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

ICD-10-CM 2027 chapter 1 contains 22 code blocks with 1,068 billable codes.

Code blocks

BlockTitleBillable
A00-A09Intestinal infectious diseases79
A15-A19Tuberculosis51
A20-A28Certain zoonotic bacterial diseases47
A30-A49Other bacterial diseases115
A50-A64Infections with a predominantly sexual mode of transmission142
A65-A69Other spirochetal diseases28
A70-A74Other diseases caused by chlamydiae8
A75-A79Rickettsioses21
A80-A89Viral and prion infections of the central nervous system48
A90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers34
B00-B09Viral infections characterized by skin and mucous membrane lesions82
B10Other human herpesviruses (B10)5
B15-B19Viral hepatitis23
B20Human immunodeficiency virus [HIV] disease (B20)1
B25-B34Other viral diseases55
B35-B49Mycoses104
B50-B64Protozoal diseases57
B65-B83Helminthiases85
B85-B89Pediculosis, acariasis and other infestations23
B90-B94Sequelae of infectious and parasitic diseases12
B95-B97Bacterial and viral infectious agents46
B99Other infectious diseases (B99)2

Chapter notes

Includes:
  • diseases generally recognized as communicable or transmissible
Excludes2 (not included here):
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)
Use additional code:
  • code to identify resistance to antimicrobial drugs (Z16.-)