2019 ICD-10-CM Diagnosis Code A51.5

Early syphilis, latent

    2016 2017 2018 2019 Billable/Specific Code
  • A51.5 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM A51.5 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of A51.5 - other international versions of ICD-10 A51.5 may differ.
Applicable To
  • Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.
The following code(s) above A51.5 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to A51.5:
  • A00-B99
    2019 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    Includes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • 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 to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
  • A50-A64
    2019 ICD-10-CM Range A50-A64

    Infections with a predominantly sexual mode of transmission

    Type 1 Excludes
    • human immunodeficiency virus [HIV] disease (B20)
    • nonspecific and nongonococcal urethritis (N34.1)
    • Reiter's disease (M02.3-)
    Infections with a predominantly sexual mode of transmission
Approximate Synonyms
  • Latent early syphilis
  • Serological relapse after treatment of latent early syphilis
  • Syphilis
  • Syphilis, latent, early
ICD-10-CM A51.5 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 867 Other infectious and parasitic diseases diagnoses with mcc
  • 868 Other infectious and parasitic diseases diagnoses with cc
  • 869 Other infectious and parasitic diseases diagnoses without cc/mcc

Convert A51.5 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to A51.5:
  • Syphilis, syphilitic (acquired) A53.9
    ICD-10-CM Diagnosis Code A53.9

    Syphilis, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Infection due to Treponema pallidum NOS
    • Syphilis (acquired) NOS
    Type 1 Excludes
    • syphilis NOS under two years of age (A50.2)
    • early A51.9
      ICD-10-CM Diagnosis Code A51.9

      Early syphilis, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      • latent (without manifestations) (less than 2 years after infection) A51.5
        • negative spinal fluid test A51.5
        • serological relapse after treatment A51.5
        • serology positive A51.5
    • latent A53.0
      ICD-10-CM Diagnosis Code A53.0

      Latent syphilis, unspecified as early or late

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Latent syphilis NOS
      • Positive serological reaction for syphilis
      • positive serology (only finding) A53.0
        ICD-10-CM Diagnosis Code A53.0

        Latent syphilis, unspecified as early or late

          2016 2017 2018 2019 Billable/Specific Code
        Applicable To
        • Latent syphilis NOS
        • Positive serological reaction for syphilis
        • early, or less than 2 years after infection A51.5
      • early, or less than 2 years after infection A51.5

ICD-10-CM Codes Adjacent To A51.5
A51.32 Syphilitic alopecia
A51.39 Other secondary syphilis of skin
A51.4 Other secondary syphilis
A51.41 Secondary syphilitic meningitis
A51.42 Secondary syphilitic female pelvic disease
A51.43 Secondary syphilitic oculopathy
A51.44 Secondary syphilitic nephritis
A51.45 Secondary syphilitic hepatitis
A51.46 Secondary syphilitic osteopathy
A51.49 Other secondary syphilitic conditions
A51.5 Early syphilis, latent
A51.9 Early syphilis, unspecified
A52 Late syphilis
A52.0 Cardiovascular and cerebrovascular syphilis
A52.00 Cardiovascular syphilis, unspecified
A52.01 Syphilitic aneurysm of aorta
A52.02 Syphilitic aortitis
A52.03 Syphilitic endocarditis
A52.04 Syphilitic cerebral arteritis
A52.05 Other cerebrovascular syphilis
A52.06 Other syphilitic heart involvement

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.