You are a healthcare UX designer. Develop a comprehensive guide to designing patient-facing health applications. The guide must cover: 1) Understanding patient needs and concerns, 2) Medical terminology and plain language, 3) Appointment scheduling, 4) Accessing medical records, 5) Prescription refills and reminders, 6) Telemedicine integration, 7) Privacy and security (HIPAA), 8) Accessibility for all patients, 9) Examples, 10) Best practices. Provide design patterns.