It is not easy to find sources of up to date health care data. This is out of date based on a 1995 US Government report. More current data is based on projections from that report.

Healthcare costs as % of GDP has tripled in my lifetime and seems poised to quadruple. Why?
1995 13.6%
1990 12.1%
1985 10.2%
1980   8.9%
1970   7.1%
1960   5.1%

Payers for heath care in America have been gradually changing from private to public sources.
                                 1995    1960
Out-of-Pocket         22.4%    50.0%
Private Insurance      31.4%    25%      
Federal & State        46.2%    25%

Costs for health care:
89% personal health services and supplies
  5% admin
  3% public health
  2% research
  1% construction

Breaking down the personal health services and supplies:
43% hospital care
23% physicians
  6% drugs
  3% other supplies
  9% nursing home expenses
  6% other professional care
  5% dental
  3% home health care
  3% other
  2% durable equipment

Looking more closely at physicians:
250 physicians for every 100k population in the US (750,000 total MD's)
1 physician for every 400 people in the population (incl 15% uninsured)
5-6 contacts per patient per year, 9-11 contacts for elderly patients
23% of $2.1 trillion means 750K physicians must gross $644,000 per year each

Medical spending by type:
Chronic 75%
Acute    25%

Medical costs by diagnositc area:
27.5% Circulatory
10.3% Respiratory
  8.7% Neoplasms (tumors)
  7.3% Digestive
  6.3% Musculoskeletal
  8.6% Injury/poison
30.0% Other (each 5% or less)

Administration Costs by Payer:
  2.0% Medicare/Medicaid
  9.5% Private Insurer
11.9% HMO
(does this include administration costs born by the service provider in trying to get paid?)

Impact of malpractice?
Impact of specific diseases/conditions?