A50.55 – Late congenital syphilitic arthropathy
ICD-10-CM 2027 diagnosis code · Infections with a predominantly sexual mode of transmission
ICD-10-CM code
A50.55
- Code
A50.55(claims format:A5055)- Description
- Late congenital syphilitic arthropathy
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- A50 › A50.5
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
A50.5 – Other late congenital syphilis, symptomatic
Applicable to:
- Any congenital syphilitic condition specified as late or manifest two years or more after birth.
Block A50-A64
Excludes1 (not coded here):
Excludes2 (not included here):
- human immunodeficiency virus [HIV] disease (B20)
Index terms for A50.55
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in A50.5
- A50.51 – Clutton's jointsBillable
- A50.52 – Hutchinson's teethBillable
- A50.53 – Hutchinson's triadBillable
- A50.54 – Late congenital cardiovascular syphilisBillable
- A50.56 – Late congenital syphilitic osteochondropathyBillable
- A50.57 – Syphilitic saddle noseBillable
- A50.59 – Other late congenital syphilis, symptomaticBillable
Frequently asked questions
What is ICD-10 code A50.55?
A50.55 is the ICD-10-CM code for late congenital syphilitic arthropathy, in the block A50-A64 (Infections with a predominantly sexual mode of transmission).
Is A50.55 a billable code?
Yes. A50.55 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does A50.55 belong to?
It belongs to category A50 – Congenital syphilis.
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.