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2025 ICD-10-CM code A21.7

Generalized tularemia.

Use additional code to identify resistance to antimicrobial drugs (Z16.-). Certain localized infections should be coded to the body system involved, not to A21.7.

Medical necessity for treatment of generalized tularemia is established by the confirmed diagnosis of the infection, typically through laboratory testing. Treatment is necessary to prevent serious complications and potential fatality.

Diagnosis of generalized tularemia involves evaluating the patient's history, symptoms, and physical examination findings. Laboratory testing, such as blood cultures, serological tests, and PCR, may be necessary to confirm the diagnosis. Treatment typically involves antibiotic therapy.

In simple words: Generalized tularemia is a rare but serious bacterial infection that can affect many parts of the body. It's caused by the bacterium *Francisella tularensis*, which is typically spread through the bites of infected ticks, deer flies, or other insects, contact with infected animals like rabbits or rodents or by aerosols containing the organism. Symptoms can vary depending on how the infection is acquired but may include sudden fever, chills, headache, muscle aches, and exhaustion.Sores or ulcers may develop at the site of infection.

Generalized tularemia is a systemic infection caused by the bacterium *Francisella tularensis*. It can affect multiple organ systems simultaneously.

Example 1: A patient presents with sudden onset of fever, chills, headache, and muscle aches after being bitten by a tick while hiking.Further examination reveals swollen lymph nodes and a skin ulcer at the site of the tick bite. Laboratory tests confirm the presence of *Francisella tularensis*. The patient is diagnosed with generalized tularemia and started on appropriate antibiotic treatment., A laboratory worker develops fever, chills, and respiratory distress after accidentally inhaling *Francisella tularensis* while handling a contaminated specimen.Chest X-ray reveals pneumonia. The worker is diagnosed with generalized tularemia resulting from inhalation exposure., A hunter develops fever, abdominal pain, and diarrhea after handling and dressing a wild rabbit.Blood tests reveal infection with *Francisella tularensis*. The patient is diagnosed with generalized tularemia resulting from direct contact with an infected animal.

Documentation should include details of the patient's symptoms, exposure history (e.g., tick or insect bites, animal contact, laboratory exposure), physical examination findings (e.g., skin ulcers, lymphadenopathy, respiratory distress), and laboratory results confirming the presence of *Francisella tularensis*.

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