ICD 10 Codes From A50-A64

The ICD-10 code range A50–A64 encompasses “Infections with a predominantly sexual mode of transmission.” These codes are part of Chapter I (Certain infectious and parasitic diseases) and are critical for documenting and tracking sexually transmitted diseases (STDs) globally.

Understanding ICD-10 Code Categories A50-A64 for STIs

This range covers a variety of bacterial, viral, and parasitic infections:

Syphilis ICD-10 Codes (A50–A53)

• A50: Congenital syphilis (infections transmitted from mother to child).
• A51: Early syphilis (includes primary, secondary, and early latent stages).
• A52: Late syphilis (includes cardiovascular and neurosyphilis).
• A53: Other and unspecified syphilis.

Gonococcal and Chlamydial Infection Codes (A54–A56)

• A54: Gonococcal infection (Gonorrhea).
• A55: Chlamydial lymphogranuloma (venereum).
• A56: Other sexually transmitted chlamydial diseases.

Bacterial and Parasitic STI Codes (A57–A59)

• A57: Chancroid.
• A58: Granuloma inguinale.
• A59: Trichomoniasis.

Viral and Unspecified STI Codes (A60–A64)

• A60: Anogenital herpesviral (herpes simplex) infections.
• A63: Other predominantly sexually transmitted diseases, not elsewhere classified (e.g., anogenital warts).
• A64: Unspecified sexually transmitted disease.

ICD-10-CM Coding Guidelines for Sexually Transmitted Diseases

When using these codes, it is important to follow the Official ICD-10-CM Guidelines and note specific exclusions:

Type 1 Excludes for STI Codes

These conditions cannot be coded within the A50–A64 range and have their own specific codes:

• Human immunodeficiency virus (HIV) (B20).
• Nonspecific and nongonococcal urethritis (N34.1).
• Reiter’s disease (M02.3-).

STI Screening Code

For encounters solely for STI screening without symptoms, use code Z11.3.

For detailed sub-codes (e.g., A50.0 for early congenital syphilis), refer to the ICD-10-CM Tabular List.

Would you like a more detailed breakdown of a specific disease within this range, such as the sub-codes for syphilis or gonorrhea?

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