N12 — Tubulo-interstitial nephritis, not specified as acute or chronic

N12

ICD-10 Chapter 14: Genitourinary System — illustrative image — Chapter 14: Diseases of the genitourinary system (N00–N99) — illustrative image

What this code means

Tubulo-interstitial nephritis is inflammation of the kidney's tubules and surrounding tissue, recorded without stating whether it is acute or chronic.

Also called: tubulo-interstitial nephritis, interstitial nephritis.

When this code is used

Used for tubulo-interstitial nephritis, not specified as acute or chronic.

Where it sits in ICD-10-CM

Code N12 belongs to Chapter 14: Diseases of the genitourinary system, which covers codes N00–N99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related anatomy

Kidneys

Frequently asked questions

What is ICD-10-CM code N12?

N12 is the ICD-10-CM diagnosis code for “Tubulo-interstitial nephritis, not specified as acute or chronic”. Tubulo-interstitial nephritis is inflammation of the kidney's tubules and surrounding tissue, recorded without stating whether it is acute or chronic.

When is code N12 used?

Used for tubulo-interstitial nephritis, not specified as acute or chronic. It belongs to Chapter 14 of ICD-10-CM (Diseases of the genitourinary system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.