**M54 — Dorsalgia** is the umbrella ICD-10 code for back pain in adults. It includes upper, mid, and lower-back pain when the specific etiology is not documented.
Clinicians use sub-codes for greater specificity: M54.2 (cervicalgia, neck pain), M54.5 (low back pain), M54.6 (pain in thoracic spine), M54.9 (dorsalgia, unspecified).
Belongs to **Chapter M** — Diseases of the musculoskeletal system and connective tissue (M00-M99).
