| Verified against primary record | |
| Defined by complexity | Advanced, technically demanding care at medical centres, often university-affiliated, for severe, intricate or rare conditions[1] |
|---|---|
| Defined by referral route | A facility offering subspecialty expertise to patients referred from centres where they first received secondary care[2] |
| Defined by legal designation | In the Republic of Korea, ministerial designation against four cumulative statutory requirements, reviewed every three years[3] |
| Independently reported | |
| English practice | England does not use the term in commissioning. Its highest-complexity category is "specialised services", qualifying on patient numbers, cost and number of possible providers[4] |
| Bands apply only to the rows beneath them. The first two rows are drawn from two records in the same controlled vocabulary and define the term on different axes; neither is a statutory definition. | |
Tertiary care is highly specialised care for conditions that ordinary hospital services cannot manage. It is the tier most often invoked in medical travel marketing, and the one whose definition depends most on who is asked: the same term is defined by complexity, by referral route, and by legal designation, and the three do not coincide.
Three axes, one word
The tension is visible inside a single vocabulary. The United States National Library of Medicine maintains a descriptor for Tertiary Health Care, whose scope note turns on complexity and institutional type: advanced, technically demanding care delivered at medical centres, often university-affiliated, for patients with severe, intricate or rare conditions.[1] It also maintains a separate descriptor for Tertiary Care Centers, whose scope note turns instead on the referral route: a facility offering a high level of subspecialty expertise to patients referred from other centres where they first received secondary care.[2] One defines the care, the other the building, and they use different tests.
The third axis is legal. Article 3-4 of the Republic of Korea’s Medical Service Act empowers the Minister of Health and Welfare to designate a general hospital providing highly specialised care for serious diseases as a tertiary hospital, on four cumulative requirements: at least twenty specialised departments set by ministerial decree, each with dedicated specialists; status as a training institution for medical specialists; human resources, facilities and equipment set by decree; and compliance with standards for patient distribution across diagnosis-related groups. Designation is reviewed every three years and may be revoked.[3] That is the clearest answer available to the question of who decides what counts as tertiary, and the answer is specific to one country.
England declines the vocabulary
England designates its highest-complexity care without using the word. NHS England describes specialised services as supporting people with rare and complex conditions, with qualification turning on how many people need the service, what it costs and how many providers can deliver it; the page records 150 specialised services and spend of 25 billion pounds in 2023/24, and uses neither "tertiary" nor "quaternary".[4] The manual that implements this sets out the ministerial criteria as three factors, the number of individuals who need the service, the cost of providing it and the number of people able to provide it, and uses the word tertiary only incidentally, without defining it.[5]
Other systems substitute numbered capability levels. New South Wales grades each clinical service from no planned service through six ascending levels, with level six the highest complexity and often a referral centre with a cross-district role; the guide establishes no primary, secondary, tertiary ladder and uses those words only descriptively.[6] This matters for anyone comparing hospitals across borders, because numbered systems do not all run in the same direction.
The criticism from inside medicine
A Canadian Medical Association Journal editorial argues that tertiary is a defensible label for a hospital or a specialty centre but meaningless applied to an individual patient’s care; that care does not always ascend the levels, since severe trauma and transplant needs may require specialist attention first, making a strictly sequential model unsafe; that the definition rests on the judgement of those providing the care and carries funding and prestige consequences; and that levels-of-care classification serves payers and managers more than clinicians.[7] That is the most useful caution available for a reader comparing a "tertiary hospital" abroad with one at home.
What crosses borders at this level
Europe organises its highest-complexity cross-border care through named networks rather than tiers. The European Commission records 24 European Reference Networks created under Directive 2011/24/EU, spanning 1,606 specialised centres in 375 hospitals across 27 member states and Norway as of October 2025, addressing rare, low-prevalence and complex conditions requiring highly specialised healthcare; patients cannot approach a network directly, because a healthcare provider consults it with the patient’s consent.[8] Neither "tertiary" nor "quaternary" appears.
The volumes involved are small and are frequently conflated with commercial medical travel. The European Court of Auditors reported that about 200,000 patients a year use the cross-border healthcare Directive, under 0.05 per cent of European Union citizens and about 0.004 per cent of annual healthcare expenditure, against roughly two million claims a year under the social security coordination Regulation, with prior authorisation applying in about one per cent of cases.[9] Directive-based cross-border care and commercially purchased treatment abroad are different populations and should not be added together.
See also
- Secondary Care, the level from which tertiary referrals are supposed to originate
- Quaternary Care, a further tier with no authoritative published definition
- Medical Travel for Rare Diseases, the patient group European Reference Networks were created for
- Medical Tourism Clusters, on why co-located specialist capacity is not the same as a defined tier
References
- United States National Library of Medicine. Medical Subject Headings descriptor Tertiary Health Care (D063128). Introduced 2013. Verified against primary record: the descriptor record was opened and its scope note, tree numbers and entry terms read. Retrieved 10 October 2026.
- United States National Library of Medicine. Medical Subject Headings descriptor Tertiary Care Centers (D062606). Introduced 2013. Verified against primary record: the descriptor record was opened and its scope note and entry terms read and compared with D063128. Retrieved 10 October 2026.
- Republic of Korea. Medical Service Act, Article 3-4 (Designation of Tertiary Hospitals). English translation, Korea Legislation Research Institute; most recent amendment Act No. 19818, 31 October 2023; Article 3-4 inserted 30 January 2009. Verified against primary record: the article text was opened and its four requirements and review period read. Retrieved 10 October 2026.
- NHS England. Specialised services. Figures cited for 2023/24. Verified against primary record: the page was opened and read, and checked for the terms tertiary and quaternary. Retrieved 10 October 2026.
- NHS England. Prescribed Specialised Services Manual, version 6. Publication reference PRN00115, 22 March 2023. Verified against primary record: the manual PDF was opened and the ministerial criteria read. Retrieved 10 October 2026.
- NSW Ministry of Health. NSW Health Guide to the Role Delineation of Clinical Services, Seventh Edition. Dated 23 February 2026 on the document; the publisher’s landing page describes Version 7 published 4 May 2026. Verified against primary record: the guide was opened and its level definitions read. Retrieved 10 October 2026.
- Flegel K. Tertiary hospitals must provide general care. Canadian Medical Association Journal 2015;187(4):235. 3 March 2015. Verified against primary record: the editorial was opened and read. Retrieved 10 October 2026.
- European Commission. European Reference Networks: overview. Membership figures as of October 2025. Verified against primary record: the page was opened and the network, centre and hospital counts and the access route read. Retrieved 10 October 2026.
- European Court of Auditors. Special Report 7/2019: EU actions for cross-border healthcare. Adopted 10 April 2019. Verified against primary record: the report was opened and the patient volumes, expenditure shares and prior-authorisation proportions read. Retrieved 10 October 2026.
Sourcing note: the Korean designation criteria are reported from an official English translation published by the Korea Legislation Research Institute rather than from the Korean-language statute. The NSW role delineation guide carries a different edition date on the document than on its publisher’s landing page, and both are given above. No WHO glossary definition of tertiary care was located; the term is used in WHO’s primary health care glossary without being defined there.