What is cpt codes 99432 and 99435 99431?

99431 - Physician office or other outpatient visit for the evaluation and management of an established patient, that typically requires a medically appropriate history and/or physical examination, and decision-making of low complexity. Using problem-focused interval history; 10 minutes

99432 - Physician office or other outpatient visit for the evaluation and management of an established patient, that typically requires a medically appropriate history and/or physical examination, and decision-making of moderate complexity. Using problem-focused interval history; 15 minutes

99435 - Physician office or other outpatient visit for the evaluation and management of an established patient, that typically requires a medically appropriate history and/or physical examination, and decision-making of high complexity. Using problem-focused interval history; 25 minutes