the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
A code also note instructs that 2 codes may be required to fully describe a condition but the sequencing of the two codes is discretionary, depending on the severity of the conditions and the reason for the encounter.
For codes less than 6 characters that require a 7th character a placeholder X should be assigned for all characters less than 6. The 7th character must always be the 7th character of a code
Includes: | diseases generally recognized as communicable or transmissible |
Use additional code for any associated drug resistance (Z16) | |
Excludes1: | 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.-) | |
influenza and other acute respiratory infections (J00–J22) | |
Excludes2: | infectious and parasitic diseases specific to the perinatal period (P35–P39) |
This chapter contains the following blocks:
A00–A09 | Intestinal infectious diseases |
A15–A19 | Tuberculosis |
A20–A28 | Certain zoonotic bacterial diseases |
A30–A49 | Other bacterial diseases |
A50–A64 | Infections with a predominantly sexual mode of transmission |
A65–A69 | Other spirochetal diseases |
A70–A74 | Other diseases caused by chlamydiae |
A75–A79 | Rickettsioses |
A80–A89 | Viral infections of the central nervous system |
A90–A99 | Arthropod-borne viral fevers and viral hemorrhagic fevers |
B00–B09 | Viral infections characterized by skin and mucous membrane lesions |
B10 | Other human herpesviruses |
B15–B19 | Viral hepatitis |
B20 | Human immunodeficiency virus [HIV] disease |