Z20Contact with and (suspected) exposure to communicable diseases

Z20 is the ICD-10-CM diagnosis code for contact with and (suspected) exposure to communicable diseases. It belongs to block Z20-Z29 (persons with potential health hazards related to communicable diseases) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z20.0 (diseases), Z20.1 (tuberculosis), Z20.2 (transmission), Z20.3 (rabies), Z20.4 (rubella), Z20.5 (hepatitis), Z20.6 ([HIV]), Z20.7 (infestations) and 2 more.

Don't report Z20 together with the conditions in its Excludes1 note: carrier of infectious disease (Z22.-) and diagnosed current infectious or parasitic disease -see Alphabetic Index.

The conditions in its Excludes2 note aren't part of Z20, but may be coded alongside it if the patient has both: personal history of infectious and parasitic diseases (Z86.1-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.