N11 – Chronic tubulo-interstitial nephritis
ICD-10-CM 2027 diagnosis code · Renal tubulo-interstitial diseases
ICD-10-CM code
N11
- Code
N11(claims format:N11)- Description
- Chronic tubulo-interstitial nephritis
- Billable
- No – use a more specific code below
- 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
Billable codes under N11
N11 is a header code and cannot be used on claims. Choose the most specific code:
Notes for N11
Includes:
- chronic infectious interstitial nephritis
- chronic pyelitis
- chronic pyelonephritis
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)
Frequently asked questions
What is ICD-10 code N11?
N11 is the ICD-10-CM code for chronic tubulo-interstitial nephritis, in the block N10-N16 (Renal tubulo-interstitial diseases).
Is N11 a billable code?
No. N11 is a header code with more specific child codes; report one of the billable codes listed above.
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.