2026 ICD-10-CM Diagnosis Code B56.1Rhodesiense trypanosomiasis
ICD-10-CM Codes›A00–B99›B50-B64›B56
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B56.1 is a billable ICD-10-CM diagnosis code for rhodesiense trypanosomiasis. 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 69 closely related codes. Coders also document this condition as african trypanosomiasis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- African trypanosomiasis
- Encephalitis caused by Trypanosoma brucei
- Encephalitis caused by Trypanosoma brucei rhodesiense
- Infection by Trypanosoma rhodesiense
- Meningitis caused by Trypanosoma brucei
- Trypanosoma brucei rhodesiense meningitis
- Trypanosomiasis with encephalitis
- Trypanosomiasis with meningitis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- East African sleeping sickness
- Infection due to Trypanosoma brucei rhodesiense
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
rhodesian B56.1
rhodesiense B56.1
East African B56.1
Rhodesian B56.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 B56.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B56.1Overview
What is the ICD-10 code for rhodesiense trypanosomiasis?
The ICD-10-CM code for rhodesiense trypanosomiasis is B56.1 (sometimes written as B561). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is B56.1 (African trypanosomiasis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rhodesiense trypanosomiasis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does B56.1 group to?
When rhodesiense trypanosomiasis 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 B56.1 a CC or MCC?
CMS lists B56.1 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 69 closely related codes in its exclusion list.
What is the ICD-9 equivalent of B56.1?
Under the General Equivalence Mappings, rhodesiense trypanosomiasis converts to ICD-9-CM 086.4 (rhodesian trypanosomias). The mapping is a direct match.
