N33 Bladder disorders in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• bladder disorder in syphilis (A52.76)
• bladder disorder in tuberculosis (A18.12)
• candidal cystitis (B37.41)
• chlamydial cystitis (A56.01)
• cystitis in gonorrhea (A54.01)
• cystitis in neurogenic bladder (N31.-)
• diphtheritic cystitis (A36.85)
• syphilitic cystitis (A52.76)
• trichomonal cystitis (A59.03)

Code first

• underlying disease, such as:
• schistosomiasis (B65.0-B65.9)

Applies from N33 Bladder disorders in diseases classified elsewhere

Excludes1 (never code together)

• bladder disorder in syphilis (A52.76)
• bladder disorder in tuberculosis (A18.12)
• candidal cystitis (B37.41)
• chlamydial cystitis (A56.01)
• cystitis in gonorrhea (A54.01)
• cystitis in neurogenic bladder (N31.-)
• diphtheritic cystitis (A36.85)
• syphilitic cystitis (A52.76)
• trichomonal cystitis (A59.03)

Code first

• underlying disease, such as:
• schistosomiasis (B65.0-B65.9)

MS-DRG index

Defines the logic of DRG(s) 698-700 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 596.89 Other specified disorders of bladder (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Diagnosis Index entries for N33

• Cystitis (exudative) (hemorrhagic) (septic) (suppurative) › bilharzial
• Disease, diseased › bladder › in (due to) › schistosomiasis (bilharziasis)
• Disorder (of) › bladder › in schistosomiasis
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladder (solitary) (sphincter) NEC › bilharzial
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladder (solitary) (sphincter) NEC › in schistosomiasis (bilharzial)

Nearby codes

• N33 Bladder disorders in diseases classified elsewhere (this code)