N12 – Tubulo-interstitial nephritis, not specified as acute or chronic
ICD-10-CM 2027 diagnosis code · Renal tubulo-interstitial diseases
ICD-10-CM code
N12
- Code
N12(claims format:N12)- Description
- Tubulo-interstitial nephritis, not specified as acute or chronic
- Short description
- Tubulo-interstitial nephritis, not spcf as acute or chronic
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 14. Diseases of the genitourinary system (N00-N99)
- Block
- N10-N16 Renal tubulo-interstitial diseases
Notes for N12
Applicable to:
- Interstitial nephritis NOS
- Pyelitis NOS
- Pyelonephritis NOS
Excludes1 (not coded here):
- calculous pyelonephritis (N20.9)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block N10-N16
Includes:
- pyelonephritis
Excludes1 (not coded here):
- pyeloureteritis cystica (N28.85)
Index terms for N12
Entries in the ICD-10-CM alphabetic index that lead to this code:
Frequently asked questions
What is ICD-10 code N12?
N12 is the ICD-10-CM code for tubulo-interstitial nephritis, not specified as acute or chronic, in the block N10-N16 (Renal tubulo-interstitial diseases).
Is N12 a billable code?
Yes. N12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.