N16 is a billable/specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Renal tubulo-interstitial disorders in diseases classified elsewhere.
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Pyelonephritis
Tubulo-interstitial nephritis
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)
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 with .29)
Syphilitic pyelonephritis and tubulo-interstitial nephritis (A52.75)
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