DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A51 Early syphilis

  • Header · not billable

A51 is not billable. The category heads 15 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Syphilid → A51.39
  • Rupia (syphilitic) → A51.39
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) → A51.0

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A50-A64 Infections with a predominantly sexual mode of transmission (A50-A64)
  3. A51 Early syphilis
Billable codes
15
Subdivisions
7
CC / MCC codes
9 / 1
HCC V28 codes
0
New FY2027
0
Index entries
134

Codes in A51

  1. A51.0
    Primary genital syphilis
    Billable
    Inclusion terms 1

    Inclusion terms

    • Syphilitic chancre NOS
  2. A51.1
    Primary anal syphilis
    Billable
  3. A51.2
    Primary syphilis of other sites
    Billable
  4. A51.3
    Secondary syphilis of skin and mucous membranes
    Header
  5. A51.31
    Condyloma latum
    BillableCC
  6. A51.32
    Syphilitic alopecia
    BillableCC
  7. A51.39
    Other secondary syphilis of skin
    BillableCC
    Inclusion terms 2, Excludes1 1

    Inclusion terms

    • Syphilitic leukoderma
    • Syphilitic mucous patch

    Excludes1

    • late syphilitic leukoderma (A52.79) A52.79
  8. A51.4
    Other secondary syphilis
    Header
  9. A51.41
    Secondary syphilitic meningitis
    BillableMCC
  10. A51.42
    Secondary syphilitic female pelvic disease
    BillableCC
  11. A51.43
    Secondary syphilitic oculopathy
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Secondary syphilitic chorioretinitis
    • Secondary syphilitic iridocyclitis, iritis
    • Secondary syphilitic uveitis
  12. A51.44
    Secondary syphilitic nephritis
    BillableCC
  13. A51.45
    Secondary syphilitic hepatitis
    BillableCC
  14. A51.46
    Secondary syphilitic osteopathy
    BillableCC
  15. A51.49
    Other secondary syphilitic conditions
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Secondary syphilitic lymphadenopathy
    • Secondary syphilitic myositis
  16. A51.5
    Early syphilis, latent
    Billable
    Inclusion terms 1

    Inclusion terms

    • Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.
  17. A51.9
    Early syphilis, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

Block A50-A64 instructions (Excludes1 2, Excludes2 1): printed on the block page.

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic) → A51.0
  • Rupia (syphilitic) → A51.39
  • Syphilid → A51.39
  • Bubosyphilitic (primary) → A51.0
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)urethra → A51.0
  • Lesion(s) (nontraumatic)primary → A51.0
  • Syphilis, syphilitic (acquired)bubo (primary) → A51.0
  • Syphilis, syphilitic (acquired)chancre (multiple) → A51.0
  • Syphilis, syphilitic (acquired)genital (primary) → A51.0
  • Syphilis, syphilitic (acquired)penis (chancre) → A51.0
  • Syphilis, syphilitic (acquired)primary → A51.0
  • Syphilis, syphilitic (acquired)vagina → A51.0
  • Syphilis, syphilitic (acquired)vulva → A51.0
  • Ulcusdurum (syphilitic) → A51.0
  • Vaginitis (acute) (circumscribed) (diffuse) (emphysematous) (nonvenereal) (ulcerative)syphilitic (early) → A51.0
  • Vulvitis (acute) (allergic) (atrophic) (hypertrophic) (intertriginous) (senile)syphilitic (early) → A51.0
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)conjunctiva NEC → A51.2
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)extragenital → A51.2
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)eyelid → A51.2
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)lip → A51.2
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)nipple → A51.2
  • Chancre (any genital site) (hard) (hunterian) (mixed) (primary) (seronegative) (seropositive) (syphilitic)palate, soft → A51.2
  • Condylomalatum → A51.31
  • Condylomasyphilitic → A51.31
  • Condylomavenereal, syphilitic → A51.31
  • Syphilis, syphilitic (acquired)condyloma (latum) → A51.31
  • Alopecia (hereditaria) (seborrheica)specific (syphilitic) → A51.32
  • Alopecia (hereditaria) (seborrheica)syphilitic (secondary) → A51.32
  • Syphilis, syphilitic (acquired)alopecia (secondary) → A51.32
  • Leukoderma, leukodermia NECsyphilitic → A51.39
  • Mucouspatches (syphilitic) → A51.39
  • Patchesmucous (syphilitic) → A51.39
  • Syphilis, syphilitic (acquired)atrophoderma maculatum → A51.39
  • Syphilis, syphilitic (acquired)leukoderma → A51.39
  • Syphilis, syphilitic (acquired)lip → A51.39
  • Syphilis, syphilitic (acquired)macular atrophy of skin → A51.39
  • Syphilis, syphilitic (acquired)mouth (secondary) → A51.39
  • Syphilis, syphilitic (acquired)mucocutaneous (secondary) → A51.39
  • Syphilis, syphilitic (acquired)skin (with ulceration) (early) (secondary) → A51.39
  • Syphilis, syphilitic (acquired)ulcer (any site) (early) (secondary) → A51.39

94 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy