Z20: Contact with and (suspected) exposure to communicable diseases
Codes under Z20 (Contact with and (suspected) exposure to communicable diseases). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| Z20.0 | Contact with and (suspected) exposure to intestinal infectious diseases | — |
| Z20.0 | Contact with and (suspected) exposure to intestinal infectious diseases | — |
| Z20.01 | Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli) | ✓ |
| Z20.01 | Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli) | ✓ |
| Z20.1 | Contact with and (suspected) exposure to tuberculosis | ✓ |
| Z20.1 | Contact with and (suspected) exposure to tuberculosis | ✓ |
| Z20.2 | Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission | ✓ |
| Z20.2 | Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmission | ✓ |
| Z20.3 | Contact with and (suspected) exposure to rabies | ✓ |
| Z20.3 | Contact with and (suspected) exposure to rabies | ✓ |
| Z20.4 | Contact with and (suspected) exposure to rubella | ✓ |
| Z20.4 | Contact with and (suspected) exposure to rubella | ✓ |
| Z20.5 | Contact with and (suspected) exposure to viral hepatitis | ✓ |
| Z20.5 | Contact with and (suspected) exposure to viral hepatitis | ✓ |
| Z20.6 | Contact with and (suspected) exposure to human immunodeficiency virus [HIV] | ✓ |
| Z20.6 | Contact with and (suspected) exposure to human immunodeficiency virus [HIV] | ✓ |
| Z20.7 | Contact with and (suspected) exposure to pediculosis, acariasis and other infestations | ✓ |
| Z20.7 | Contact with and (suspected) exposure to pediculosis, acariasis and other infestations | ✓ |
| Z20.8 | Contact with and (suspected) exposure to other communicable diseases | — |
| Z20.8 | Contact with and (suspected) exposure to other communicable diseases | — |
| Z20.09 | Contact with and (suspected) exposure to other intestinal infectious diseases | ✓ |
| Z20.09 | Contact with and (suspected) exposure to other intestinal infectious diseases | ✓ |
| Z20.9 | Contact with and (suspected) exposure to unspecified communicable disease | ✓ |
| Z20.9 | Contact with and (suspected) exposure to unspecified communicable disease | ✓ |
| Z20.81 | Contact with and (suspected) exposure to other bacterial communicable diseases | — |
| Z20.81 | Contact with and (suspected) exposure to other bacterial communicable diseases | — |
| Z20.82 | Contact with and (suspected) exposure to other viral communicable diseases | — |
| Z20.82 | Contact with and (suspected) exposure to other viral communicable diseases | — |
| Z20.89 | Contact with and (suspected) exposure to other communicable diseases | ✓ |
| Z20.89 | Contact with and (suspected) exposure to other communicable diseases | ✓ |
| Z20.810 | Contact with and (suspected) exposure to anthrax | ✓ |
| Z20.810 | Contact with and (suspected) exposure to anthrax | ✓ |
| Z20.811 | Contact with and (suspected) exposure to meningococcus | ✓ |
| Z20.811 | Contact with and (suspected) exposure to meningococcus | ✓ |
| Z20.818 | Contact with and (suspected) exposure to other bacterial communicable diseases | ✓ |
| Z20.818 | Contact with and (suspected) exposure to other bacterial communicable diseases | ✓ |
| Z20.820 | Contact with and (suspected) exposure to varicella | ✓ |
| Z20.820 | Contact with and (suspected) exposure to varicella | ✓ |
| Z20.821 | Contact with and (suspected) exposure to Zika virus | ✓ |
| Z20.821 | Contact with and (suspected) exposure to Zika virus | ✓ |
| Z20.822 | Contact with and (suspected) exposure to COVID-19 | ✓ |
| Z20.822 | Contact with and (suspected) exposure to COVID-19 | ✓ |
| Z20.828 | Contact with and (suspected) exposure to other viral communicable diseases | ✓ |
| Z20.828 | Contact with and (suspected) exposure to other viral communicable diseases | ✓ |
Frequently asked questions
What is ICD-10-CM code Z20?
Z20 is an ICD-10-CM category covering Contact with and (suspected) exposure to communicable diseases. It contains 44 more specific diagnosis codes, 36 of which are billable.
Is Z20 a billable code?
No — Z20 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example Z20.0 — Contact with and (suspected) exposure to intestinal infectious diseases). 36 of the 44 codes under Z20 are billable.
What codes fall under Z20?
Z20 includes Z20.0, Z20.0, Z20.01, Z20.01, Z20.1, plus 39 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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