A patient who is able to walk.

Able to walk. / Designed for use by somebody with a disability that impairs, but does not prevent, walking.

walking

simple past tense and past participle of ambulate

(intransitive) To walk; to relocate oneself under the power of one's own legs.

Third-person singular simple present indicative form of ambulate

(pathology) A disorder involving walking.

Use a telephone to ensure arrival of an ambulance

An aircraft (especially a form of helicopter) equipped as an ambulance

plural of air ambulance