Tubulo-interstitial nephritis, not specified as acute or chronic N12-

Applicable To
  • Interstitial nephritis NOS
  • Pyelitis NOS
  • Pyelonephritis NOS
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as N12. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • calculous pyelonephritis (
    ICD-10-CM Diagnosis Code N20.9

    Urinary calculus, unspecified

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
Clinical Information
  • A disorder characterized by an infectious process involving the kidney.
  • An acute or chronic inflammatory process affecting the kidney. It is caused by bacteria and in most cases it is the result of a urinary tract infection. Signs and symptoms include fever, chills, flank pain, painful and frequent urination, cloudy or bloody urine, and confusion.
  • Diffuse or local inflammation and edema of the interstitial tissue of the kidney, including the tubules.
  • Inflammation of the interstitial tissue of the kidney. This term is generally used for primary inflammation of kidney tubules and/or surrounding interstitium. For primary inflammation of glomerular interstitium, see glomerulonephritis. Infiltration of the inflammatory cells into the interstitial compartment results in edema, increased spaces between the tubules, and tubular renal dysfunction.
  • Inflammation of the kidney and its pelvis due to infection.
  • Inflammation of the kidney involving the renal parenchyma (the nephrons); kidney pelvis; and kidney calices. It is characterized by abdominal pain; fever; nausea; vomiting; and occasionally diarrhea.
  • 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.
  • N12 Tubulo-interstitial nephritis, not specified as acute or chronic