N28.85 – Pyeloureteritis cystica

ICD-10-CM 2027 diagnosis code · Other disorders of kidney and ureter

Billable code

ICD-10-CM code N28.85

Code: N28.85 (claims format: N2885)
Description: Pyeloureteritis cystica
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: N25-N29 Other disorders of kidney and ureter
Parent codes: N28 › N28.8

Notes inherited from parent codes

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

N28.8 – Other specified disorders of kidney and ureter

Excludes1 (not coded here):

hydroureter (N13.4)
ureteric stricture with hydronephrosis (N13.1)
ureteric stricture without hydronephrosis (N13.5)

Block N25-N29

Excludes2 (not included here):

disorders of kidney and ureter with urolithiasis (N20-N23)

Index terms for N28.85

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

Related codes in N28.8

N28.81 – Hypertrophy of kidneyBillable
N28.82 – MegaloureterBillable
N28.83 – NephroptosisBillable
N28.84 – Pyelitis cysticaBillable
N28.86 – Ureteritis cysticaBillable
N28.89 – Other specified disorders of kidney and ureterBillable

Frequently asked questions

What is ICD-10 code N28.85?

N28.85 is the ICD-10-CM code for pyeloureteritis cystica, in the block N25-N29 (Other disorders of kidney and ureter).

Is N28.85 a billable code?

Yes. N28.85 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does N28.85 belong to?

It belongs to category N28 – Other disorders of kidney and ureter, not elsewhere classified.

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.