EXAMPLE ERD
Create and ERD using UML notation using the following rules:
• A PATIENT can make many APPOINTMENTS with one or
more DOCTORS in the clinic, and a doctor can accept
appointments with many patients. However, each
appointment is made with only one doctor, and each
appointment references a single patient.
• If kept, an appointment yields a VISIT with the doctor
specified in the appointment. The visit yields a diagnosis
and, when appropriate, TREATMENT.
• With each visit, the patient’s records are updated to
provide a medical history.
• Each patient visit creates a BILL. Each patient visit is billed
by one doctor, and each doctor can bill many patients.
• Each bill must be paid. However, a bill may be paid in many
installments, and payment may cover more than one bill.
• A patient may pay the bill directly, or the bill may be the
basis for a claim submitted for INSURANCE.
PATIENT
PAT_ID (PK)
1..1 make 1..*
1..1
DOCTOR
APPOINTMENT
0..*
APP_ID (PK)
PAT_ID (FK)
accept 1..1
DOC_ID (PK)
DOC_ID (FK)
0..*
yield
1..1
1..1
0..1
VISIT
VISIT_ID (PK)
APP_ID (FK)
DOC_ID (FK)
PAT_ID (FK)
DIAGNOSIS
1..1
create
1..1
BILL PAYMENT
BILL
BILL_ID (PK) (FK)
PAY_ID (PK) (FK)
BILL_ID (PK)
TREATMENT
BILL_ID (FK)
1..1 paid in
0..*
1..*
pays
TREAT_ID (PK)
VISIT_ID (FK)
VISIT_ID (FK)
DOC_ID (FK)
PAT_ID (FK)
1..1
0..*
INSURANCE
0..1 link 1..1
INS_ID (PK)
PAYMENT
PAY_ID (PK)
PAT_ID (PK) (FK)
INS_ID (FK)