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. Author manuscript; available in PMC: 2015 Feb 2.
Published in final edited form as: Ophthalmic Epidemiol. 2012 Oct;19(5):257–264. doi: 10.3109/09286586.2012.698692

Table 4. Characteristics of 3,446,418 Cataract Surgeries in United States billed through Medicare in 2003-2004.

# of Surgeons % of Surgeons # of Surgeries % of Surgeries
Overall 11,938 100 3,446,418 100
Surgical Setting
 ASCa 5,684b N/a 1,734,098 50.3
 Hospital 9,309b N/a 1,634,166 47.4
 Unknownc 78,154 2.3
Surgeon Annual Cataract Surgery Volume
 1-50 4,608 38.6 144,561 4.2
 51-200 4,529 37.9 1,021,987 29.7
 201-500 2,253 18.9 1,361,252 39.5
 501-1000 451 3.8 594,997 17.3
 1001+d 97 0.8 286,461 8.3
 Unknowne 37,160 1.1
Surgeon Years of Experience as of 2004
 0-10 years 1,857 15.6 287,638 8.4
 11-20 years 3,529 29.6 1,113,713 32.3
 21-30 years 3,544 29.7 1,228,284 35.6
 31+ years 2,902 24.3 774,771 22.5
 Unknowne 106 0.9 42,012 1.2
a

ASC=Ambulatory Surgery Center

b

Some surgeons operate in both ASCs and hospitals, and they appear in both totals.

c

Some service locations were inaccurate.

d

The 97 very high volume surgeons had a mean annual surgical volume of 1477 (median=1255; range 1010-6485).

e

These surgeries only had an ASC facility claim and could not be linked to the surgeon or surgeon upins were not valid or were for new physicians without an assigned upin (e.g, ‘EXE000,’ ‘NEW000’).