1. ICD-10-CM Codes
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2. N00-N99
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3. N10-N16
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4. N12-
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5. 2023 ICD-10-CM Diagnosis Code N12

2023 ICD-10-CM Diagnosis Code N12

Tubulo-interstitial nephritis, not specified as acute or chronic

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

• N12 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Tubulo-interstitial nephritis, not spcf as acute or chronic
• The 2023 edition of ICD-10-CM N12 became effective on October 1, 2022.
• This is the American ICD-10-CM version of N12 - other international versions of ICD-10 N12 may differ.

• Drug-induced interstitial nephritis
• Interstitial nephritis
• Nephritis, interstitial, drug induced
• Nephritis, tubulo-interstitial, primary/idiopathic
• Nephritis, tubulo-interstitial, secondary
• Obstructive pyelonephritis
• Primary tubulointerstitial nephritis
• Pyelonephritis
• Pyelonephritis (kidney infection)
• Secondary tubulointerstitial nephritis

• 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.

• 689 Kidney and urinary tract infections with mcc
• 690 Kidney and urinary tract infections without mcc
• 791 Prematurity with major problems
• 793 Full term neonate with major problems

Convert N12 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Type 1 Excludes: N05
  ICD-10-CM Diagnosis Code N05

  Unspecified nephritic syndrome

  2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

  Includes

  • glomerular disease NOS
  • glomerulonephritis NOS
  • nephritis NOS
  • nephropathy NOS and renal disease NOS with morphological lesion specified in .0-.8

  Type 1 Excludes

  • nephropathy NOS with no stated morphological lesion (N28.9)
  • renal disease NOS with no stated morphological lesion (N28.9)
  • tubulo-interstitial nephritis NOS (N12)

• Disease, diseased - see also Syndrome
  • antiglomerular basement membrane (anti- GBM) M31.0
    ICD-10-CM Diagnosis Code M31.0

    Hypersensitivity angiitis

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Goodpasture's syndrome
    • tubulo-interstitial nephritis N12
  • renal (functional) (pelvis) N28.9
    - see also Disease, kidney
    ICD-10-CM Diagnosis Code N28.9

    Disorder of kidney and ureter, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Nephropathy NOS
    • Renal disease (acute) NOS
    • Renal insufficiency (acute)

    Type 1 Excludes

    • chronic renal insufficiency (N18.9)
    • unspecified nephritic syndrome (N05.-)
    • with
      • interstitial nephritis N12
• Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) N05.9
  ICD-10-CM Diagnosis Code N05.9

  Unspecified nephritic syndrome with unspecified morphologic changes

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • antitubular basement membrane (tubulo-interstitial) N12
  • tubulo-interstitial (in) N12
• Pyelonephritis - see also Nephritis, tubulo-interstitial
  • nonobstructive N12
• Pyonephritis N12

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.