18.31 — Chronic kidney disease, stage 3a
- stage 3b N18.32 — Chronic kidney disease, stage 3b
- stage 4 (severe) N18.4 — Chronic kidney disease, stage 4 (severe)
- stage 5 N18.5 — Chronic kidney disease, stage 5
- complicating pregnancy
- cystic (congenital) Q61.9 — Cystic kidney disease, unspecified
- diabetic
- fibrocystic (congenital) Q61.8 — Other cystic kidney diseases
- hypertensive
- in (due to)
- schistosomiasis (bilharziasis) B65.9 — Schistosomiasis, unspecified
- multicystic Q61.4 — Renal dysplasia
- polycystic Q61.3 — Polycystic kidney, unspecified
- adult type Q61.2 — Polycystic kidney, adult type
- childhood type NEC Q61.19 — Other polycystic kidney, infantile type
- collecting duct dilatation Q61.11 — Cystic dilatation of collecting ducts
Don't confuse with (Excludes1 for N28.9)
Common questions about kidney disease ICD-10 codes
What is the ICD-10 code for kidney disease?
- N28.9 — Disorder of kidney and ureter, unspecified. More specific codes apply when the documentation supports them: N18.9, N18.1, N18.2, N18.30 and others below.
What is the ICD-10 code for chronic kidney disease?
- N18.9 — Chronic kidney disease, unspecified.
What is the ICD-10 code for cystic kidney disease?
- Q61.9 — Cystic kidney disease, unspecified.
What is the ICD-10 code for fibrocystic kidney disease?
- Q61.8 — Other cystic kidney diseases.
What is the ICD-10 code for multicystic kidney disease?
- Q61.4 — Renal dysplasia.
What is the ICD-10 code for polycystic kidney disease?
- Q61.3 — Polycystic kidney, unspecified.
Is N28.9 billable?
- Yes. N28.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N28.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N28.9 as a principal diagnosis.
Is N28.9 a CC or MCC?
- No. N28.9 is neither a CC nor an MCC under MS-DRG v44.0.