ICD-10-CM Diagnosis Code A20.2: Pneumonic plague

A20.2 is a billable and specific ICD-10-CM code. Accurate documentation of A20.2 facilitates proper diagnosis, effective management, and correct reimbursement.

This guideline will provide the use, official coding guidelines, and historical background of A20.2.

What is the ICD-10-CM Diagnosis Code for Pneumonic plague?

The ICD-10-CM diagnosis code for Pneumonic plague is A20.2.

Plague is a serious infectious disease caused by the bacterium Yersinia pestis. It spreads through infected fleas, animals, or droplets from sick people.

Pneumonic plague is a severe lung infection caused by Yersinia pestis. It spreads through infected droplets from coughing or sneezing.

Symptoms appear quickly and include high fever, chills, cough with bloody mucus, chest pain, and difficulty breathing.

It is the most dangerous form of plague and can spread from person to person. Diagnosis is made through chest X-rays and lab tests.

Treatment includes strong antibiotics, oxygen support, and fluids. Early treatment is life-saving and helps stop the spread.

Proper documentation using A20.2 ensures patients receive appropriate care and enables accurate healthcare reimbursement.

History Background of ICD-10-CM Diagnosis Code A20.2

The ICD-9-CM system, first introduced in 1979, provided the initial framework for coding diseases and health-related conditions in the United States.

The ICD-9-CM diagnosis code for Pneumonic plague was:

2015 ICD-9-CM 020.3:Primary pneumonic plague
2015 ICD-9-CM 020.4: Secondary pneumonic plague
2015 ICD-9-CM 020.5: Pneumonic plague, unspecified

This coding remained consistent from 1979 to 2015.

While the ICD-9-CM system offered a basic approach to disease classification, modern healthcare needs more detail and specificity.

To address this, the ICD-10-CM system was launched in 2015, introducing a more comprehensive and accurate coding structure.

The transition from ICD-9-CM to ICD-10-CM significantly improved the ability to document and analyze conditions such as Pneumonic plague.

The 2025 edition of ICD-10-CM A20.2 became effective on October 1, 2024.

Year	ICD-10-CM Code	Description
2020	A20.2	No Change
2021	A20.2	No Change
2022	A20.2	No Change
2023	A20.2	No Change
2024	A20.2	No Change
2025	A20.2	No Change

Other ICD-10-CM Diagnosis Codes in A20

ICD-10-CM code A20 | Plague has following sub categories including A20.2 :

A20 Respiratory tuberculosis.
A20.0 Bubonic plague.
A20.1 Cellulocutaneous plague.
A20.2 Pneumonic plague.
A20.3 Plague meningitis.
A20.7 Septicemic plague.
A20.8 Other forms of plague.
A20.9 Plague, unspecified.

Final Thought

Proper coding of A20.2 is essential for diagnosing and managing Pneumonic plague. A clear understanding of its History, and correct usage enhances medical documentation and ensures effective treatment, patient care, supports healthcare planning, and guarantees proper reimbursement for medical services.

Dr. Sehrish Bano, CPB & CPC

As a certified professional in both billing and coding, I specialize in streamlining healthcare revenue cycles and ensuring accurate claim submissions. With more than five years of experience serving the healthcare industry in the USA, I bring expertise in coding accuracy, compliance, and reimbursement optimization. My work focuses on reducing errors, improving efficiency, and supporting providers in delivering quality care without administrative hurdles. I am committed to helping healthcare organizations achieve financial stability and compliance through reliable billing and coding practices.