N11 — Chronic tubulo-interstitial nephritis
Is N11 billable?
No — N11 is a non-billable header code. N11 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath N11.
N11 at a glance
| Code | N11 |
|---|---|
| Description | Chronic tubulo-interstitial nephritis |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Use additional code
Report an additional code alongside N11 to fully describe the condition. N11 is sequenced first.
- code (B95-B97), to identify infectious agent.
Includes
Conditions classified to N11.
- chronic infectious interstitial nephritis
- chronic pyelitis
- chronic pyelonephritis
Excludes1 — never code together — inherited from N10-N16
The conditions below can never be reported together with N11 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- pyeloureteritis cystica (N28.85)
Excludes2 — not included here — inherited from Chapter 14
The conditions below are not part of N11, but a patient may have both at the same time. When documentation supports it, N11 and the excluded code may both be reported.
- 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)
What codes fall under N11? (4)
How long has N11 existed?
N11 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.