Which statement relates to care based on medical necessity?

The statement that care must not be influenced by extraneous factors aligns with the principle of medical necessity. In the context of physical therapy and healthcare in general, medical necessity refers to the need for treatment that is appropriate, reasonable, and provided for the purpose of preventing, diagnosing, or treating an illness or injury based on the patient's medical condition. It emphasizes that decisions about care should be based on the patient's health needs and the effectiveness of various treatments, rather than on unrelated influencing factors such as financial interests, personal biases, or convenience.

This principle ensures that each treatment is based on evidence and clinical judgment, focusing primarily on what is suitable and beneficial for the patient's health. Therefore, care informed by medical necessity adheres strictly to these clinical guidelines and evidence-based practices, prioritizing patient wellbeing and outcomes.

The other statements do not align with this principle, as they suggest that care can be influenced by factors unrelated to the patient’s health needs, which directly contradicts the idea of care established on medical necessity.