N30.9 – Cystitis, unspecified

ICD-10-CM 2027 diagnosis code · Other diseases of the urinary system

Non-billable header

ICD-10-CM code N30.9

Code: N30.9 (claims format: N309)
Description: Cystitis, unspecified
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 14. Diseases of the genitourinary system (N00-N99)
Block: N30-N39 Other diseases of the urinary system
Parent codes: N30

Billable codes under N30.9

N30.9 is a header code and cannot be used on claims. Choose the most specific code:

N30.90 – Cystitis, unspecified without hematuriaBillable
N30.91 – Cystitis, unspecified with hematuriaBillable

Notes inherited from parent codes

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

N30 – Cystitis

Excludes1 (not coded here):

prostatocystitis (N41.3)

Use additional code:

code to identify infectious agent (B95-B97)

Block N30-N39

Excludes2 (not included here):

urinary infection (complicating):
abortion or ectopic or molar pregnancy (O00-O07, O08.8)
pregnancy, childbirth and the puerperium (O23.-, O75.3, O86.2-)

Related codes in N30

N30.0 – Acute cystitisHeader
N30.1 – Interstitial cystitis (chronic)Header
N30.2 – Other chronic cystitisHeader
N30.3 – TrigonitisHeader
N30.4 – Irradiation cystitisHeader
N30.8 – Other cystitisHeader

Frequently asked questions

What is ICD-10 code N30.9?

N30.9 is the ICD-10-CM code for cystitis, unspecified, in the block N30-N39 (Other diseases of the urinary system).

Is N30.9 a billable code?

No. N30.9 is a header code with more specific child codes; report one of the billable codes listed above.

What category does N30.9 belong to?

It belongs to category N30 – Cystitis.

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.