What some of the top hospitals, insurers, unions and health care groups spent lobbying Massachusetts lawmakers between 2007 and 2013:

1. Massachusetts Hospital Association: $4,751,767

2. Partner's Health Care: $4,483,976

3. Massachusetts Association of Health Plans: $4,289,017

4. Blue Cross Blue Shield of Massachusetts: $3,361,740

5. Massachusetts Nurses Association: $2,762,524

6. Harvard Pilgrim Health Care: $2,682,964

7. Tufts Associated Health: $2,599,319

8. Massachusetts Medical Society: $2,305,776

9. Children's Hospital: $2,165,709

10. Tenet Healthcare/Vanguard Health Systems: $2,113,136

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Source: Massachusetts Secretary of the Commonwealth's Office