Table 4.

Percentage of Allowed Charges Attributed to Primary Care Providers, by Disease and Year^*

	All	Outpatient
2012
Diabetes	59.8%	70.5%
Chronic Heart Failure	48.9%	56.4%
Chronic Obstructive Pulmonary Disease	58.4%	62.2%
Cancer	4.5%	8.8%
Inflammatory Bowel Disease	18.6%	30.4%
Rheumatoid Arthritis	14.1%	19.8%
2013
Diabetes	57.7%	69.5%
Chronic Heart Failure	48.4%	54.7%
Chronic Obstructive Pulmonary Disease	58.1%	61.3%
Cancer	4.7%	9.4%
Inflammatory Bowel Disease	18.2%	30.7%
Rheumatoid Arthritis	13.2%	19.3%

^*This analysis used the 20% Part B Medicare carrier office and outpatient hospital claims files with a place of service code of 11 or 22. Primary care providers have specialty codes of internal medicine, family medicine, general practice, and geriatrics. Specialty providers are all non-primary care physician specialties; we excluded allied health providers such as nurse practitioners and physician assistants.