This paper provides a comprehensive review of recent advances in generative AI in healthcare, particularly focusing on diffusion models and transformer architectures. It covers innovative applications of generative AI across diverse healthcare domains, including medical imaging, protein structure prediction, clinical documentation, diagnostic support, radiology interpretation, clinical decision support, medical coding and billing, drug design, and molecular expression. It analyzes how these technologies have contributed to improving clinical diagnosis, data reconstruction, and drug synthesis. It serves as a reference and guide for both researchers and practitioners, offering a comprehensive perspective on the current state of the art, its impact on healthcare, and its future potential.