2027 ICD-10-CM Diagnosis Code A57Chancroid

ICD-10-CM Codes›A00–B99›A50-A64›A57

ICD-10-CM A57
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A57 is a billable ICD-10-CM diagnosis code for chancroid. 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

ICD-10-CM Code
A57
Billable Status
Yes — Valid for Submission
Code Describes
Chancroid
Short Description
Chancroid
Same as the full description in the CMS dataset.
Chapter
A50-A64
Infections with a predominantly sexual mode of transmission

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA57Chancroid
This CodeA57Chancroid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chancroid
  • Chancroid - anogenital ulcer
  • Chancroid - extragenital ulcer
  • Chancroid - latent infection
  • Infective dermatosis of female genitalia
  • Penile chancroid
  • Vulval chancroid

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A57: 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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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.

  • Ulcus molle

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • nonspecific and nongonococcal urethritis (N34.1)
  • Reiter's disease (M02.3-)

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.

From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • human immunodeficiency virus [HIV] disease (B20)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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 A57, its category, or a range that includes it.

Applicable To 1

These notes mention A57.

  • O98.3 Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium
    Conditions in A55-A64 names A55-A64, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Chancroid

    acute, localized autoinoculable infectious disease usually acquired through sexual contact. caused by haemophilus ducreyi, it occurs endemically almost worldwide, especially in tropical and subtropical countries and more commonly in seaports and urban areas than in rural areas.

Patient EducationClinical

Sexually Transmitted Infections

Sexually transmitted infections (STIs) are infections that are passed from one person to another through sexual contact. If not treated, an STI can develop into a sexually transmitted disease (STD).

The full article covers:

  • What are sexually transmitted infections (STIs)?
  • What causes sexually transmitted infections (STIs)?
  • Who is affected by sexually transmitted infections (STIs)?
  • What are the symptoms of sexually transmitted infections (STIs)?
  • How are sexually transmitted infections (STIs) diagnosed?
  • What are the treatments for sexually transmitted infections (STIs)?
  • Can sexually transmitted infections (STIs) be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A57 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
099.0 Chancroid
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A57Overview

What is the ICD-10 code for chancroid?

The ICD-10-CM code for chancroid is A57. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A57 (Chancroid) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chancroid on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A57 group to?

When chancroid 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 A57 be reported with N34.1?

Not as a rule. The Excludes1 note at block A50-A64, which applies to A57, 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 A57?

Under the General Equivalence Mappings, chancroid converts to ICD-9-CM 099.0 (chancroid). The mapping is a direct match.