Certain infectious and parasitic diseases
22 sections · 1,309 total codes · 1,068 billable
About Chapter A00-B99
ICD-10-CM Chapter A00-B99 covers certain infectious and parasitic diseases. The chapter contains 22 sections (code blocks) and 1,309 total codes - 1,068 are billable on a claim, the rest are non-billable headers used to organize the hierarchy.
Browse below by section, or jump straight to the most-billed codes in this chapter. Every code page includes Type 1/2 Excludes, Inclusion Terms, ICD-9 GEMs crosswalk, HCC mapping, LCD coverage, and payer-specific policies.
Most-Searched Diagnoses in This Chapter
Codes with the most LCD coverage, payer policies, and CPT linkages, proxies for what billers look up most.
All Sections in A00-B99
Each section is a code block (e.g. E08-E13 = Diabetes mellitus). Click a section to see all codes inside.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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