Muscle spasm of back

This code signifies an involuntary, sustained contraction of one or more muscles in the back region. It typically presents as acute pain and stiffness, often limiting range of motion. This condition is distinct from muscle weakness or paralysis.

Apply this code when documentation explicitly states "muscle spasm of back" or "back muscle spasm" as the primary diagnosis or a significant co-morbidity. This often arises from sudden movements, overuse, or underlying musculoskeletal issues. Supporting documentation should detail the location and nature of the spasm.

• Differentiate from muscle strain (S39.012-), which involves tearing of muscle fibers, versus involuntary contraction.
• Do not use for generalized muscle spasms (R25.2) or spasms of other specific body regions.
• Consider sequencing with an underlying cause if known, such as disc disorders (M51.-) or spondylosis (M47.-), if the spasm is a symptom of that condition.