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ICD-10/N18.1

N18.1 ICD-10-CM Code: Chronic kidney disease, stage 1

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 008 — SIMULTANEOUS PANCREAS AND KIDNEY TRANSPLANT (MDC PRE)
  • MS-DRG 019 — SIMULTANEOUS PANCREAS AND KIDNEY TRANSPLANT WITH HEMODIALYSIS (MDC PRE)
  • MS-DRG 682 — RENAL FAILURE WITH MCC (MDC 11)
  • MS-DRG 683 — RENAL FAILURE WITH CC (MDC 11)
  • MS-DRG 684 — RENAL FAILURE WITHOUT CC/MCC (MDC 11)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Chronic kidney disease, stage 1 is a billable ICD-10-CM diagnosis code (N18.1).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for N18.1 in the official ICD-10-CM tabular list.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • 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)

Code First

Underlying conditions that must be sequenced before this code.

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

Use Additional Code

Supplementary codes the tabular list directs you to add.

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N18.1 in its code family, with their registry titles.

  • N18 — Chronic kidney disease (CKD)
  • N18.2 — Chronic kidney disease, stage 2 (mild)
  • N18.3 — Chronic kidney disease, stage 3 (moderate)
  • N18.30 — Chronic kidney disease, stage 3 unspecified
  • N18.31 — Chronic kidney disease, stage 3a
  • N18.32 — Chronic kidney disease, stage 3b
  • N18.4 — Chronic kidney disease, stage 4 (severe)
  • N18.5 — Chronic kidney disease, stage 5
  • N18.6 — End stage renal disease
  • N18.9 — Chronic kidney disease, unspecified

View all codes in the N18 family

Indexed Clinical Terms (1)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Disease, diseased, kidney (functional) (pelvis), chronic, stage 1