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ICD-10-CM 2027 diagnosis code

B71.9Cestode infection, unspecified

✓ Billable / specific

B71.9 is a valid, billable ICD-10-CM code for cestode infection, unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Cestodiasis, ICD-10 code for Cestode infestation, ICD-10 code for Cestodes infestation, ICD-10 code for Tapeworm infestation.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About B71.9

B71.9 is the ICD-10-CM diagnosis code for cestode infection, unspecified. It belongs to category B71 (other cestode infections), block B65-B83 (helminthiases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within B71, choose B71.9 (Cestode infection, unspecified) only when documentation doesn't support a more specific option: Hymenolepiasis (B71.0), Dipylidiasis (B71.1) and other specified cestode infections (B71.8).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964) and DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 123.9 (cestode infection, unspecified).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Tapeworm (infection) NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to B71.9.

Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

8 entries

Terms in the official ICD-10-CM index that lead to B71.9.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 123.9Cestode infection, unspecifiedexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about B71.9

Is B71.9 billable?

Yes. B71.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can B71.9 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict B71.9 as a principal diagnosis.

Is B71.9 a CC or MCC?

No. B71.9 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does B71.9 group to?

B71.9 is used in the MS-DRG v44.0 logic for MS-DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC), MS-DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC) and MS-DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for B71.9?

The CMS General Equivalence Mappings map B71.9 to ICD-9-CM 123.9.