2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B71.9 is a billable ICD-10-CM diagnosis code for cestode infection, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B71.9: its own notes plus those printed at 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 Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Tapeworm (infection) NOS

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 B71.9, its category, or a range that includes it.

Applicable To 1

These notes mention B71.9.

  • B81.4 Mixed intestinal helminthiases
    Infection due to intestinal helminths classified to more than one of the categories B65.0-B81.3 and B81.8 names B65.0-B81.3, which includes this code

Code First 1

These codes say to code first a condition named in the note, and B71.9 is one of the conditions named.

  • K67 Disorders of peritoneum in infectious diseases classified elsewhere
    helminthiasis (B65.0 -B83.9) names B65.0 -B83.9, 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 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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B71.9Overview

What is the ICD-10 code for cestode infection, unspecified?

The ICD-10-CM code for cestode infection, unspecified is B71.9 (sometimes written as B719). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 372, 371, 373, with relative weights from 0.6945 to 1.7087 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.