1. Home
  2. ICD-10-CM Codes List
  3. N00–N99
  4. N10-N16
  5. Renal tubulo-interstitial disorders in diseases classified elsewhere (N16)

Renal tubulo-interstitial disorders in diseases classified elsewhere (N16)

The ICD-10 code N16 is used to classify renal tubulo-interstitial disorders that occur as part of other underlying diseases. This code covers conditions where the kidney's tubules and interstitial tissue are affected due to systemic or associated illnesses, rather than primary kidney disease.

Specifically, N16 includes disorders such as Immunoglobulin G4 related kidney disease (also called Immunoglobulin G4 related disease), acute tubulo-interstitial nephritis caused by immunological conditions, and renal damage linked to cystinosis. It also covers pyelonephritis and pyelitis when these infections or inflammations arise alongside other health problems. These synonyms illustrate the diverse conditions captured under this code, helping medical coders accurately assign the ICD-10 code for renal tubulo-interstitial disorders in diseases classified elsewhere. Understanding this classification aids in distinguishing secondary kidney involvement from primary kidney diseases in medical records and billing.

Instructional Notations

Inclusion Terms

These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

  • Pyelonephritis
  • Tubulo-interstitial nephritis

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • diphtheritic pyelonephritis and tubulo-interstitial nephritis A36.84
  • pyelonephritis and tubulo-interstitial nephritis in candidiasis B37.49
  • pyelonephritis and tubulo-interstitial nephritis in cystinosis E72.04
  • pyelonephritis and tubulo-interstitial nephritis in salmonella infection A02.25
  • pyelonephritis and tubulo-interstitial nephritis in sarcoidosis D86.84
  • pyelonephritis and tubulo-interstitial nephritis in Sjogren syndrome M35.04
  • pyelonephritis and tubulo-interstitial nephritis in systemic lupus erythematosus M32.15
  • pyelonephritis and tubulo-interstitial nephritis in toxoplasmosis B58.83
  • renal tubular degeneration in diabetes E08 E13
  • syphilitic pyelonephritis and tubulo-interstitial nephritis A52.75

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Pyelitis

Inflammation of the KIDNEY PELVIS and KIDNEY CALICES where urine is collected before discharge, but does not involve the renal parenchyma (the NEPHRONS) where urine is processed.