U.S. ICD-10-CM · FY 2027

N12 ICD-10-CM Code: Tubulo-interstitial nephritis, not specified as acute or chronic

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

N12

Tubulo-interstitial nephritis, not specified as acute or chronic

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where N12 sits

  1. 1

    Chapter 14

    Diseases of the genitourinary system (N00-N99)

  2. 2

    Section

    Renal tubulo-interstitial diseases (N10-N16)

  3. 3

    Category N12

    Tubulo-interstitial nephritis, not specified as acute or chronic

  4. 4

    Code N12

    Tubulo-interstitial nephritis, not specified as acute or chronic

Documentation details

Notes for this code

Inclusion terms

  • Interstitial nephritis NOS
  • Pyelitis NOS
  • Pyelonephritis NOS

Code first

No “code first” instruction is listed for N12.

Use additional code

No “use additional code” instruction is listed for N12.

Excludes1

Conditions that should not be reported together with this code.

  • calculous pyelonephritis (N20.9)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for N12.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code N12 mean?

N12 is the FY 2027 U.S. ICD-10-CM code for “Tubulo-interstitial nephritis, not specified as acute or chronic.”

Is N12 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, N12 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is N12 located in ICD-10-CM?

N12 is listed in Chapter 14, Diseases of the genitourinary system (N00-N99), within Renal tubulo-interstitial diseases (N10-N16) (N10–N16), under category N12, Tubulo-interstitial nephritis, not specified as acute or chronic.

What coding notes are listed for N12?

Its listed inclusion terms are Interstitial nephritis NOS; Pyelitis NOS; Pyelonephritis NOS. No code-first instruction is listed. Excludes1 notes: calculous pyelonephritis (N20.9). No Excludes2 note is listed.

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