Z20 — Contact with and (suspected) exposure to communicable diseases

Not billable

Is Z20 billable?

No — Z20 is a non-billable header code. Z20 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath Z20.

Billable codes under this header

Z20 at a glance

Code	Z20
Description	Contact with and (suspected) exposure to communicable diseases
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together

The conditions below can never be reported together with Z20 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

carrier of infectious disease (Z22.-)
diagnosed current infectious or parasitic disease -see Alphabetic Index

Excludes2 — not included here

The conditions below are not part of Z20, but a patient may have both at the same time. When documentation supports it, Z20 and the excluded code may both be reported.

personal history of infectious and parasitic diseases (Z86.1-)

What codes fall under Z20? (10)

How long has Z20 existed?

Z20 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.