ICD-10-CM Diagnosis Code A08.31:Calicivirus enteritis

A08.31 is a billable and specific ICD-10-CM code. Accurate documentation of A08.31 facilitates proper diagnosis, effective management, and correct reimbursement.

This guideline will provide the use, official coding guidelines, and historical background of A08.31.

What is the ICD-10-CM Diagnosis Code for Calicivirus enteritis?

The ICD-10-CM diagnosis code for Calicivirus enteritis is A08.31.

Calicivirus enteritis is a gastrointestinal infection caused by caliciviruses, including noroviruses and sapoviruses.

These viruses spread easily through contaminated food, water, surfaces, or close contact with infected people.

Common symptoms include sudden onset of diarrhea, vomiting, stomach cramps, nausea, and sometimes fever.

The illness is usually short-lived but can be severe in young children, older adults, or people with weak immune systems.

Treatment focuses on rest, hydration, and managing symptoms, as there is no specific antiviral medicine. Prevention includes good hand hygiene and safe food practices.

Proper documentation using A08.31 ensures patients receive appropriate care and enables accurate healthcare reimbursement.

Synonyms

History Background of ICD-10-CM Diagnosis Code A08.31

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 Calicivirus enteritis is 008.65.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 Calicivirus enteritis.

The 2025 edition of ICD-10-CM A08.31 became effective on October 1, 2024.

Year	ICD-10-CM Code	Description
2020	A08.31	No Change
2021	A08.31	No Change
2022	A08.31	No Change
2023	A08.31	No Change
2024	A08.31	No Change
2025	A08.31	No Change

Other ICD-10-CM Diagnosis Codes in A08

ICD-10-CM code A08 | Viral and other specified intestinal infections has following sub categories including A08.31 :

A08.0 Rotaviral enteritis.
A08.1 Acute gastroenteropathy due to Norwalk agent and other small round viruses.
A08.11 Acute gastroenteropathy due to Norwalk agent.
A08.19 Acute gastroenteropathy due to other small round viruses.
A08.2 Adenoviral enteritis.
A08.3 Other viral enteritis.
A08.31 Calicivirus enteritis.
A08.32 Astrovirus enteritis.
A08.39 Other viral enteritis.
A08.4 Viral intestinal infection, unspecified.
A08.8 Other specified intestinal infections.

Final Thought

Proper coding of A08.31 is essential for diagnosing and managing Calicivirus enteritis. 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.