In 2006, LEGO released 4 City Medical sets, all of these sets have been retired. For that year, the total price of all retail sets cost $84, today those sets are valued around $333, a growth of 297%.
Most valuable 2006 LEGO City Medical set
7892 Hospital $179.88
Highest growth 2006 City Medical set
7890 Ambulance +703.13%
4 sets

7890 Ambulance

Theme / Subtheme City / Medical
Year 2006
Pieces / Minifigs 118 / 1
Availability Retired
7890 LEGO City Ambulance
Retail $7.99
Value $64.17
Growth  +703.1%
Annual growth 13.2%

7892 Hospital

Theme / Subtheme City / Medical
Year 2006
Pieces / Minifigs 382 / 4
Availability Retired
7892 LEGO City Hospital
Retail $49.99
Value $179.88
Growth  +259.8%
Annual growth 8.1%

7902 Doctor's Car

Theme / Subtheme City / Medical
Year 2006
Pieces / Minifigs 66 / 1
Availability Retired
7902 LEGO City Doctor's Car
Retail $5.99
Value $34.38
Growth  +474.0%
Annual growth 8.8%

7903 Rescue Helicopter

Theme / Subtheme City / Medical
Year 2006
Pieces / Minifigs 249 / 3
Availability Retired
7903 LEGO City Rescue Helicopter
Retail $19.99
Value $55.00
Growth  +175.1%
Annual growth 4.8%