A55 — Chlamydial lymphogranuloma (venereum)
Is A55 billable?
Yes — A55 is billable for FY2027. A55 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. A55 may be submitted for encounters from October 1, 2026 through September 30, 2027.
A55 at a glance
| Code | A55 |
|---|---|
| Description | Chlamydial lymphogranuloma (venereum) |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does A55 group to?
A55 sits in MDC 12 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 727Inflammation of the Male Reproductive System with MCCmedical
- 728Inflammation of the Male Reproductive System without MCCmedical
How is A55 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to A55. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Durand-Nicolas-Favre disease
- Esthiomene
- Frei's disease
- Genito-anorectal syndrome
- Lymphopathia venereum, veneris
- Nicolas-Favre disease (-Durand)
- Poradenitis, nostras inguinalis or venerea
- Bubo › climatic
- Bubo › tropical
- Disease, diseased › Durand-Nicholas-Favre
- Disease, diseased › Favre-Durand-Nicolas
- Disease, diseased › Frei's
Inclusion terms
Alternative wording in documentation that is classified to A55.
- Climatic or tropical bubo
- Durand-Nicolas-Favre disease
- Esthiomene
- Lymphogranuloma inguinale
Excludes1 — never code together — inherited from A50-A64
The conditions below can never be reported together with A55 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 1
Report an additional code alongside A55 to fully describe the condition. A55 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A55, but a patient may have both at the same time. When documentation supports it, A55 and the excluded code may both be reported.
- 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)
Excludes2 — not included here — inherited from A50-A64
The conditions below are not part of A55, but a patient may have both at the same time. When documentation supports it, A55 and the excluded code may both be reported.
- human immunodeficiency virus [HIV] disease (B20)
How long has A55 existed?
A55 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.