FY2027
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Excludes1 pair

E15 vs R40-

E15 and R40 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 R40
somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15)
E15

Nondiabetic hypoglycemic coma

Billable
Chapter 4
Endocrine, nutritional and metabolic diseases
Section
E15-E16
Use when the record says
  • drug-induced insulin coma in nondiabetic
  • hyperinsulinism with hypoglycemic coma
  • hypoglycemic coma NOS
Indexed under
  • Hypoglycemia › coma
  • Shock › insulin
  • Coma › hypoglycemic › nondiabetic
  • Hyperinsulinism › with › coma (hypoglycemic)
  • Hypoglycemia › drug-induced › with coma (nondiabetic)
R40

Somnolence, stupor and coma

Not billable
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Section
R40-R46

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