Don't confuse users with customers.

• The user can be a patient and/or a caregiver, while the customer (the one who will pay for the solution and make it available to users) can be a healthcare establishment, a mutual insurance company or the health insurance company in the case of reimbursement.... It's therefore important to clarify the customer's interest in purchasing the solution.
• B2B: your customers are healthcare facilities and/or professionals
• or B2C: your customers are patients, beware, in France they're not necessarily used to paying for digital healthcare solutions

In healthcare, many projects are BtoBtoC and offered free of charge to patients by healthcare organizations.