This paper presents MediGen, a large-scale language model (LLM) that automatically generates medical reports based on medical conversations to alleviate the excessive administrative burden on physicians. Developed by fine-tuning LLaMA3-8B, MediGen achieves high accuracy (ROUGE score: 58%, BERTScore-F1: 72%) in transcribing and summarizing medical conversations, demonstrating its potential to reduce physicians' administrative workload and improve healthcare efficiency and physician well-being.