ICD-9 Diagnosis Code 020.4

Secondary pneumon plague

Diagnosis Code 020.4

ICD-9: 020.4
Short Description: Secondary pneumon plague
Long Description: Secondary pneumonic plague
This is the 2014 version of the ICD-9-CM diagnosis code 020.4

Code Classification
  • Infectious and parasitic diseases
    • Zoonotic bacterial diseases (020-027)
      • 020 Plague

Information for Patients


Also called: Bubonic plague, Pneumonic plague

Plague is an infection caused by the bacterium Yersinia pestis. The bacteria are found mainly in rats and in the fleas that feed on them. People and other animals can get plague from rat or flea bites. In the past, plague destroyed entire civilizations. Today plague is uncommon, due to better living conditions and antibiotics.

There are three forms of plague:

  • Bubonic plague causes the tonsils, adenoids, spleen, and thymus to become inflamed. Symptoms include fever, aches, chills, and tender lymph glands.
  • In septicemic plague, bacteria multiply in the blood. It causes fever, chills, shock, and bleeding under the skin or other organs.
  • Pneumonic plague is the most serious form. Bacteria enter the lungs and cause pneumonia. People with the infection can spread this form to others. This type could be a bioterror agent.

Lab tests can diagnose plague. Treatment is a strong antibiotic. There is no vaccine.

NIH: National Institute of Allergy and Infectious Diseases

  • Plague

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