A50 – Congenital syphilis

ICD-10-CM 2027 diagnosis code · Infections with a predominantly sexual mode of transmission

Non-billable header

ICD-10-CM code A50

Code: A50 (claims format: A50)
Description: Congenital syphilis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: A50-A64 Infections with a predominantly sexual mode of transmission

Billable codes under A50

A50 is a header code and cannot be used on claims. Choose the most specific code:

A50.0 – Early congenital syphilis, symptomaticHeader (more codes below)
A50.1 – Early congenital syphilis, latentBillable
A50.2 – Early congenital syphilis, unspecifiedBillable
A50.3 – Late congenital syphilitic oculopathyHeader (more codes below)
A50.4 – Late congenital neurosyphilis [juvenile neurosyphilis]Header (more codes below)
A50.5 – Other late congenital syphilis, symptomaticHeader (more codes below)
A50.6 – Late congenital syphilis, latentBillable
A50.7 – Late congenital syphilis, unspecifiedBillable
A50.9 – Congenital syphilis, unspecifiedBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block A50-A64

Excludes1 (not coded here):

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

Excludes2 (not included here):

human immunodeficiency virus [HIV] disease (B20)

Frequently asked questions

What is ICD-10 code A50?

A50 is the ICD-10-CM code for congenital syphilis, in the block A50-A64 (Infections with a predominantly sexual mode of transmission).

Is A50 a billable code?

No. A50 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.