Table 1.

Use of endoscopy in 2000–2005 by sample cohort of well-insured persons (cohort aged 65+ in the year 2000, followed through 2005)

State	Sample size in state	Proportion with any use in 2000–2002	Proportion with any use in 2003–2005 but not 2000–2002	Proportion with any use in both periods	Proportion with any use in 2000–2005
CA	86,843	0.31	0.23	0.14	0.47
CT	23,402	0.36	0.27	0.17	0.53
GA	10,316	0.37	0.26	0.17	0.53
IA	22,799	0.38	0.24	0.19	0.53
KY	18,203	0.32	0.23	0.15	0.47
LA	15,717	0.29	0.23	0.14	0.46
MI	25,692	0.37	0.25	0.19	0.53
NJ	35,378	0.33	0.23	0.17	0.48
NM	7,439	0.30	0.21	0.14	0.45
UT	8,777	0.34	0.26	0.15	0.51
WA	17,511	0.34	0.26	0.15	0.51

We used the following codes on Medicare claims to identify endoscopy use: CPT codes: 44388–44397, 45300–45392; HCPCS codes: G0104, G0105, G0121; and ICD-9-CM codes: 45.22–45.25, 45.41–45.43, 48.22–48.24, 48.36 We used ICD-9-CM codes 555.x and 556.x listed on the Medicare claims to identify persons with IBD