N16
Billable codeRenal tubulo-interstitial disorders in diseases classified elsewhere
The ICD-10 code for renal tubulo-interstitial disorders in diseases classified elsewhere is N16.
Clinical notes
Code first
This code represents a manifestation of an underlying disease. Coding convention requires the underlying (etiology) code to be sequenced first, with this code listed second.
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
- 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)
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Pyelonephritis
- Tubulo-interstitial nephritis
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •This code represents a manifestation. Documentation should identify the underlying condition, which must be coded first.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- N10Acute pyelonephritis
- N11Chronic tubulo-interstitial nephritisnon-billable header
- N12Tubulo-interstitial nephritis, not specified as acute or chronic
- N13Obstructive and reflux uropathynon-billable header
- N14Drug- and heavy-metal-induced tubulo-interstitial and tubular conditionsnon-billable header
- N15Other renal tubulo-interstitial diseasesnon-billable header
- N16Renal tubulo-interstitial disorders in diseases classified elsewhere
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 58381Approximate match
- 59081Approximate match
Associated MS-DRGs
N16 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.