ICD-10/N15.9

N15.9 ICD 2026 Code: Renal tubulo-interstitial disease, unspecified

N15.9 is the authoritative medical code for Renal tubulo-interstitial disease, unspecified. This classification is used in medical billing and clinical recording to specify the clinical criteria for renal tubulo-interstitial disease, unspecified (ICD-10-CM N15.9), ensuring healthcare documentation aligns with 2026 federal coding standards.

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

Official Registry Overview & Definition

Renal tubulo-interstitial disease, unspecified is a billable ICD-10-CM diagnosis code N15.9. Includes: pyelonephritis. Inclusion terms: Infection of kidney NOS. Excludes1 (not coded here): urinary tract infection NOS N39.0; pyeloureteritis cystica N28.85.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for N15.9 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • pyelonephritis

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Infection of kidney NOS

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • urinary tract infection NOS N39.0
  • pyeloureteritis cystica N28.85

Frequently Asked Questions (FAQ) & Clinical Guidance

What can't be coded together with N15.9?

Per Excludes1 instructions, N15.9 must not be reported with: urinary tract infection NOS (N39.0); pyeloureteritis cystica (N28.85).

What conditions are included under N15.9?

Renal tubulo-interstitial disease, unspecified includes: Infection of kidney NOS.

Codes in This Family (4)

Official ICD-10-CM classifications in the same code family as N15.9, with their registry titles.

  • N15 — Other renal tubulo-interstitial diseases
  • N15.0 — Balkan nephropathy
  • N15.1 — Renal and perinephric abscess
  • N15.8 — Other specified renal tubulo-interstitial diseases

Indexed Clinical Terms (2)

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

  • Disease, diseased, tubulo-interstitial
  • Infection, infected, infective (opportunistic), kidney (cortex) (hematogenous)

Related Codes & Numerical Sequence (Crawl Map)

Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:

ICD Code N11.9 Chronic tubulo-interstitial nephritis, unspecified
ICD Code N13.9 Obstructive and reflux uropathy, unspecified
ICD Code N17.9 Acute kidney failure, unspecified
ICD Code N18.9 Chronic kidney disease, unspecified
ICD Code N20.9 Urinary calculus, unspecified
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