Excludes1 pair

M51- vs S33.0-

M51 and S33.0 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

The official note, declared on S33.0

rupture or displacement (nontraumatic) of lumbar intervertebral disc NOS (M51.- with fifth character 6)

M51

Thoracic, thoracolumbar, and lumbosacral intervertebral disc disorders

Not billable

Chapter 13: Diseases of the musculoskeletal system and connective tissue
Section: M50-M54

S33.0

Traumatic rupture of lumbar intervertebral disc

Not billable

Chapter 19: Injury, poisoning and certain other consequences of external causes
Section: S30-S39

Indexed under

Rupture, ruptured › traumatic › intervertebral disc › lumbar

These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027