| Document And Entity Information | Nov. 08, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 08, 2023 |
| Entity Registrant Name | Coya Therapeutics, Inc. |
| Entity Central Index Key | 0001835022 |
| Entity Emerging Growth Company | true |
| Securities Act File Number | 001-41583 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 85-4017781 |
| Entity Address, Address Line One | 5850 San Felipe St., Suite 500 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77057 |
| City Area Code | 800 |
| Local Phone Number | 587-8170 |
| Entity Information, Former Legal or Registered Name | N/A |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | COYA |
| Security Exchange Name | NASDAQ |
