2026 ICD-10-CM Diagnosis Code B65.1Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]

ICD-10-CM Codes›A00–B99›B65-B83›B65

ICD-10-CM B65.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B65.1 is a billable ICD-10-CM diagnosis code for schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 441 through 443. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B65.1
Billable Status
Yes — Valid for Submission
Code Describes
Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]
Short Description
Schistosomiasis due to Schistosoma mansoni
Parent Code
B65
Schistosomiasis [bilharziasis]

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB65Schistosomiasis [bilharziasis]
This CodeB65.1Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Encephalitis caused by Schistosoma
  • Encephalitis caused by Schistosoma mansoni
  • Granuloma of brain caused by Schistosoma mansoni
  • Hepatic schistosomiasis
  • Infection of liver and spleen caused by Schistosoma mansoni
  • Infection of spleen
  • Intestinal schistosomiasis
  • Myelitis caused by Schistosoma
  • Myelitis caused by Schistosoma mansoni
  • Parasitic infection causing myelitis
  • Schistosoma mansoni infection
  • Splenitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • bilharziasis
    • Bilharziasis
      • intestinal
    • Disease, diseased
      • Manson's
    • Dysentery, dysenteric(catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)
      • schistosomal
    • Egyptian splenomegaly
    • Infestation
      • Schistosoma
        • mansoni
    • Manson's
      • disease
    • Manson's
      • schistosomiasis
    • Schistosomiasis
      • colon
    • Schistosomiasis
      • due to
        • S. mansoni
    • Schistosomiasis
      • intestinal
    • Schistosomiasis
      • Manson's (intestinal)
    • Schistosomiasis
      • Schistosoma
        • mansoni
    • Splenomegaly, splenomegalia(Bengal) (cryptogenic) (idiopathic) (tropical)
      • Egyptian

Clinical ClassificationClinical

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

CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Schistosoma Mansoni Infection

    an infection that is caused by schistosoma mansoni.

  • Splenitis

    inflammation of the spleen.

Patient EducationClinical

Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Read the full article at MedlinePlus

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

Convert B65.1 to ICD-9-CMHistory

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

ICD-9-CM
120.1 Schistosoma mansoni
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B65.1Overview

Is B65.1 (Schistosomiasis [bilharziasis]) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B65.1 group to?

When schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 441, 442, 443, with relative weights from 0.6997 to 1.7947 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B65.1?

Under the General Equivalence Mappings, schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis] converts to ICD-9-CM 120.1 (schistosoma mansoni). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.