Thank you for the opportunity to help you with your question!
market segmentation refers to a process of breaking down a larger target market in manageable groups of customers you can efficiently transact with.
product segmentation refers to a process where a company produces similar product with slight or minor variations to different market.
Market segmentation may also involve entail product differentiation, but the two are different as the market market segmentation in healthcare may involve offering different prices or services to different people in different regions, but product differentiation is the same product possessing varying characteristics. Product differentiation entails distinguishing or making some improvements in your medicines and health facilities while Market segmentation in healthcare is dividing health services quality in different places.
Please let me know if you need any clarification. I'm always happy to answer your questions.