2027 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 2027 (October 1, 2026 through September 30, 2027) 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A55: its own notes plus those printed at block A50-A64 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Climatic or tropical bubo
- Durand-Nicolas-Favre disease
- Esthiomene
- Lymphogranuloma inguinale
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- human immunodeficiency virus [HIV] disease (B20)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A55, its category, or a range that includes it.
Applicable To 1
These notes mention A55.
- O98.3 Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium
Excludes1 2
These codes carry an Excludes1 note naming A55: they are not reported together with it, unless the two conditions are unrelated.
- Block A70-A74 Other diseases caused by chlamydiae
- A74 Other diseases caused by chlamydiae
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.
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, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does A55 group to?
When chlamydial lymphogranuloma (venereum) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 759, 727, 743, 728, 758, 757, with relative weights from 0.7687 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.
Can A55 be reported with N34.1?
Not as a rule. The Excludes1 note at block A50-A64, which applies to A55, lists "nonspecific and nongonococcal urethritis (N34.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
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.
