Table 3 Variation in the frequency of ICD-9 codes for patients with claims-based recurrent mechanical LBP in 2000 and 2007

722.1

1.4%

2.0%

+0.6%

11%

722.2

(5 270)

(5 825)

(555)

722.7

721.3

18.5%

17.2%

−1.3%

−18%

721.5-8

(70 162)

(57 764)

(-12 398)

721.9

722.5

722.6

722.9

721.4

1.9%

3.8%

+1.9%

43%

724.0

(7 250)

(12 765)

(5 515)

724.6

0.2%

0.1%

−0.1%

−37%

(655)

(415)

(-240)

724.2

66.9%

65.1%

−1.8%

−14%

724.5

(254 385)

(218 228)

(-36 157)

722.8

0.0%

0.1%

+0.1%

2 650%

(8)

(212)

(204)

722.3

11.2%

11.7%

+0.5%

+8%

724.3-4

(42 422)

(39 224)

(3 198)

724.8-9

739.3-4