A50-A64
Infections with a predominantly sexual mode of transmission
Block coding notes
Excludes 1 never together · Excludes 2 may co-exist
Codes in this block
169 codes
Billableusable codeNon-billableheader / grouping codeRisk-adjusting
- A50Congenital syphilisNon-billable
- A50.0Early congenital syphilis, symptomaticNon-billable
- A50.01Early congenital syphilitic oculopathyBillable
- A50.02Early congenital syphilitic osteochondropathyBillable
- A50.03Early congenital syphilitic pharyngitisBillable
- A50.04Early congenital syphilitic pneumoniaBillable
- A50.05Early congenital syphilitic rhinitisBillable
- A50.06Early cutaneous congenital syphilisBillable
- A50.07Early mucocutaneous congenital syphilisBillable
- A50.08Early visceral congenital syphilisBillable
- A50.09Other early congenital syphilis, symptomaticBillable
- A50.1Early congenital syphilis, latentBillable
- A50.2Early congenital syphilis, unspecifiedBillable
- A50.3Late congenital syphilitic oculopathyNon-billable
- A50.30Late congenital syphilitic oculopathy, unspecifiedBillable
- A50.31Late congenital syphilitic interstitial keratitisBillable
- A50.32Late congenital syphilitic chorioretinitisBillable
- A50.39Other late congenital syphilitic oculopathyBillable
- A50.4Late congenital neurosyphilis [juvenile neurosyphilis]Non-billable
- A50.40Late congenital neurosyphilis, unspecifiedBillable
- A50.41Late congenital syphilitic meningitisBillable
- A50.42Late congenital syphilitic encephalitisBillable
- A50.43Late congenital syphilitic polyneuropathyBillable
- A50.44Late congenital syphilitic optic nerve atrophyBillable
- A50.45Juvenile general paresisBillable
- A50.49Other late congenital neurosyphilisBillable
- A50.5Other late congenital syphilis, symptomaticNon-billable
- A50.51Clutton's jointsBillable
- A50.52Hutchinson's teethBillable
- A50.53Hutchinson's triadBillable
- A50.54Late congenital cardiovascular syphilisBillable
- A50.55Late congenital syphilitic arthropathyBillable
- A50.56Late congenital syphilitic osteochondropathyBillable
- A50.57Syphilitic saddle noseBillable
- A50.59Other late congenital syphilis, symptomaticBillable
- A50.6Late congenital syphilis, latentBillable
- A50.7Late congenital syphilis, unspecifiedBillable
- A50.9Congenital syphilis, unspecifiedBillable
- A51Early syphilisNon-billable
- A51.0Primary genital syphilisBillable
- A51.1Primary anal syphilisBillable
- A51.2Primary syphilis of other sitesBillable
- A51.3Secondary syphilis of skin and mucous membranesNon-billable
- A51.31Condyloma latumBillable
- A51.32Syphilitic alopeciaBillable
- A51.39Other secondary syphilis of skinBillable
- A51.4Other secondary syphilisNon-billable
- A51.41Secondary syphilitic meningitisBillable
- A51.42Secondary syphilitic female pelvic diseaseBillable
- A51.43Secondary syphilitic oculopathyBillable
- A51.44Secondary syphilitic nephritisBillable
- A51.45Secondary syphilitic hepatitisBillable
- A51.46Secondary syphilitic osteopathyBillable
- A51.49Other secondary syphilitic conditionsBillable
- A51.5Early syphilis, latentBillable
- A51.9Early syphilis, unspecifiedBillable
- A52Late syphilisNon-billable
- A52.0Cardiovascular and cerebrovascular syphilisNon-billable
- A52.00Cardiovascular syphilis, unspecifiedBillable
- A52.01Syphilitic aneurysm of aortaBillable
- A52.02Syphilitic aortitisBillable
- A52.03Syphilitic endocarditisBillable
- A52.04Syphilitic cerebral arteritisBillable
- A52.05Other cerebrovascular syphilisBillable
- A52.06Other syphilitic heart involvementBillable
- A52.09Other cardiovascular syphilisBillable
- A52.1Symptomatic neurosyphilisNon-billable
- A52.10Symptomatic neurosyphilis, unspecifiedBillable
- A52.11Tabes dorsalisBillable
- A52.12Other cerebrospinal syphilisBillable
- A52.13Late syphilitic meningitisBillable
- A52.14Late syphilitic encephalitisBillable
- A52.15Late syphilitic neuropathyBillable
- A52.16Charcot's arthropathy (tabetic)Billable
- A52.17General paresisBillable
- A52.19Other symptomatic neurosyphilisBillable
- A52.2Asymptomatic neurosyphilisBillable
- A52.3Neurosyphilis, unspecifiedBillable
- A52.7Other symptomatic late syphilisNon-billable
- A52.71Late syphilitic oculopathyBillable
- A52.72Syphilis of lung and bronchusBillable
- A52.73Symptomatic late syphilis of other respiratory organsBillable
- A52.74Syphilis of liver and other visceraBillable
- A52.75Syphilis of kidney and ureterBillable
- A52.76Other genitourinary symptomatic late syphilisBillable
- A52.77Syphilis of bone and jointBillable
- A52.78Syphilis of other musculoskeletal tissueBillable
- A52.79Other symptomatic late syphilisBillable
- A52.8Late syphilis, latentBillable
- A52.9Late syphilis, unspecifiedBillable
- A53Other and unspecified syphilisNon-billable
- A53.0Latent syphilis, unspecified as early or lateBillable
