Early syphilis, unspecified

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

What has happened to this code

Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2007 Added to the draft code set draft Early syphilis, unspecified

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from the A50-A64 section Infections with a predominantly sexual mode of transmission (A50-A64)

Excludes1 - never coded here

nonspecific and nongonococcal urethritis (N34.1)
Reiter's disease (M02.3-)

Excludes2 - not included here

human immunodeficiency virus [HIV] disease (B20)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Lues, luetic
Lesion > syphilitic
Disease, diseased > venereal
Treponema pallidum infection
Disease, diseased > syphilitic
Treponematosis > due to > T. pallidum
Infection, infected, infective > specific
Disease, diseased > sexually transmitted > syphilis
Infection, infected, infective > Treponema pallidum
Syphilis, syphilitic > early
Syphilis, syphilitic > early > relapse
Syphilis, syphilitic > early > symptomatic
Syphilis, syphilitic > recently acquired, symptomatic
Syphilis, syphilitic > age under 2 years NOS > acquired

Codes in the same group

Code	Description	Status
A51.0	Primary genital syphilis	Valid
A51.1	Primary anal syphilis	Valid
A51.2	Primary syphilis of other sites	Valid
A51.3	Secondary syphilis of skin and mucous membranes	Not billable
A51.4	Other secondary syphilis	Not billable
A51.5	Early syphilis, latent	Valid