Yes, Carcino Embryonic Antigen (CEA), Cancer Marker blood test is covered under IT 80D benefit in India. This benefit allows you to claim a tax deduction on expenses incurred for preventive health check-ups, including Carcino Embryonic Antigen (CEA), Cancer Marker blood test. However, it is important to note that the amount of tax deduction may vary depending on the policy and the specific test conducted. It is always best to consult with a tax expert or the insurance provider for more information.