M62.830

Muscle spasm of back

Muscle spasm of the back refers to the sudden, involuntary, and often painful contraction or twitching of one or more muscles in the posterior trunk. These spasms frequently involve the paraspinal muscles, the trapezius, or the latissimus dorsi. Clinical presentation often involves a protective mechanism known as 'splinting,' where the body involuntarily contracts muscles to stabilize an injured area, such as a herniated disc or strained ligament. While often acute and self-limiting, these spasms can be symptomatic of chronic degenerative conditions of the spine or systemic issues like electrolyte imbalances. The severity ranges from a dull ache and stiffness to sharp, debilitating pain that restricts all trunk movement.

Clinical Symptoms

  • Sudden, sharp pain in the back
  • Persistent dull ache or stiffness in the lumbar or thoracic region
  • Palpable tightness or a 'knot' in the back muscles
  • Difficulty standing upright or maintaining posture
  • Restricted range of motion in the spine
  • Sensation of the back 'locking up'
  • Increased pain with movement or twisting
  • Localized muscle tenderness

Common Causes

  • Acute muscle strain or ligamentous sprain
  • Underlying spinal conditions such as herniated nucleus pulposus
  • Degenerative disc disease (DDD) or spinal osteoarthritis
  • Poor posture or prolonged sedentary positioning
  • Electrolyte imbalances (hypomagnesemia, hypocalcemia, or hypokalemia)
  • Dehydration
  • Heavy lifting or improper lifting technique
  • Sudden twisting or traumatic injury
  • Psychological stress and physical tension

Documentation & Coding Tips

Distinguish between muscle spasm and muscle strain to ensure proper code selection.

Example: Patient reports sudden onset of involuntary contractions in the paraspinal muscles after heavy lifting. Physical exam confirms palpable taut bands and localized tenderness in the lumbar region without evidence of acute fiber tearing or ecchymosis. Diagnosis: Acute muscle spasm of the lumbar back (M62.830). Billing focus: Site specificity of the lumbar region. Risk adjustment: Documentation of acute functional limitation and the absence of traumatic strain (S39.012A) clarifies the primary pathology as musculoskeletal dysfunction.

Billing Focus: Site specificity (lumbar vs. thoracic) and clinical nature (spasm vs. strain).

Document the anatomical location of the spasm with high precision.

Example: Clinical evaluation reveals persistent muscle spasms of the thoracic back (M62.830) affecting the rhomboid and trapezius muscle groups. The patient exhibits restricted range of motion in the mid-spine. Billing focus: Anatomical region (thoracic). Risk adjustment: Highlighting the involvement of multiple muscle groups supports medical necessity for physical therapy and manual manipulation codes.

Billing Focus: Anatomical location within the back (cervical, thoracic, or lumbar).

Identify and document any associated underlying spinal conditions while maintaining spasm as the primary finding if applicable.

Example: Patient with known lumbar spondylosis (M47.816) presents today with an exacerbation of muscle spasm of the back (M62.830). The spasm is the primary driver of the current encounter and is secondary to the chronic degenerative changes. Billing focus: Sequencing of the acute spasm code as the reason for visit. Risk adjustment: Inclusion of the chronic spondylosis as a co-morbidity increases the patient's complexity profile.

Billing Focus: Primary diagnosis sequencing and secondary underlying conditions.

Specify the clinical episode and duration of the spasm (acute vs. chronic).

Example: The patient has experienced chronic muscle spasms of the back (M62.830) for over 6 months, resistant to conservative NSAID therapy. Symptoms are localized to the erector spinae. Billing focus: Documentation of the chronic nature to support long-term management codes. Risk adjustment: Chronic condition status affects long-term care planning and resource allocation.

Billing Focus: Duration of symptoms and response to prior treatments.

Detail the functional limitations caused by the spasm to support medical necessity for procedures.

Example: Severe muscle spasm of the lumbar back (M62.830) resulting in an inability to perform forward flexion or lateral rotation. Patient is unable to work or drive due to pain-induced guarded movements. Billing focus: Functional impairment supports the use of trigger point injection codes (20552). Risk adjustment: Severity of functional impairment demonstrates the impact of the condition on global health status.

Billing Focus: Functional impact on activities of daily living (ADLs).

Relevant CPT Codes

Related Diagnoses

Hierarchy