The Optum 2025 Coding bundle includes textbooks on ICD-10 CM/PCS, HCPCS Level II & Coders Desk References, focusing on medical coding and billing. Written in English, this advanced-level resource is designed for adult education and further education in the field of medical coding. Authored by Optum, this textbook covers key subjects in Allied Health Services, making it a valuable tool for students and professionals in the medical coding field.