K91.2 vs M83.2
K91.2 and M83.2 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 K91.2
malabsorption osteomalacia in adults (M83.2)
K91.2
Postsurgical malabsorption, not elsewhere classified
BillableUnspecified
- Chapter 11
- Diseases of the digestive system
- Section
- K90-K95
Use when the record says
- Postsurgical blind loop syndrome
Indexed under
- Tachyalimentation
- Malabsorption › postgastrectomy
- Malabsorption › postsurgical
- Malnutrition › following gastrointestinal surgery
- Complication › surgical procedure › malabsorptionNEC (s) (from) (of)
M83.2
Adult osteomalacia due to malabsorption
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M80-M85
Use when the record says
- Postsurgical malabsorption osteomalacia in adults
Indexed under
- Osteomalacia › adult › due to › malabsorption
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