The world of medicine has gone digital, and both doctors and patients are actively in the market for online health applications. Developers working in health-related fields may be creating programs that focus on patient care, practice administration, research, or diagnosis. The best medical API alternatives offer users the ability to get helpful data on a wide range of subjects quickly. After reviewing all the Medical APIs, we found these 11 APIs to be the very best and worth mentioning: Symptom Checker API, Chile-coronapi API, Endless Medical API, Cough API, BMI Calculator API, myHealthbox API, MAPI US API, Manage BGL API, Health API, Body Mass Index (BMI Calculator) API, Malnutrition API. These APIs are popular for their features such as general diagnoses, COVID-19 data from Chile, AI-assisted diagnosis, accurate BMI calculation, health product information, pharmaceutical data, real-time diabetes management, fast BMI calculation, and determining a child's malnutrition score.