Codes used in this analysis of AORC are based on the National Arthritis Data Workgroup ICD-9-CM diagnostic codes for arthritis and other rheumatic conditions.1  [[Link does not work -- please advise.]]

Osteoarthritis and Allied Disorders:
    Osteoarthritis and allied disorders: 715
Rheumatoid Arthritis
    Rheumatoid arthritis and other inflammatory polyarthropathies: 714
Gout and Other Crystal Arthropathies:
   Gout: 274
   Crystal arthropathies: 712
Joint Pain, Effusion and Other Unspecified Joint Disorders
    Other unspecified arthropathies: 716.1, 716.3-716.6-716.9
    Other and unspecified joint disorders: 719.0, 719.4-719.9
Spondylarthropathies:
    AS/inflammatory spondylopathies: 720
    Spondylosis and allied disorders: 721
    Reiter’s disease: 99.3
    Psoriatic arthopathy: 696.0
Fibromyalgia:
   Myalgia and myositis unspecified: 729.1
Diffuse Connective Tissue Disease
   Diffuse connective tissue disease: 710 [excl 710.0-.2]
   Sicca syndrome (also called Sjögren's syndrome): 710.2
   Systemic sclerosis (SSC, scleroderma): 710.1
   Systemic lupus erythematosus (SLE): 710.0
Carpal Tunnel Syndrome:
   Carpal tunnel syndrome: 354.0
Soft Tissue Disorders (excluding back):
    Peripheral enthesopathies and allied disorders: 726
    Other disorders of synovium/tendon/bursa: 727
    Disorders of muscle/ligament/fascia: 728.0-728.3, 728.6-728.0
    Rheumatism, unspecified and fibrositis: 729.0
    Fascitis, unspecified: 729.4
Other Specified Rheumatic Conditions:
    Syphilis of muscle: 95.6
    Syphilis of synovium/tendon/bursa: 95.7
    Gonococcal infection of joint: 98.5
    Behcet’s syndrome: 136.1
    Other disorders purine/pyrimidine metabolism: 277.2
    Allergic purpura: 287.0
    Cauda equina syndrome: 344.6
    Brachial plexus/thoracic outlet lesions:353.0
    Tarsal tunnel syndrome: 355.5
    Polyneuropathy in collagen vascular disease: 357.1
    Rheumatic fever w/o heart disease: 390
    Rheumatic fever w/heart disease: 391
    Cerebral arteritis: 437.4
    Raynaud’s syndrome: 443.0
    Polyarteritis nodosa and allied conditions: 446 [excl 446.5]
    Arteritis, unspecified: 447.6
    Arthritis associated with infections: 711
    Arthropathy associated w/disorders classified elsewhere: 713
    Specified arthropathies: 716.0, 716.2-716.8
    Specified joint disorders: 719.2, 719.3
    Polymyalgia rheumatica: 725

• 1. Centers for Disease Control and Prevention, Arthritis Program, National Arthritis Data Workgroup. http://www.cdc.gov/arthritis/data_statistics/pdf/arthritis_codes_2004.pdf [1]. Accessed October 29, 2013.