2027 ICD-10-CM Diagnosis Code B57.32Megacolon in Chagas' disease

ICD-10-CM Codes›A00–B99›B50-B64›B57

ICD-10-CM B57.32
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B57.32 is a billable ICD-10-CM diagnosis code for megacolon in Chagas' disease. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 69 closely related codes. Coders also document this condition as Chagas' disease with digestive system involvement. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders; and Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B57.32
Billable Status
Yes — Valid for Submission
Code Describes
Megacolon in Chagas' disease
Short Description
Megacolon in Chagas' disease
Same as the full description in the CMS dataset.
Parent Code
B57.3
Chagas' disease (chronic) with digestive system involvement

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB50-B64Protozoal diseases
CategoryB57Chagas' disease
This CodeB57.32Megacolon in Chagas' disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chagas' disease with digestive system involvement
  • Chronic Chagas' disease
  • Intestinal flagellate infection
  • Megacolon in Chagas' disease

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B57.32: its own notes plus those printed at B57, block B50-B64, 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 B57 Chagas' disease applies to 12 codes
  • American trypanosomiasis
  • infection due to Trypanosoma cruzi
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

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

From Block B50-B64 Protozoal diseases applies to 57 codes
  • amebiasis (A06.-)
  • other protozoal intestinal diseases (A07.-)

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 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 B57.32, its category, or a range that includes it.

Applicable To 1

These notes mention B57.32.

  • O98.6 Protozoal diseases complicating pregnancy, childbirth and the puerperium
    Conditions in B50-B64 names B50-B64, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming B57.32: they are not reported together with it, unless the two conditions are unrelated.

  • K59.3 Megacolon, not elsewhere classified
    megacolon (due to) (in) Chagas' disease (B57.32)

Code First 1

These codes say to code first a condition named in the note, and B57.32 is one of the conditions named.

  • F02 Dementia in other diseases classified elsewhere
    trypanosomiasis (B56.-, B57.-) names B57.-, 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 DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Chagas Disease

    infection with the protozoan parasite trypanosoma cruzi, a form of trypanosomiasis endemic in central and south america. it is named after the brazilian physician carlos chagas, who discovered the parasite. infection by the parasite (positive serologic result only) is distinguished from the clinical manifestations that develop years later, such as destruction of parasympathetic ganglia; chagas cardiomyopathy; and dysfunction of the esophagus or colon.

Patient EducationClinical

Chagas Disease

Chagas disease, or American trypanosomiasis, is an illness that can cause serious heart and stomach problems. It is caused by a parasite. Chagas disease is common in Latin America, especially in poor, rural areas. It can also be found in the United States, most often in people who were infected before they moved to the U.S.

The full article covers:

  • What is Chagas disease?
  • What causes Chagas disease?
  • Who is more likely to develop Chagas disease?
  • What are the symptoms of Chagas disease?
  • How is Chagas disease diagnosed?
  • What are the treatments for Chagas disease?
  • Can Chagas disease be prevented?

Read the full article at MedlinePlus

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

Convert B57.32 to ICD-9-CMHistory

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

ICD-9-CM
086.1 Chagas dis of oth organ
Approximate The match is approximate rather than exact.

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 B57.32Overview

What is the ICD-10 code for megacolon in Chagas' disease?

The ICD-10-CM code for megacolon in Chagas' disease is B57.32 (sometimes written as B5732). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is B57.32 (Chagas' disease (chronic) with digestive system involvement) a billable code?

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

What MS-DRG does B57.32 group to?

When megacolon in Chagas' disease is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

Is B57.32 a CC or MCC?

CMS lists B57.32 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 69 closely related codes in its exclusion list.

Can B57.32 be reported with a code from A06?

Not as a rule. The Excludes1 note at block B50-B64, which applies to B57.32, lists "amebiasis (A06.-)". 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).