Do I need a referral letter to see a specialist? Public specialist outpatient clinics, private specialists and insurance compared
To book a new appointment at a Hospital Authority specialist outpatient clinic, you need a referral letter issued by a locally registered doctor within three months; one written by a private doctor is also accepted. For a private specialist, you can ask the hospital or clinic directly how to book; whether insurance needs a referral letter is governed by the policy terms.
When do I need a referral letter?
| Situation | Is a referral letter needed? | Points to note |
|---|---|---|
| New case at a Hospital Authority specialist outpatient clinic | Yes | Issued by a locally registered doctor, with an issue date within three months |
| Outpatient visit at a private hospital or specialist clinic | As arranged by the clinic | You can ask the hospital or clinic directly |
| Medical insurance claim | Depends on the policy | Whether outpatient visits are covered and whether a referral is needed are governed by the policy terms |
| Set fees at a private hospital for patients referred by the Hospital Authority | A Hospital Authority referral letter is needed | For example, the CUHK Medical Centre Cardiology Centre requires the original Hospital Authority referral letter to be shown |
How do I book a new appointment at a public specialist outpatient clinic?
Specialist outpatient clinics mainly treat patients referred by Family Medicine Clinics, private doctors or family doctors.
To book a new appointment you need a referral letter issued by a locally registered doctor within three months; for some specialties you can submit an application through ‘BookHA’ in HA Go; which specialties are available is as shown in the app.
Referred cases are usually first assessed by a nurse and then reviewed by a specialist, and classified as urgent, semi-urgent or stable. The Hospital Authority's target is to keep the median waiting time for urgent and semi-urgent new cases within two weeks and eight weeks respectively.
If your condition gets worse while you wait, you can contact the clinic to ask for an earlier appointment; in an emergency, go to the Accident and Emergency Department.
What should I look out for if I use insurance?
Taking the Voluntary Health Insurance Scheme Standard Plan as an example, outpatient cover is mainly for outpatient visits directly related to the illness or injury before and after a hospital stay or day surgery, and for specialist outpatient visits during specified non-surgical cancer treatment, with limits on the number of visits and the amount; the insurer can ask for written proof such as a referral letter.
Outpatient cover and referral requirements differ under other policies, such as company group medical insurance. Before seeing a doctor, you can ask the insurer: whether specialist outpatient visits are covered, whether a referral letter is needed, which claim documents are required, and whether the clinic can bill the insurer directly.
Common misconceptions
‘The referral letter must be written by a public-sector doctor’: no. To book a new appointment at a Hospital Authority specialist outpatient clinic, a referral letter issued by a locally registered doctor is enough, and one written by a private doctor is also accepted.
‘With a referral letter I will see a specialist quickly’: not necessarily. The Hospital Authority classifies cases as urgent, semi-urgent or stable by condition, and two weeks and eight weeks are the targets for the median waiting time of urgent and semi-urgent new cases; our analysis of Hospital Authority data published through DATA.GOV.HK: from October 2025 to September 2026, the median waiting time for stable new cases was longer than eight weeks in every cluster for all eight specialties (10 to 70 weeks).
‘The Voluntary Health Insurance Scheme always pays for outpatient visits’: no. Taking the Standard Plan as an example, outpatient cover is mainly limited to situations such as related outpatient visits before and after a hospital stay or day surgery, with limits on the number of visits and the amount.
Frequently asked questions
How long is a referral letter for a public specialist outpatient clinic valid?
To book a new appointment at a Hospital Authority specialist outpatient clinic, the referral letter must be issued by a locally registered doctor, with an issue date within three months.
Can a referral letter written by a private doctor be used to book a public specialist outpatient clinic?
Yes. What is required is a referral letter issued by a locally registered doctor; it does not have to be a public-sector doctor.
Can I book a new appointment at a public specialist clinic on my phone?
For some specialties, you can submit a new-case application through ‘BookHA’ in HA Go, the Hospital Authority's mobile app; the specialties you can apply for are as shown in the app.
Do I always need a referral letter for an insurance claim?
It depends on the policy. Taking the Voluntary Health Insurance Scheme Standard Plan as an example, the insurer can ask for written proof such as a referral letter; for other policies, the terms and the insurer's explanation apply.