A51

Classification

Category:Certain infectious and parasitic diseases

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Coding Guidance

A51 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.

Includes

From A00-B99

Excludes 1

Excludes 2

Z22

carrier or suspected carrier of infectious disease

O98

infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium

P35-P39

infectious and parasitic diseases specific to the perinatal period

J00-J22

influenza and other acute respiratory infections

Use Additional Code

From A00-B99

code to identify resistance to antimicrobial drugs

More Specific Codes

A51.0

Primary genital syphilis

A51.1

Primary anal syphilis

A51.2

Primary syphilis of other sites

A51.3

Secondary syphilis of skin and mucous membranes

A51.4

Other secondary syphilis

A51.5

Early syphilis, latent

A51.9

Early syphilis, unspecified

External Resources

2025 ICD-10 guidelines from CMS.gov