Excludes1 pair
M51- vs M54.6
M51 and M54.6 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 M54.6
pain in thoracic spine due to intervertebral disc disorder (M51.-)
M51
Thoracic, thoracolumbar, and lumbosacral intervertebral disc disorders
Not billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M50-M54
M54.6
Pain in thoracic spine
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M50-M54
Indexed under
- Pain › thoracic spine
- Pain › spine › thoracic
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