2026 ICD-10-CM Diagnosis Code B53.1Malaria due to simian plasmodia
ICD-10-CM Codes›A00–B99›B50-B64›B53
- Billable — Valid for Submission
- Not Chronic
B53.1 is a billable ICD-10-CM diagnosis code for malaria due to simian plasmodia. 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. Coders also document this condition as malaria caused by simian plasmodia. 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.
- Malaria caused by simian plasmodia
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- Malaria due to simian plasmodia with Plasmodium falciparum B50
- Malaria due to simian plasmodia with Plasmodium malariae B52
- Malaria due to simian plasmodia with Plasmodium ovale B53.0
- Malaria due to simian plasmodia with Plasmodium vivax B51
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Malaria, malarial (fever) - B54
- simian - B53.1
- Monkey malaria - B53.1
- Simian malaria - B53.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Malaria, malarial(fever)
- Plasmodium (P.)
- simian
- Monkey malaria
- Simian malaria
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Malaria
Malaria is a serious disease caused by a parasite. You get it when an infected mosquito bites you. Malaria is a major cause of death worldwide, but it is almost wiped out in the United States. The disease is mostly a problem in developing countries with warm climates. If you travel to these countries, you are at risk.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert B53.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About B53.1Overview
Is B53.1 (Other specified malaria) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malaria due to simian plasmodia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does B53.1 group to?
When malaria due to simian plasmodia 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.
What is the ICD-9 equivalent of B53.1?
Under the General Equivalence Mappings, malaria due to simian plasmodia converts to ICD-9-CM 084.4 (malaria NEC). The mapping is approximate, so confirm the match fits the documentation.
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.
