All ICD10 Codes

A50-A64

Non-Billable
ChapterA00–B99
Rankblock
Official Description

Infections with a predominantly sexual mode of transmission (A50-A64)

Use a more specific code (4 billable, 9 non-billable)
A50Congenital syphilishas subcodesA51Early syphilishas subcodesA52Late syphilishas subcodesA53Other and unspecified syphilishas subcodesA54Gonococcal infectionhas subcodesA55Chlamydial lymphogranuloma (venereum)A56Other sexually transmitted chlamydial diseaseshas subcodesA57ChancroidA58Granuloma inguinaleA59Trichomoniasishas subcodesA60Anogenital herpesviral [herpes simplex] infectionshas subcodesA63Other predominantly sexually transmitted diseases, not elsewhere classifiedhas subcodesA64Unspecified sexually transmitted disease
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

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.-)

Instructional Notes

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)

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
A50-A64Infections with a predominantly sexual mode of transmission (A50-A64)Not billable
A50Congenital syphilisSubcodes
A51Early syphilisSubcodes
A52Late syphilisSubcodes
A53Other and unspecified syphilisSubcodes
A54Gonococcal infectionSubcodes
A55Chlamydial lymphogranuloma (venereum)Billable
A56Other sexually transmitted chlamydial diseasesSubcodes
A57ChancroidBillable
A58Granuloma inguinaleBillable
A59TrichomoniasisSubcodes
A60Anogenital herpesviral [herpes simplex] infectionsSubcodes
A63Other predominantly sexually transmitted diseases, not elsewhere classifiedSubcodes
A64Unspecified sexually transmitted diseaseBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A50-A64:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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