2020 ICD-10-CM Diagnosis Code A51.0

Primary genital syphilis

    2016 2017 2018 2019 2020 Billable/Specific Code
  • A51.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM A51.0 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of A51.0 - other international versions of ICD-10 A51.0 may differ.
Applicable To
  • Syphilitic chancre NOS
The following code(s) above A51.0 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 A51.0:
  • A00-B99
    2020 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
    2020 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
  • Primary syphilis
  • Syphilis genitalia, primary
  • Syphilis, primary
Clinical Information
  • The primary sore of syphilis, a painless indurated, eroded papule, occurring at the site of entry of the infection.
ICD-10-CM A51.0 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 727 Inflammation of the male reproductive system with mcc
  • 728 Inflammation of the male reproductive system without mcc
  • 742 Uterine and adnexa procedures for non-malignancy with cc/mcc
  • 743 Uterine and adnexa procedures for non-malignancy without cc/mcc
  • 757 Infections, female reproductive system with mcc
  • 758 Infections, female reproductive system with cc
  • 759 Infections, female reproductive system without cc/mcc

Convert A51.0 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
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to A51.0:
  • Type 1 Excludes: N77.0
    , N77.1
    ICD-10-CM Diagnosis Code N77.0

    Ulceration of vulva in diseases classified elsewhere

      2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
    Code First
    • underlying disease, such as:
    • Behçet's disease (M35.2)
    Type 1 Excludes
    • ulceration of vulva in gonococcal infection (A54.02)
    • ulceration of vulva in herpesviral [herpes simplex] infection (A60.04)
    • ulceration of vulva in syphilis (A51.0)
    • ulceration of vulva in tuberculosis (A18.18)
    ICD-10-CM Diagnosis Code N77.1

    Vaginitis, vulvitis and vulvovaginitis in diseases classified elsewhere

      2016 2017 2018 2019 2020 Billable/Specific Code Manifestation Code
    Code First
    • underlying disease, such as:
    • pinworm (B80)
    Type 1 Excludes
    • candidal vulvovaginitis (B37.3)
    • chlamydial vulvovaginitis (A56.02)
    • gonococcal vulvovaginitis (A54.02)
    • herpesviral [herpes simplex] vulvovaginitis (A60.04)
    • trichomonal vulvovaginitis (A59.01)
    • tuberculous vulvovaginitis (A18.18)
    • vulvovaginitis in early syphilis (A51.0)
    • vulvovaginitis in late syphilis (A52.76)

Diagnosis Index entries containing back-references to A51.0:
  • Bubo I88.8
    ICD-10-CM Diagnosis Code I88.8

    Other nonspecific lymphadenitis

      2016 2017 2018 2019 2020 Billable/Specific Code
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) A51.0
    • urethra A51.0
  • Lesion(s) (nontraumatic)
  • Syphilis, syphilitic (acquired) A53.9
    ICD-10-CM Diagnosis Code A53.9

    Syphilis, unspecified

      2016 2017 2018 2019 2020 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)
    • chancre (multiple) A51.0
      • Rollet's A51.0
    • early A51.9
      ICD-10-CM Diagnosis Code A51.9

      Early syphilis, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • symptomatic A51.9
        ICD-10-CM Diagnosis Code A51.9

        Early syphilis, unspecified

          2016 2017 2018 2019 2020 Billable/Specific Code
        • primary, except extragenital chancre A51.0
    • penis (chancre) A51.0
    • primary A51.0
      • genital A51.0
    • vagina A51.0
    • vulva A51.0
    • bubo A51.0 (primary)
    • genital A51.0 (primary)
  • Ulcus - see also Ulcer
    • durum (syphilitic) A51.0
  • Vaginitis (acute) (circumscribed) (diffuse) (emphysematous) (nonvenereal) (ulcerative) N76.0
    ICD-10-CM Diagnosis Code N76.0

    Acute vaginitis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Acute vulvovaginitis
    • Vaginitis NOS
    • Vulvovaginitis NOS
  • Vulvitis (acute) (allergic) (atrophic) (hypertrophic) (intertriginous) (senile) N76.2
    ICD-10-CM Diagnosis Code N76.2

    Acute vulvitis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Vulvitis NOS

ICD-10-CM Codes Adjacent To A51.0
A50.53 Hutchinson's triad
A50.54 Late congenital cardiovascular syphilis
A50.55 Late congenital syphilitic arthropathy
A50.56 Late congenital syphilitic osteochondropathy
A50.57 Syphilitic saddle nose
A50.59 Other late congenital syphilis, symptomatic
A50.6 Late congenital syphilis, latent
A50.7 Late congenital syphilis, unspecified
A50.9 Congenital syphilis, unspecified
A51 Early syphilis
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
A51.31 Condyloma latum
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

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