CPT® Code 90611

Smallpox and monkeypox vaccine, attenuated vaccinia virus, live, non-replicating, preservative free, 0.5 mL dosage, suspension, for subcutaneous use

The CPT® Code 90611 refers to a specific vaccine designed to provide active, long-term immunity against smallpox and monkeypox. This vaccine utilizes an attenuated form of the vaccinia virus, which is a live but non-replicating virus. The term "attenuated" indicates that the virus has been altered in such a way that it cannot cause disease in the recipient, yet it is still capable of stimulating the immune system to produce antibodies. The vaccine is preservative-free and is administered in a dosage of 0.5 mL as a suspension intended for subcutaneous use. Smallpox and monkeypox are both classified as orthopoxviruses, which are large, enveloped, double-stranded DNA viruses that primarily infect epidermal cells. Infection with these viruses can lead to characteristic pock lesions and systemic symptoms due to viremia, as the virus disseminates through the lymphatic system. While monkeypox typically presents with milder symptoms compared to smallpox, both diseases have the potential to be fatal. The vaccine's formulation allows for cross-protection against these orthopoxviruses, making it particularly important for adults who are at high risk of exposure. It is important to note that this code specifically reports the vaccine product itself and does not encompass the administration of the vaccine, which is a separate procedure.