Is having a cervical spinal stenosis a valid reason to apply for disability?

Depends: Cervical spinal stenosis can be a valid reason to apply for disability if it is severe and causes disabling symptoms--like severe pain or weakness of the arms. The validity of it being a disabling diagnosis is stronger if all treatment options have been tried and failed.

Depends: Depends on how physically impaired your are & if that would qualify as a disability . Just having this image finding does not mean there is impairment unless it is causing clinical findings of myleopathy especially weakness or dexterity / balance issues or radicular pain with associated weakness or significant pain restricting you or requiring medication to control symptoms that then impairs.