Nothing close enough? Start from a blank erd → Describe it in one paragraph.
How to use an erd template.
- 01Start with the Patient entity
Place the Patient entity at the center with attributes: patient_id, name, date_of_birth, contact_info, insurance_id. This is the primary entity most others relate to.
- 02Add Doctor and Staff entities
Create Doctor with attributes: doctor_id, name, specialty, license_number. Add a relationship connecting Doctors to Patients through Appointments.
- 03Model the Appointment entity
Create Appointment as a junction entity between Patient and Doctor, with appointment_date, time, type, status, and notes. This is the core scheduling relationship.
- 04Add Prescription and Diagnosis
Link Prescription (medication, dosage, duration) and Diagnosis (ICD code, description, date) to Appointment or Patient as appropriate for your system's requirements.
- 05Include Billing and Insurance
Add Billing linked to Appointment or Patient, with insurance claims, payment status, and payer information to complete the full clinical data model.
Questions about erd templates
What are the core entities in a healthcare database?
Core entities typically include: Patient, Doctor (or Provider), Appointment, Diagnosis, Prescription, Medication, Department, Insurance, and Billing. The exact set depends on whether the system is for a clinic, hospital, or pharmacy.
How do I model the patient-doctor relationship?
Patients typically have many doctors (specialists, primary care) and doctors have many patients — a many-to-many relationship. Use an Appointment or PatientProvider junction table to link them, as appointments carry the meaningful context.
Should prescriptions link to appointments or patients?
Best practice is linking prescriptions to both — they're issued during an appointment (appointment_id FK) and belong to a patient (patient_id FK). This allows querying by visit context and by patient history.
How do I represent ICD diagnosis codes in an ER diagram?
Create a Diagnosis entity with icd_code as primary or foreign key, linking to an ICD lookup table. Then link Diagnosis records to Appointment or Patient with date and severity attributes.
What HIPAA considerations affect healthcare database design?
HIPAA requires that PHI (Protected Health Information) be stored and accessed securely. In your schema, this means tracking access logs, encryption at rest, and careful separation of identifiable data from clinical data. ChatDiagram can show the data entities; consult a HIPAA compliance specialist for implementation controls.