N11
Chronic tubulo-interstitial nephritis
N11 is a non-billable ICD-10-CM code category for chronic tubulo-interstitial nephritis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are N11.0 Nonobstructive reflux-associated chronic pyelonephritis; N11.1 Chronic obstructive pyelonephritis; N11.8 Other chronic tubulo-interstitial nephritis and N11.9 Chronic tubulo-interstitial nephritis, unspecified. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 8 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
- code (B95-B97), to identify infectious agent.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (8 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
- chronic infectious interstitial nephritis
- chronic pyelitis
- chronic pyelonephritis
Also from chapter/block level (1 note)
- pyelonephritis