Renal tubulo-interstitial disorders in diseases classified elsewhere (N16) ICD-10-CM
The N16 code range covers renal tubulo-interstitial disorders in diseases classified elsewhere with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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.
- underlying disease, such as:
- brucellosis A23.0 A23.9
- cryoglobulinemia D89.1
- glycogen storage disease E74.0
- leukemia C91 C95
- lymphoma C81.0 C85.9 C96.0 C96.9
- multiple myeloma C90.0
- sepsis A40.0 A41.9
- Wilson's disease E83.01
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
Codes in the N16 Range 1 codes · 1 billable
- N16 Renal tubulo-interstitial disorders in diseases classified elsewhere
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the N16 range.
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.
About the N16 Code Range
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.
Questions About This Page
How many billable codes are in the N16 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the N16 range classify?
The range classifies renal tubulo-interstitial disorders in diseases classified elsewhere. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
