M81.6 vs M89.0
M81.6 and M89.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on M81.6
Sudeck's atrophy (M89.0)
M81.6
Localized osteoporosis [Lequesne]
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M80-M85
Indexed under
- Osteoporosis › Lequesne (female) (male)
- Osteoporosis › localized (female) (male)
M89.0
Algoneurodystrophy
Not billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M86-M90
Use when the record says
- Shoulder-hand syndrome
- Sudeck's atrophy
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