What must be documented in a patient's medical record during an encounter?

• A. History of present illness and social determinants only.
• B. Diagnosis and treatment plan only.
• C. Reason for the encounter, history, physical examination, diagnostic tests, results, diagnosis, and treatment plan.
• D. Appointment scheduling alone.

Answer: (C)

Documenting during a patient encounter should capture the purpose of the visit and the data and decisions stemming from it. The reason for the encounter anchors why the patient is there and guides coding. The history provides the patient’s subjective information and context, the physical examination records the objective findings, and any diagnostic tests and their results show what was investigated and what was found. The diagnosis or assessment ties all the data together into the clinical problem being addressed, and the treatment plan outlines the chosen management, prescriptions, referrals, patient instructions, and follow-up. Together, these elements create a complete, defendable record that supports medical necessity, continuity of care, and appropriate billing. The other options are incomplete because they omit essential components like the exam, test data, or the overall plan, or focus only on scheduling.