Chronic tubulo-interstitial nephritis (N11) ICD-10-CM
The N11 code range covers chronic tubulo-interstitial nephritis with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- chronic infectious interstitial nephritis
- chronic pyelitis
- chronic pyelonephritis
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Codes in the N11 Range 5 codes · 4 billable
About the N11 Code Range
Chronic tubulo-interstitial nephritis is long-lasting inflammation of the kidney’s tubules and surrounding tissue.
The subdivisions distinguish chronic pyelonephritis, or kidney inflammation, associated with reflux but not obstruction (N11.0) from chronic obstructive pyelonephritis (N11.1). Other chronic tubulo-interstitial nephritis has its own code (N11.8), as does unspecified chronic tubulo-interstitial nephritis (N11.9).
Questions About This Page
How many billable codes are in the N11 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the N11 range classify?
The range classifies chronic tubulo-interstitial nephritis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
