2026 ICD-10-CM Diagnosis Code B65.3Cercarial dermatitis

ICD-10-CM Codes›A00–B99›B65-B83›B65

ICD-10-CM B65.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B65.3 is a billable ICD-10-CM diagnosis code for cercarial dermatitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin; and Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B65.3
Billable Status
Yes — Valid for Submission
Code Describes
Cercarial dermatitis
Short Description
Cercarial dermatitis
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 CodeB65.3Cercarial dermatitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cercarial dermatitis of freshwater avian type
  • Cercarial dermatitis of freshwater mammalian type
  • Cercarial dermatitis of sea water avian type
  • Cutaneous fluke infection
  • Cutaneous schistosomiasis
  • Dermatosis caused by Coelenterata
  • Infection by Trichobilharzia
  • Sea bather's eruption
  • Trichobilharzia cercarial dermatitis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Swimmer's itch

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.

    • Bilharziasis
      • cutaneous
    • Clam digger's itch
    • Dermatitis(eczematous)
      • cercarial
    • Dermatitis(eczematous)
      • schistosome
    • Infestation
      • Schistosoma
        • cercariae
    • Itch, itching
      • clam digger's
    • Itch, itching
      • swimmer's
    • Schistosomiasis
      • cutaneous
    • Swimmer's
      • itch

Clinical ClassificationClinical

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

CCSR SKN002
Other specified inflammatory condition of skin
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Cutaneous Schistosomiasis

    an unusual presentation of schistosomiasis characterized by a pruritic papular rash in the perigenital or periumbilical area due to an allergic reaction to schistosoma eggs deposited in the skin.

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 B65.3 to ICD-9-CMHistory

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

ICD-9-CM
120.3 Cutaneous schistosoma
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 B65.3Overview

Is B65.3 (Schistosomiasis [bilharziasis]) a billable code?

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

What MS-DRG does B65.3 group to?

When cercarial dermatitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B65.3?

Under the General Equivalence Mappings, cercarial dermatitis converts to ICD-9-CM 120.3 (cutaneous schistosoma). 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.