FY2027
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Excludes1 pair

E46 vs R63.6

E46 and R63.6 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 R63.6
malnutrition (E40-E46)
E46

Unspecified protein-calorie malnutrition

BillableUnspecified
Chapter 4
Endocrine, nutritional and metabolic diseases
Section
E40-E46
Use when the record says
  • Malnutrition NOS
  • Protein-calorie imbalance NOS
Indexed under
  • Calorie deficiency or malnutrition
  • Malnutrition
  • Cataract › malnutrition-dehydration
  • Deficiency, deficient › protein
  • Malnutrition › protein
R63.6

Underweight

Billable
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Section
R50-R69
Indexed under
  • Underweight

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