All ICD10 Codes
A56Non-billable

Other sexually transmitted chlamydial diseases

Certain Infectious and Parasitic Diseases·Infections with a predominantly sexual mode of transmission (A50-A64)·category·FY 2026

Use a more specific code (4 billable, 2 non-billable)
A56.0Chlamydial infection of lower genitourinary tracthas subcodesA56.1Chlamydial infection of pelviperitoneum and other genitourinary organshas subcodesA56.2Chlamydial infection of genitourinary tract, unspecifiedA56.3Chlamydial infection of anus and rectumA56.4Chlamydial infection of pharynxA56.8Sexually transmitted chlamydial infection of other sites

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here. Use a different code.)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here. Code separately if applicable.)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use Additional Code
  • code to identify resistance to antimicrobial drugs (Z16.-)

A50-A64 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • nonspecific and nongonococcal urethritis (N34.1)
  • Reiter's disease (M02.3-)
Excludes2(Not included here. Code separately if applicable.)
  • human immunodeficiency virus [HIV] disease (B20)

Instructional Notes

Includes
  • sexually transmitted diseases due to Chlamydia
  • trachomatis
Excludes1(Not coded here. Use a different code.)
  • neonatal chlamydial conjunctivitis (P39.1)
  • neonatal chlamydial pneumonia (P23.1)
Excludes2(Not included here. Code separately if applicable.)
  • chlamydial lymphogranuloma (A55)
  • conditions classified to A74.-

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A50-A64Infections with a predominantly sexual mode of transmission (A50-A64)
A56Other sexually transmitted chlamydial diseasesNot billable
A56.0Chlamydial infection of lower genitourinary tractSubcodes
A56.1Chlamydial infection of pelviperitoneum and other genitourinary organsSubcodes
A56.2Chlamydial infection of genitourinary tract, unspecifiedBillable
A56.3Chlamydial infection of anus and rectumBillable
A56.4Chlamydial infection of pharynxBillable
A56.8Sexually transmitted chlamydial infection of other sitesBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.