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HES Data Dictionary

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HES field name Region of treatment
Field rotreat
Class Geographical
Length and format 3an
Availability
Description
Region of treatment (contains the Regional Health Authority of treatment prior to 1 April 2025). This derived field is extracted from the hospital provider code (procode). It defines the Regional Office (RO) where the treatment took place.
Value

From 1 April 1999:
Y01 = Northern and Yorkshire
Y02 = Trent
Y07 = West Midlands
Y08 = North West
Y09 = Eastern
Y10 = London
Y11 = South East
Y12 = South West
Y = Not Known

From 1 April 2025 to 31 March 1999:
Y01 = Northern and Yorkshire
Y02 = Trent
Y03 = Anglia and Oxford
Y04 = North Thames
Y05 = South Thames
Y06 = South and West
Y07 = West Midlands
Y08 = North West
Y = Not Known

From 1 April 2025 to 31 March 1996:
Y0A = Northern RHA
Y0B = Yorkshire RHA
Y0C = Trent RHA
Y0D = East Anglian RHA
Y0E = North West Thames RHA
Y0F = North East Thames RHA
Y0G = South East Thames RHA
Y0H = South West Thames RHA
Y0J = Wessex RHA
Y0K = Oxford RHA
Y0L = South Western RHA
Y0M = West Midlands RHA
Y0N = Mersey RHA
Y0P = North Western RHA
Y0Y = Not known

Data cleaning
Not applicable (derived by rule 1145)

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