N12
Billable codeTubulo-interstitial nephritis, not specified as acute or chronic
The ICD-10 code for tubulo-interstitial nephritis, not specified as acute or chronic is N12.
Clinical notes
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).
- calculous pyelonephritis (N20.9)
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Interstitial nephritis NOS
- Pyelitis NOS
- Pyelonephritis NOS
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.
- •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
- 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
- N12Tubulo-interstitial nephritis, not specified as acute or chronic
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 59080Approximate match
Associated MS-DRGs
N12 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.