N12
N12: Tubulo-interstitial nephritis, not specified as acute or chronic
Billable / specific codeICD-10-CM
N12 is a billable, specific ICD-10-CM code for tubulo-interstitial nephritis, not specified as acute or chronic. It is valid for submission on a claim.
Check N12 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- calculous pyelonephritis (N20.9)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Interstitial nephritis NOS
- Pyelitis NOS
- Pyelonephritis NOS
Other codes that can never be billed with N12
Their own Excludes1 notes name this code, so the conflict is not listed above.
- N05Unspecified nephritic syndrome
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
N12 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A55336Billing and Coding: Retroperitoneal Ultrasound
- A56421Billing and Coding: CT of the Abdomen and Pelvis
Alphabetic index entries that lead here
- Pyonephritis
- Nephritis, nephritic›antitubular basement membrane NEC(tubulo-interstitial)
- Nephritis, nephritic›tubulo-interstitial(in)
- Pyelonephritis›nonobstructive
- Disease, diseased›antiglomerular basement membrane antibody›tubulo-interstitial nephritis
- Disease, diseased›renal›with›interstitial nephritis
Code history
Unchanged in every release from FY2024 to FY2027.