Final answer:
The appropriate level of examination for the patient in question is Level 4 (99213) based on her symptoms and medical history.
Step-by-step explanation:
The patient in question is a 67-year-old female with controlled diabetes mellitus, who is complaining of lack of sensation in her feet. Given her medical history and symptoms, the appropriate level of examination would be Level 4 (99213). This is because the patient's complaint of lack of sensation in her feet is a significant symptom that requires a detailed examination and further evaluation.