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Table 7 Coding system used to define LBP. Codes have been separated into three LBP categories: Non-specific, Mechanical and Non-Mechanical LBP. Two classes of LBP (urgent and non-urgent) were defined based on these categories. Corresponding ICD-9 codes are presented below

From: Current management practices for patients presenting with low back pain to a large emergency department in Canada

Non-Urgent (Non-Specific LBP and LBP with neurological signs or symptoms) Urgent (Pathologic cause LBP)
Non-Specific LBP LBP with neurological signs or symptoms Pathologic cause LBP
•Backache
•Back Sprain or Strain
• Unspecified Back Disorder
• Compression Spinal Fracture
• Degenerative Disc Disease
• Disc Herniation
• Discogenic
• Scoliosis
• Spinal Stenosis
• Spondilolisthesis
• Spondylosis
• Unspecified Disc Disorders
• Abdominal pain.
• Aortic Aneurysm
• Cancer
• Fracture of vertebral column
• Headache / Migraine
• Myalgia
• Neuritis / Radiculitis
• Pneumonia
• Pancreatitis
• Pyelonephritis
• Renal Colic
• Sciatica/ radiculopathy
• Superficial Injury
• Urinary Tract Infection
ICD-9:
• 724 Unspecified back disorder
• 724.2 Non specific etiologies (eg Lumbago)
• 724.5 Backache, unspecified
• 724.8 Other symptoms referable to back.
• 729 other disorders of soft tissues
• 846.9 Unspecified
• 847 Sprain /strain back
• 847.2 lumbar
• 847.9 unspecified
• 848 other and ill-defined sprains and strains.
• 848.9 unspecified site.
• 959 injury, other and un- specified.
• 959.1 trunk injury.
• 959.29 other site on trunk.
• 721.3 Spondylosis
• 722 Intervertebral disc disorder
• 722.1 Displacement of thoracic or lumbar intervertebral disc without myelopathy
• 722.2 Displacement of intervertebral disc, site unspecified, without myelopathy
• 722.52 Degenerative disc disease
• 722.93 Other and unspecified disc disorder (Lumbar)
• 724.0 Spinal Stenosis
• 733.13 Compression fracture, not due to trauma.
• 846 Sacroiliac sprains/strains
• 846.0 Lumbosacral joint or ligament
• 140–239 Neoplasms
• 346 Migraine
• 441 Aortic Aneurysm
• 486 Pneumonia
• 577 Pancreatitis
• 590.8 Pyelonephritis
• 599 Urinary Tract Infection
• 724.3 Sciatica
• 724.4 Thoracic or lumbosacral neuritis/radiculitis
• 729.1 Myalgia and myositis
• 729.5 Pain in limb
• 788 Renal Colic
• 789 Abdominal Pain
• 805 Fracture of vertebral column without mention of spinal cord Injury
• 919 Superficial Injury