2026 ICD-10-CM Diagnosis Code A55Chlamydial lymphogranuloma (venereum)
ICD-10-CM Codes›A00–B99›A50-A64›venereum
- Billable — Valid for Submission
- Not Chronic
A55 is a billable ICD-10-CM diagnosis code for chlamydial lymphogranuloma (venereum). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 727 through 728, 742 through 743, 757 through 759. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sexually transmitted infections (excluding HIV and hepatitis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic acquired lymphedema
- Chronic disease of lymphatic vessels
- Early lymphogranuloma venereum
- Esthiomene
- Infection of skin caused by Chlamydia
- Infectious edema
- Late lymphogranuloma venereum
- Latent lymphogranuloma venereum
- Lymphedema due to infection
- Lymphedema due to lymphogranuloma venereum
- Lymphogranuloma venereum
- Venereal disease caused by Chlamydia trachomatis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Climatic or tropical bubo
- Durand-Nicolas-Favre disease
- Esthiomene
- Lymphogranuloma inguinale
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Esthiomene A55
Frei's disease A55
Lymphogranuloma (malignant) See Also: Lymphoma, Hodgkin;
Stricture See Also: Stenosis;
Syndrome See Also: Disease;
genito-anorectal A55
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Lymphogranuloma Venereum
subacute inflammation of the inguinal lymph glands caused by certain immunotypes of chlamydia trachomatis. it is a sexually transmitted disease in the u.s. but is more widespread in developing countries. it is distinguished from granuloma venereum (see granuloma inguinale), which is caused by calymmatobacterium granulomatis.Lymphogranuloma Venereum
infection with the organism mycobacterium.
Patient EducationClinical
Chlamydia Infections
Chlamydia is a common sexually transmitted infection (STI). It is caused by bacteria called Chlamydia trachomatis. Anyone can get chlamydia. It often doesn't cause symptoms, so people may not know that they have it. Antibiotics can cure it. But if it's not treated, chlamydia can cause serious health problems.
The full article covers:
- What is chlamydia?
- How is chlamydia spread?
- Who is more likely to get chlamydia?
- What are the symptoms of chlamydia?
- How is chlamydia diagnosed?
- Who should be tested for chlamydia?
- What other problems can chlamydia cause?
- What are the treatments for chlamydia?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A55 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A55Overview
What is the ICD-10 code for chlamydial lymphogranuloma (venereum)?
The ICD-10-CM code for chlamydial lymphogranuloma (venereum) is A55. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is A55 (Chlamydial lymphogranuloma (venereum)) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report chlamydial lymphogranuloma (venereum) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A55 group to?
When chlamydial lymphogranuloma (venereum) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 727, 728, 742, 743, 757, 758, 759, with relative weights from 0.6636 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A55?
Under the General Equivalence Mappings, chlamydial lymphogranuloma (venereum) converts to ICD-9-CM 099.1 (lymphogranuloma venereum). The mapping is a direct match.
