A56.01 Chlamydial cystitis and urethritis

Billable ICD-10-CM code, FY2026.

Applies from A56 Other sexually transmitted chlamydial diseases

Includes

• sexually transmitted diseases due to Chlamydia
• trachomatis

Excludes1 (never code together)

• neonatal chlamydial conjunctivitis (P39.1)
• neonatal chlamydial pneumonia (P23.1)

Excludes2 (not included here)

• chlamydial lymphogranuloma (A55)
• conditions classified to A74.-

MS-DRG index

Defines the logic of DRG(s) 727-728 in MDC 12.

Approximate ICD-9-CM (GEMs)

• 099.53 Other venereal diseases due to chlamydia trachomatis, lower genitourinary sites (approximate)
• 595.4 Cystitis in diseases classified elsewhere (approximate)

Code annotations containing back-references to A56.01

Back-references to A56.01

• Type 1 Excludes: N33 Bladder disorders in diseases classified elsewhere ("chlamydial cystitis (A56.01)")
• Type 1 Excludes: N37 Urethral disorders in diseases classified elsewhere ("chlamydial (A56.01)")

Back-references to A56

• Type 1 Excludes: A74 Other diseases caused by chlamydiae ("sexually transmitted chlamydial diseases (A55-A56)")
• Type 2 Excludes: N34 Urethritis and urethral syndrome ("urethritis in diseases with a predominantly sexual mode of transmission (A50-A64)")

Diagnosis Index entries for A56.01

• Chlamydia, chlamydial › cystitis
• Chlamydia, chlamydial › urethritis
• Cystitis (exudative) (hemorrhagic) (septic) (suppurative) › chlamydial
• Urethritis (anterior) (posterior) › chlamydial

Nearby codes

• A56 Other sexually transmitted chlamydial diseases
• A56.0 Chlamydial infection of lower genitourinary tract
• A56.00 Chlamydial infection of lower genitourinary tract, unspecified
• A56.01 Chlamydial cystitis and urethritis (this code)
• A56.02 Chlamydial vulvovaginitis
• A56.09 Other chlamydial infection of lower genitourinary tract
• A56.1 Chlamydial infection of pelviperitoneum and other genitourinary organs
• A56.11 Chlamydial female pelvic inflammatory disease
• A56.19 Other chlamydial genitourinary infection