2026 ICD-10-CM Diagnosis Code B71.9Cestode infection, unspecified

ICD-10-CM Codes›A00–B99›B65-B83›B71

ICD-10-CM B71.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B71.9 is a billable ICD-10-CM diagnosis code for cestode infection, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 371 through 373. Coders also document this condition as cestode infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B71.9
Billable Status
Yes — Valid for Submission
Code Describes
Cestode infection, unspecified
Short Description
Cestode infection, unspecified
Same as the full description in the CMS dataset.
Parent Code
B71
Other cestode infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB71Other cestode infections
This CodeB71.9Cestode infection, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cestode infection
  • Cestode myositis
  • Dermatosis caused by tapeworm
  • Infection by tapeworm larvae
  • Parasitic myositis

Tabular List NotesGuidance

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

Inclusion Terms

  • Tapeworm (infection) NOS

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.

    • Cestode infestation
    • Cestodiasis
    • Disease, diseased
      • brain
        • parasitic NEC
    • Disease, diseased
      • parasitic
        • cerebral NEC
    • Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)
      • parasitic NOS
    • Epilepsy, epileptic, epilepsia(attack) (cerebral) (convulsion) (fit) (seizure)
      • parasitic NOS
    • Infestation
      • cestodes
    • Infestation
      • tapeworm

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

  • Cestode Infections

    infections with true tapeworms of the helminth subclass cestoda.

  • Cestoda

    a subclass of segmented worms comprising the tapeworms.

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 B71.9 to ICD-9-CMHistory

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

ICD-9-CM
123.9 Cestode infection 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 B71.9Overview

Is B71.9 (Other cestode infections) a billable code?

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

What MS-DRG does B71.9 group to?

When cestode infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 371, 372, 373, with relative weights from 0.7274 to 1.7731 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B71.9?

Under the General Equivalence Mappings, cestode infection, unspecified converts to ICD-9-CM 123.9 (cestode infection NOS). 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.