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. 2011 Mar;36(3):139–144.

Table 1.

Classification of Patients With Low Back Pain

Patients with low back pain were identified using International Classification of Diseases, Ninth Revision, Clinical Modification codes (ICD-9-CM) as follows:

  • Group I: back pain with no neurological findings (ICD-9-CM codes 724.2, 724.5, and 846.0–846.9)

  • Group II: back pain with neurological findings (ICD-9-CM codes 721.42, 721.91, 722.73, 722.80, 724.3, and 724.4)

  • Group IIIa: congenital lumbar spine structural disorders (ICD-9-CM codes 737.1, 737.20, 737.3, 739.3, 739.4, and 756.13–756.19)

  • Group IIIb: acquired lumbar spine structural disorders (ICD-9-CM codes 721.5–721.90, 722.10, 722.2, 722.30, 722.32, 722.52, 722.6, 722.90, 722.93, 724.00, 724.02, 724.09, 738.4, and 756.12)

  • Group IV: other (ICD-9-CM codes 307.89, 722.83, 724.6, 724.8, 724.9, 756.10, 805.4, 805.6, 805.8, and 996.4).