- A53.9Syphilis, unspecifiedBillable
- A54Gonococcal infectionNon-billable
- A54.0Gonococcal infection of lower genitourinary tract without periurethral or accessory gland abscessNon-billable
- A54.00Gonococcal infection of lower genitourinary tract, unspecifiedBillable
- A54.01Gonococcal cystitis and urethritis, unspecifiedBillable
- A54.02Gonococcal vulvovaginitis, unspecifiedBillable
- A54.03Gonococcal cervicitis, unspecifiedBillable
- A54.09Other gonococcal infection of lower genitourinary tractBillable
- A54.1Gonococcal infection of lower genitourinary tract with periurethral and accessory gland abscessBillable
- A54.2Gonococcal pelviperitonitis and other gonococcal genitourinary infectionNon-billable
- A54.21Gonococcal infection of kidney and ureterBillable
- A54.22Gonococcal prostatitisBillable
- A54.23Gonococcal infection of other male genital organsBillable
- A54.24Gonococcal female pelvic inflammatory diseaseBillable
- A54.29Other gonococcal genitourinary infectionsBillable
- A54.3Gonococcal infection of eyeNon-billable
- A54.30Gonococcal infection of eye, unspecifiedBillable
- A54.31Gonococcal conjunctivitisBillable
- A54.32Gonococcal iridocyclitisBillable
- A54.33Gonococcal keratitisBillable
- A54.39Other gonococcal eye infectionBillable
- A54.4Gonococcal infection of musculoskeletal systemNon-billable
- A54.40Gonococcal infection of musculoskeletal system, unspecifiedBillable
- A54.41Gonococcal spondylopathyBillable
- A54.42Gonococcal arthritisBillable
- A54.43Gonococcal osteomyelitisBillable
- A54.49Gonococcal infection of other musculoskeletal tissueBillable
- A54.5Gonococcal pharyngitisBillable
- A54.6Gonococcal infection of anus and rectumBillable
- A54.8Other gonococcal infectionsNon-billable
- A54.81Gonococcal meningitisBillable
- A54.82Gonococcal brain abscessBillable
- A54.83Gonococcal heart infectionBillable
- A54.84Gonococcal pneumoniaBillable
- A54.85Gonococcal peritonitisBillable
- A54.86Gonococcal sepsisBillable
- A54.89Other gonococcal infectionsBillable
- A54.9Gonococcal infection, unspecifiedBillable
- A55Chlamydial lymphogranuloma (venereum)Billable
- A56Other sexually transmitted chlamydial diseasesNon-billable
- A56.0Chlamydial infection of lower genitourinary tractNon-billable
- A56.00Chlamydial infection of lower genitourinary tract, unspecifiedBillable
- A56.01Chlamydial cystitis and urethritisBillable
- A56.02Chlamydial vulvovaginitisBillable
- A56.09Other chlamydial infection of lower genitourinary tractBillable
- A56.1Chlamydial infection of pelviperitoneum and other genitourinary organsNon-billable
- A56.11Chlamydial female pelvic inflammatory diseaseBillable
- A56.19Other chlamydial genitourinary infectionBillable
- A56.2Chlamydial infection of genitourinary tract, unspecifiedBillable
- A56.3Chlamydial infection of anus and rectumBillable
- A56.4Chlamydial infection of pharynxBillable
- A56.8Sexually transmitted chlamydial infection of other sitesBillable
- A57ChancroidBillable
- A58Granuloma inguinaleBillable
- A59TrichomoniasisNon-billable
- A59.0Urogenital trichomoniasisNon-billable
- A59.00Urogenital trichomoniasis, unspecifiedBillable
- A59.01Trichomonal vulvovaginitisBillable
- A59.02Trichomonal prostatitisBillable
- A59.03Trichomonal cystitis and urethritisBillable
- A59.09Other urogenital trichomoniasisBillable
- A59.8Trichomoniasis of other sitesBillable
- A59.9Trichomoniasis, unspecifiedBillable
- A60Anogenital herpesviral [herpes simplex] infectionsNon-billable
- A60.0Herpesviral infection of genitalia and urogenital tractNon-billable
- A60.00Herpesviral infection of urogenital system, unspecifiedBillable
- A60.01Herpesviral infection of penisBillable
- A60.02Herpesviral infection of other male genital organsBillable
- A60.03Herpesviral cervicitisBillable
- A60.04Herpesviral vulvovaginitisBillable
- A60.09Herpesviral infection of other urogenital tractBillable
- A60.1Herpesviral infection of perianal skin and rectumBillable
- A60.9Anogenital herpesviral infection, unspecifiedBillable
- A63Other predominantly sexually transmitted diseases, not elsewhere classifiedNon-billable
- A63.0Anogenital (venereal) wartsBillable
- A63.8Other specified predominantly sexually transmitted diseasesBillable
- A64Unspecified sexually transmitted diseaseBillable
Official Guidelines for A50-A64
FY 2026 ›I.C.1Chapter-specific guidanceChapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9
Subsections
- I.C.1.aHuman Immunodeficiency Virus (HIV) Infections
- I.C.1.bInfectious agents as the cause of diseases classified to other chapters
- I.C.1.cInfections resistant to antibiotics
- I.C.1.dSepsis, Severe Sepsis, and Septic Shock Infections resistant to antibiotics
- I.C.1.eMethicillin Resistant Staphylococcus aureus (MRSA) Conditions
- I.C.1.fZika virus infections
- I.C.1.gCoronavirus infections