2026 ICD-10-CM Diagnosis Code B65.9Schistosomiasis, unspecified

ICD-10-CM Codes›A00–B99›B65-B83›B65

ICD-10-CM B65.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B65.9 is a billable ICD-10-CM diagnosis code for schistosomiasis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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 6 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B65.9
Billable Status
Yes — Valid for Submission
Code Describes
Schistosomiasis, unspecified
Short Description
Schistosomiasis, unspecified
Same as the full description in the CMS dataset.
Parent Code
B65
Schistosomiasis [bilharziasis]

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB65Schistosomiasis [bilharziasis]
This CodeB65.9Schistosomiasis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute schistosomiasis
  • Associated pulmonary arterial hypertension
  • Bleeding esophageal varices
  • Cardiopulmonary schistosomiasis
  • Cystitis with bilharziasis
  • Disease caused by Schistosomatidae
  • Disorder of urinary bladder caused by Schistosoma
  • Encephalitis caused by Schistosoma
  • Esophageal varices associated with another disorder
  • Esophageal varices with bleeding due to schistosomiasis
  • Glomerular disease due to infectious disease
  • Glomerular disease due to parasitic disease
  • Glomerular disorder due to infection caused by Schistosoma
  • Granuloma of brain caused by Schistosoma
  • Hepatic granuloma
  • Hepatic schistosomal granuloma
  • Hepatic schistosomiasis
  • Hepatosplenic schistosomiasis
  • Infection by Schistosoma
  • Infection of lower respiratory tract and mediastinum
  • Infection of spleen
  • Myelitis caused by Schistosoma
  • Neuroschistosomiasis
  • Nodule of liver
  • Parasitic infection causing myelitis
  • Periportal fibrosis
  • Periurethral abscess
  • Pneumonia caused by Schistosoma mansoni
  • Pneumonia due to parasitic infestation
  • Pulmonary arterial hypertension associated with schistosomiasis
  • Pulmonary schistosomiasis
  • Schistosoma encephalomyelitis
  • Schistosoma mansoni infection
  • Schistosomal granuloma of central nervous system
  • Schistosomal hepatomegaly
  • Schistosomal periurethral abscess
  • Schistosomal pigment deposition
  • Schistosomal splenomegaly
  • Schistosomal urethral fistula
  • Schistosomiasis of urethra
  • Splenic schistosomal giant cell lymphoma
  • Splenitis
  • Symmer's pipe-stem fibrosis
  • Urinary schistosomiasis

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

Clinical InformationClinical

  • Neuroschistosomiasis

    schistosomiasis of the brain, spinal cord, or meninges caused by infections with trematodes of the genus schistosoma (primarily schistosoma japonicum; schistosoma mansoni; and schistosoma haematobium in humans). s. japonicum infections of the nervous system may cause an acute meningoencephalitis or a chronic encephalopathy. s. mansoni and s. haematobium nervous system infections are associated with acute transverse myelitis involving the lower portions of the spinal cord. (from joynt, clinical neurology, 1998, ch27, pp61-2)

  • Schistosomiasis

    infection with flukes (trematodes) of the genus schistosoma. three species produce the most frequent clinical diseases: schistosoma haematobium (endemic in africa and the middle east), schistosoma mansoni (in egypt, northern and southern africa, some west indies islands, northern 2/3 of south america), and schistosoma japonicum (in japan, china, the philippines, celebes, thailand, laos). s. mansoni is often seen in puerto ricans living in the united states.

  • Schistosomiasis haematobia

    a human disease caused by the infection of parasitic worms schistosoma haematobium. it is endemic in africa and parts of the middle east. tissue damages most often occur in the urinary tract, specifically the urinary bladder.

  • Schistosomiasis japonica

    schistosomiasis caused by schistosoma japonicum. it is endemic in the asia, eastern and affects the bowel, liver, and spleen.

  • Schistosomiasis mansoni

    schistosomiasis caused by schistosoma mansoni. it is endemic in africa, the middle east, south america, and the caribbean and affects mainly the bowel, spleen, and liver.

  • Splenitis

    inflammation of the spleen.

  • Schistosoma Mansoni Infection

    an infection that is caused by schistosoma mansoni.

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 B65.9 to ICD-9-CMHistory

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

ICD-9-CM
120.9 Schistosomiasis NOS
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 B65.9Overview

What is the ICD-10 code for schistosomiasis, unspecified?

The ICD-10-CM code for schistosomiasis, unspecified is B65.9 (sometimes written as B659). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is B65.9 (Schistosomiasis [bilharziasis]) a billable code?

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

What MS-DRG does B65.9 group to?

When schistosomiasis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

Is B65.9 a CC or MCC?

CMS lists B65.9 as a CC (complication or comorbidity) for FY 2026. 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 6 closely related codes in its exclusion list.

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

Under the General Equivalence Mappings, schistosomiasis, unspecified converts to ICD-9-CM 120.9 (schistosomiasis NOS). The mapping is a direct match.