A55 – Chlamydial lymphogranuloma (venereum)
ICD-10-CM 2027 diagnosis code · Infections with a predominantly sexual mode of transmission
ICD-10-CM code
A55
- Code
A55(claims format:A55)- Description
- Chlamydial lymphogranuloma (venereum)
- 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
Notes for A55
Applicable to:
- Climatic or tropical bubo
- Durand-Nicolas-Favre disease
- Esthiomene
- Lymphogranuloma inguinale
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):
Excludes2 (not included here):
- human immunodeficiency virus [HIV] disease (B20)
Index terms for A55
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Nicolas
- Esthiomene
- Bubo, tropical
- Bubo, climatic
- Venereal, bubo
- Frei's disease
- Lymphadenitis, venereal
- Fifth disease, venereal
- Bubo, inguinal, climatic
- Venereal, lymphogranuloma
- Lymphogranuloma, venereum
- Genito-anorectal syndrome
- Disease, diseased, Frei's
- Syndrome, genito-anorectal
- Lymphogranuloma, inguinale
- Disease, diseased, Nicolas
- Lymphogranuloma, chlamydial
- Durand-Nicolas-Favre disease
- Lymphopathia venereum, veneris
- Stricture, rectum, inflammatory
- Disease, diseased, venereal, sixth
- Disease, diseased, venereal, fifth
- Disease, diseased, Favre-Durand-Nicolas
- Disease, diseased, Durand-Nicholas-Favre
- Poradenitis, nostras inguinalis or venerea
Frequently asked questions
What is ICD-10 code A55?
A55 is the ICD-10-CM code for chlamydial lymphogranuloma (venereum), in the block A50-A64 (Infections with a predominantly sexual mode of transmission).
Is A55 a billable code?
Yes. A55 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
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.