🦠 Chapter 1 · A00-B99
Infectious Diseases Diagnosis Codes
Infectious disease codes cover conditions caused by bacteria, viruses, fungi, and parasites. From common infections like strep throat to more complex conditions like HIV, these codes help your doctor document exactly what's causing your illness and track how well treatment is working.
About This Chapter
Chapter 1 of the ICD-10-CM classification covers certain infectious and parasitic diseases, spanning codes A00-B99. These codes are used by healthcare providers to document diagnoses in your electronic health record (EHR), on insurance claims, and on medical bills.
Why this matters: If you see a code starting with A on your medical bill or health records, it likely falls in this chapter. Understanding what chapter your code belongs to can help you make sense of your diagnosis and ask better questions at your next appointment.
Diagnosis Codes in This Chapter
Browse the 7 diagnosis codes we currently cover in this chapter. Select any code to read a plain-English explanation.