Table 2.

Percent of Enrollees With Claims Data for LDCT and All CTs in 2010, 2015, 2016, for all Medicare Enrollees Aged 55 to 77 and for Enrollees With Smoking Diagnoses

Year	LDCT		Any chest CT
	All enrollees (95% CI)	Those with smoking diagnostic codes (95% CI)	All enrollees (95% CI)	Those with smoking diagnostic codes (95% CI)
2010	0%	0%	7.38% (7.35%-7.41%)	20.38% (20.24%-20.52%)
2015	0.09% (0.08%-0.09%)	0.49% (0.47%-0.51%)	7.59% (7.56%-7.61%)	20.61% (20.51%-20.71%)
2016	0.44% (0.43%-0.45%)	2.21% (2.18%-2.25%)	8.32% (8.29%-8.35%)	21.82% (21.73%-21.91%)

Denominator is all enrollees with complete Part A&B in 2010, 2015, or 2016 and not enrolled in HMOs in that year.

CI = confidence interval; CT = computed tomography; LDCT = low-dose computed tomography