Appendix 1.

Diagnostic Categories, Diagnoses and Codes

Category	Diagnosis	ICD-9 CODE	Raw n
Chronic primary pain (n = 11015)	Fibromyalgia, myositis, myofascial pain, neuralgia, muscle/musculoskeletal/neuromuscular	729.1	478
	Pain, generalized	780.96	154
	Chronic pain	338.29	319
	Chronic pain associated with psychosocial dysfunction	338.4	74
	Chronic pain due to trauma	338.21	3
Chronic neuropathic pain (162)	Peripheral neuropathic pain	355.71, 355.4	0
	Regional pain syndrome	355.9	148
	Regional pain syndrome type 1	337.20	5
	Regional pain syndrome type 1 lower limb	337.22	2
	Regional pain syndrome type 1 upper limb	337.21	4
	Regional pain syndrome type 1 specified site NEC	337.21	0
	Regional pain syndrome type 2 lower limb	355.71	1
	Regional pain syndrome type 2 upper limb	354.4	2
Chronic musculoskeletal pain (n = 11621)	Osteoarthrosis generalized multiple sites	715.09	220
	Osteoarthrosis shoulder	715.11	23
	Osteoarthrosis hand	715.14	10
	Osteoarthrosis hip	715.15	11
	Osteoarthrosis knee	715.16	16
	Osteoarthrosis ankle/foot	715.17	68
	Osteoarthrosis unspecified	715.9	3
	Other unspecified arthropathies	716	1111
	Internal derangement of kneeChondromalacia patella	717717.7	547
	Joint pain, unspecified	719.4	2938
	Spondylosis and allied disorders	721.0, 0.1,0.2,0.3,0.4	260
	Intervertebral disc disorders	722, 22.0,0.1,0.2,.4.5,0.51,0.52,0.6,0.7,0.8	683
	Other disorders of cervical region	723, 723.0,0.1,0.2,0.3,0.4,0.5	1009
	Other and unspecified disorders of back	724, 724.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7	2982
	Peripheral enthesopathies and allied syndromes	726, 0.0,0.1,0.12,0.3,0.31,0.32,0.33,0.4,0.5,0.6,0.61,0.64,0.65, 0.7,0.71,0.72,0.73	1160
	Other disorders of synovium, tendon, and bursa	727, 0.0,0.00,0.04,0.05,0.06,0.4,0.6,0.8,0.83,0.89	691
	Disorders of muscle, ligament, fascia	728.1,0.5,0.6,0.7,0.71,0.89	221
	Other disorders of soft tissues	729.0,0.1,0.2,0.5	1373

ICD-9, International Classification of Diseases, Ninth Revision; NEC, not elsewhere classifiable.