N11.9 – Chronic tubulo-interstitial nephritis, unspecified

ICD-10-CM 2027 diagnosis code · Renal tubulo-interstitial diseases

Billable code

ICD-10-CM code N11.9

Code: N11.9 (claims format: N119)
Description: Chronic tubulo-interstitial nephritis, unspecified
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
Parent codes: N11

Notes for N11.9

Applicable to:

Chronic interstitial nephritis NOS
Chronic pyelitis NOS
Chronic pyelonephritis NOS

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

N11 – Chronic tubulo-interstitial nephritis

Includes:

chronic infectious interstitial nephritis
chronic pyelitis
chronic pyelonephritis

Use additional code:

code (B95-B97), to identify infectious agent.

Block N10-N16

Includes:

pyelonephritis

Excludes1 (not coded here):

pyeloureteritis cystica (N28.85)

Index terms for N11.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in N11

Frequently asked questions

What is ICD-10 code N11.9?

N11.9 is the ICD-10-CM code for chronic tubulo-interstitial nephritis, unspecified, in the block N10-N16 (Renal tubulo-interstitial diseases).

Is N11.9 a billable code?

Yes. N11.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does N11.9 belong to?

It belongs to category N11 – Chronic tubulo-interstitial nephritis.

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.