Increased personal services and foreign representation are crucial, particularly with modifier 24 for procedures performed within a specific timeframe. Services must be evidence-based according to U.S. preventive guidelines, identifiable by adding code 33 for preventive measures. Certain services may be partially reduced at the physician's discretion due to patient circumstances or procedural challenges like in colonoscopies. Additionally, physicians can terminate surgeries if they pose risks during post-operative periods.