Table 15. The Fifty Most Frequent Combinations of Physicians Seen by Medicare Users, U.S., 1977.

Rank	Physician Combination	Number of Persons Using Physician Combination	Percent Distribution
	All possible combinations	11,934,000	100.0
	Fifty most frequent	7,732,200	64.8
1	GP only	1,330,200	11.2
2	IM only	1,199,300	10.1
3	IM w R	403,500	3.4
4	FP only	334,700	2.8
5	IM w OPH	333,900	2.8
6	M only	328,100	2.8
7	GS only	280,900	2.3
8	GP w R	280,400	2.3
9	GP w OPH	250,700	2.1
10	GP w IM	231,500	1.9
11	OPH only	202,900	1.7
12	R only	186,000	1.6
13	IM w GS	138,300	1.2
14	GP w IM w R	121,400	1.0
15	GP w GS	118,200	1.0
16	IM w OPH w R	99,800	0.8
17	GS w R	83,600	0.7
18	ORS only	83,300	0.7
19	CD only	82,400	0.7
20	GP w M	82,100	0.7
21	IM w R	81,400	0.7
22	IM w ORS	81,200	0.7
23	IM w GS w R	78,800	0.7
24	GP w FP	76,600	0.6
25	IM w U	72,600	0.6
26	IM w OLR	69,100	0.6
27	GP w IM w OPH	67,500	0.6
28	FP w R	67,100	0.6
29	FP w OPH	63,700	0.5
30	U only	63,100	0.5
31	R w M	54,400	0.4
32	GP w OPH w R	51,200	0.4
33	GP w ORS	50,100	0.4
34	GP w U	49,900	0.4
35	IM w ORS w R	49,500	0.4
36	OPH w M	47,300	0.4
37	GP w GS w R	46,700	0.4
38	GS w OPH	45,900	0.4
39	GP w OLR	45,500	0.4
40	FP w IM	41,800	0.3
41	OLR only	41,100	0.3
42	GP w IM w GS	38,500	0.3
43	IM w OLR w OPH	37,700	0.3
44	IM w U w R	37,000	0.3
45	IM w GS w A w R	36,200	0.3
46	IM w GS w OPH	35,700	0.3
47	IM w R w M	33,700	0.3
48	IM w GS w A	33,400	0.3
49	IM w CD	33,300	0.3
50	ORS w R	33,000	0.3

NOTE: Abbreviations used are: general practice (GP); family practice (FP); internal medicine (IM); cardiovascular disease (CD); general surgery (GS); otology, laryngology, rhinology (OLR); ophthalmology (OPH); orthopedic surgery (ORS); urology (U); anesthesiology (A); radiology (R); multispecialty group (M). w = with.