ICD-10 Z20
Non-Billable HeaderContact with and (suspected) exposure to communicable diseases
About ICD-10-CM Z20
ICD-10-CM code Z20 represents Contact with and (suspected) exposure to communicable diseases. This is a non-billable header code in the Factors Influencing Health Status chapter (block Z20). The 2026 edition of ICD-10-CM Z20 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 1 Excludes
Pure excludes, these codes can never be coded together with Z20. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- carrier of infectious disease (Z22.-)
- diagnosed current infectious or parasitic disease -see Alphabetic Index
Type 2 Excludes
Not included here, the excluded code is not part of Z20, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- personal history of infectious and parasitic diseases (Z86.1-)
Medicare LCD Coverage for Z20
Local Coverage Determinations (LCDs) from CMS MACs that list Z20 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Z20.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but Z20 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with Z20
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To Z20
Other codes in section Z20-Z29 (Persons with potential health hazards related to communicable diseases).
ICD-10 Z20, Billing FAQ
Is ICD-10 code Z20 billable? +
No, Z20 is a non-billable header code. Use a more specific child code from block Z20 when submitting claims.
What codes are Type 1 Excludes for Z20? +
Type 1 Excludes (never code together with Z20): carrier of infectious disease (Z22.-); diagnosed current infectious or parasitic disease -see Alphabetic Index
What codes are Type 2 Excludes for Z20? +
Type 2 Excludes (may be coded together when both conditions exist): personal history of infectious and parasitic diseases (Z86.1-)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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