1. Mary Jo Bowie MS, BS, AAS, RHIA, RHIT

2. Infectious and Parasitic Diseases
CHAPTER 6
Infectious and Parasitic Diseases

3. Infectious and Parasitic Diseases— Code Range A00-B99
Infectious and parasitic diseases are reported from Chapter 1 of ICD-10-CM.
Infectious diseases occur when a pathogen invades the body and causes disease.

4. Bacterial Infections
Bacteria are one-celled organisms that are named according to their shapes and arrangements.
Bacterial infections include:
Salmonella
E. coli
Streptococci
Mycobacterium tuberculosis

5. Bacterial Shapes
© Cengage Learning 2014

6. Fungal Infections
Fungi—Microscopic plant life that lacks chlorophyll and must have a source of matter for nutrition.
Common fungal infection:
Yeast infections
Molds

7. Parasites
Parasites are organisms that feed on other organisms to nourish themselves.
Common parasites include:
Protozoa
Helminths
Arthropods

8. Viral Infections Viruses are the smallest of infectious pathogens.
Common viral infections include:
Herpes zoster—shingles
Varicella—chickenpox
HIV—AIDS
Herpes simplex—genital herpes
RNA virus—German measles

9. Intestinal Infectious Diseases—A00-A09
This range of codes includes cholera,
shingellosis, and other bacterial infections.
Food poisoning and viral intestinal infections are also found here.
Common symptoms include: nausea, vomiting, anorexia, abdominal pain, fever, muscular aches, and malaise.

10. Tuberculosis- A15-A19
Tuberculosis is caused by Mycobacterium tuberculosis.
Reference the instructional notations found at the beginning of the section.
Symptoms include: fatigue, weakness, loss of appetite and weight, coughing, hemoptysis, night sweats, and increased temperature later in the day and evening.

11. Other Infectious Diseases
Certain Zoonotic Bacterial Disease—A20-A28
Other Bacterial Diseases—A30-A49
Infections with a Predominantly Sexual Mode of Transmission—A50-A64
Other Spirochetal Diseases—A65-A69

12. Additional Infectious Diseases
Other Diseases Caused by Chlamydiae—A70-A74
Richettsioses—A75- A79
Viral Infections of the Central Nervous System—A80-A89
Arthropod-Borne Viral Fevers and Viral Hemorrhagic Fevers—A90-A99

13. Viral Diseases
Viral Infections Characterized by Skin and Mucous Membrane Lesions—B00-B09
Other Human Herpesviruses—B10
Viral Hepatitis- B15-B19
Human Immunodeficiency Virus Disease—B20
Other Viral Diseases—B25-B34

14. Other Infectious Diseases
Mycoses—B35-B49
Protozoal Diseases—B50-B64
Helminthiases—B65-B83
Pediculosis, Acariasis, and Other Infestations—B85-B89
Sequelae of Infectious and Parasitic Diseases—B90-B94
Bacterial and Viral Infectious Agents—B95-B97
Other Infectious Diseases—B99

15. Key Points to Remember
Single, combination, and dual code assignment are used for coding in this chapter of ICD-10-CM.
An underlying condition/infection is sequenced first, followed by the manifestation code.
Coders should be cautious when reporting HIV cases and reference documentation prior to code assignment.

16. Key Points (cont.)
Reference the Official ICD-10-CM Coding Guidelines for chapter-specific guidelines on:
HIV infections
Infectious agents as the cause of diseases classified to other chapters
Infections resistant to antibiotics
Sepsis, severe sepsis, and septic shock

17. Key Points (cont.) Additional guidelines:
Methicillin resistant Staphylococcus aureus (MRSA) conditions

18. Select the correct code for:
Coding Practice
Select the correct code for:
Amebic liver abscess

19. Coding Practice Solution
Main term to reference in index:
Abscess
Modifying term:
Liver, then amebic
Code Assignment:
A06.4