M54.17

Radiculopathy, lumbosacral region

Radiculopathy in the lumbosacral region refers to a clinical condition where one or more nerve roots in the lower back (typically L1 through S3) are compressed, irritated, or inflamed. This mechanical or chemical insult disrupts normal nerve function, leading to a triad of neurological symptoms: dermatomal pain, sensory disturbances, and myotomal motor weakness. Often clinically synonymous with 'sciatica' when the sciatic nerve roots (L4-S3) are involved, lumbosacral radiculopathy is most frequently the result of intervertebral disc pathology or degenerative changes in the spine. The lumbosacral region is particularly susceptible to these issues due to the high mechanical loads and mobility requirements of the lower spine. Clinical management focuses on alleviating pressure on the nerve root through conservative measures like physical therapy and anti-inflammatory medications, or surgical decompression in cases of progressive neurological deficit or refractory pain.

Clinical Symptoms

  • Sharp, electric, or burning pain radiating from the low back into the buttock and down the leg (sciatica)
  • Paresthesia, including numbness, tingling, or 'pins and needles' in specific leg or foot distributions
  • Localized muscle weakness in the lower extremities (e.g., difficulty with toe-walking or heel-walking)
  • Diminished or absent deep tendon reflexes, particularly the patellar (L4) or Achilles (S1) reflexes
  • Positive Straight Leg Raise (SLR) or Lasègue's sign
  • Worsening of pain with maneuvers that increase intrathecal pressure, such as coughing, sneezing, or straining (Valsalva maneuver)
  • Decreased sensation to light touch or pinprick along a specific dermatome
  • Muscle atrophy in chronic or severe cases
  • Foot drop or gait abnormalities due to peroneal or tibial nerve root involvement

Common Causes

  • Herniated nucleus pulposus (intervertebral disc herniation) causing direct compression
  • Lumbar spinal stenosis (central or foraminal narrowing)
  • Degenerative disc disease with subsequent loss of disc height
  • Osteophyte formation (bone spurs) secondary to osteoarthritis of the facet joints
  • Spondylolisthesis (slippage of one vertebra over another)
  • Synovial cysts originating from the facet joints
  • Spinal trauma or fractures causing nerve root impingement
  • Space-occupying lesions such as primary or metastatic spinal tumors
  • Infectious processes, including discitis or spinal epidural abscess
  • Inflammatory conditions like diabetic amyotrophy or vasculitis

Documentation & Coding Tips

Specify the exact nerve root level involved to distinguish from generalized back pain.

Example: Patient presents with sharp, radiating pain originating in the lower back and extending down the lateral aspect of the left leg to the dorsal foot. Neurological examination reveals weakness in the left hallux extension (4/5) and diminished sensation in the L5 dermatome. MRI confirms L4-L5 disc extrusion with compression of the exiting left L5 nerve root. This documentation supports M54.17 by identifying specific anatomical involvement and laterality for accurate billing and risk adjustment.

Billing Focus: Identify the specific vertebral level (e.g., L4-L5) and the specific nerve root (e.g., L5) to justify medical necessity for imaging and specialized treatment.

Clearly document the clinical findings such as sensory or motor deficits associated with the radiculopathy.

Example: Clinical assessment of the lumbosacral region shows a positive straight leg raise test on the right at 30 degrees. Assessment of deep tendon reflexes indicates an absent right Achilles reflex (0/4), consistent with S1 radiculopathy. Patient also exhibits calf muscle atrophy. These clinical markers confirm the severity of the radiculopathy, which is essential for risk adjustment monitoring of chronic neurological decline.

Billing Focus: Use objective findings like reflex scores (0-4+) and muscle strength (0-5) to document the severity required for higher-level E/M coding.

Link the radiculopathy to an underlying cause such as spinal stenosis or disc herniation, but prioritize the radiculopathy code if it is the focus of the encounter.

Example: The patient is experiencing exacerbation of chronic lumbosacral radiculopathy due to worsening lumbar spinal stenosis at L3-L4 and L4-L5. Pain is refractory to conservative management. The treatment plan involves a transforaminal epidural steroid injection at the L4 level. Documentation links the structural cause to the symptomatic radiculopathy, supporting the medical necessity of the procedural intervention.

Billing Focus: Linking the radiculopathy to a structural diagnosis like stenosis (M48.061) or disc displacement (M51.26) provides a complete diagnostic picture for claims processing.

Indicate the laterality and the episode of care for any traumatic or acute-on-chronic presentations.

Example: Initial encounter for acute right-sided lumbosacral radiculopathy following a lifting injury two days ago. Patient reports parasthesia in the right S1 distribution. No prior history of spinal disorders. This documentation clearly establishes laterality (right) and the acute nature of the condition, distinguishing it from long-standing degenerative processes for billing clarity.

Billing Focus: Laterality (left, right, or bilateral) is a fundamental requirement for the M54.17 sub-category to avoid claim denials for lack of specificity.

Document functional impairments and the impact on activities of daily living (ADLs).

Example: Lumbosacral radiculopathy is currently limiting the patient's ambulation to less than 50 feet due to neurogenic claudication and leg weakness. Patient requires a rolling walker for stability. Pain is rated 8/10 during movement. This functional assessment justifies the intensive physical therapy and potential surgical consultation documented in the plan of care.

Billing Focus: Functional deficits support the use of physical therapy CPT codes and provide evidence for the medical necessity of durable medical equipment (DME).

Relevant CPT Codes

Related Diagnoses

Hierarchy