DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

A00-B99 · FY2027

Chapter 1 Certain infectious and parasitic diseases (A00-B99)

Chapter 1 holds 167 categories in 22 blocks, with 1,068 billable codes in FY2027; none of them is new this year.

Blocks
22
Categories
167
Billable codes
1,068
New FY2027
0
Instructions
7

Blocks and categories

Chapter instructions

Includes

  • diseases generally recognized as communicable or transmissible

Excludes2

  • carrier or suspected carrier of infectious disease (Z22.-) Z22
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-) O98
  • infectious and parasitic diseases specific to the perinatal period (P35-P39) P35 P39
  • influenza and other acute respiratory infections (J00-J22) J00 J22

Use additional code

  • code to identify resistance to antimicrobial drugs (Z16.-) Z16