Table 3.

Number of Cancer Specialists Identified by Individual and Combined Data Sources by Specialty Type

				All Cancer Specialists	Hematology/ Oncology *	Surgical Oncology	Radiation Oncology	Gynecologic Oncology
Total number identified by combining datasets				19,753	13,151	1,450	4,827	1,047
Contribution from each data source(s)
	Medicare Claims†	UPIN Registry	AMA Masterfile
a	Yes	Yes	Yes	9,673	6,629	139	2,536	201
b	Yes	No	No	640	423	60	237	28
c	Yes	Yes	No	1,167	510	300	394	186
d	No	Yes	No	1,578	937	401	356	183
e	No	Yes	Yes	2,658	1,789	96	608	129
f	No	No	Yes	3,796	2,699	447	645	303
g	Yes	No	Yes	241	164	7	51	17

^*Hematology/oncology refers to the following medical specialties: hematology, hematology–oncology, or medical oncology.

^†For reference in results text describing Table 3.

UPIN, Unique Physician Identifier Number; AMA, American Medical Association.