2026 ICD-10-CM Diagnosis Code A79.82Anaplasmosis [A. phagocytophilum]
ICD-10-CM Codes›A00–B99›A75-A79›A79
- Billable — Valid for Submission
- Not Chronic
A79.82 is a billable ICD-10-CM diagnosis code for anaplasmosis [A. phagocytophilum]. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Transfusion transmitted A. phagocytophilum
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.
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Anaplasmosis [A. phagocytophilum](transfusion transmitted)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Anaplasmosis
a disease usually in cattle caused by parasitization of the red blood cells by bacteria of the genus anaplasma.Anaplasma
a genus of gram-negative bacteria whose organisms are obligate parasites of vertebrates. species are transmitted by arthropod vectors with the host range limited to ruminants. anaplasma marginale is the most pathogenic species and is the causative agent of severe bovine anaplasmosis.Anaplasmosis
an infection that is caused by anaplasma phagocytophilum, which is transmitted to humans by infected ticks; it is characterized by fever, headache, chills, and myalgia.
Patient EducationClinical
Bacterial Infections
Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.
The full article covers:
- What are bacteria?
- How do bacterial infections spread?
- What are the treatments for bacterial infections?
- Can bacterial infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement A79.82 replaces the following previously assigned code(s):
- A77.49 - Other ehrlichiosis
Questions About A79.82Overview
Is A79.82 (Other specified rickettsioses) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anaplasmosis [A. phagocytophilum] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A79.82 group to?
When anaplasmosis [A. phagocytophilum] 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.
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.
