E16.2 vs E89.1
E16.2 and E89.1 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 E89.1
transient postprocedural hypoglycemia (E16.2)
E16.2
Hypoglycemia, unspecified
BillableUnspecified
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E15-E16
Indexed under
- Glycopenia
- Hypoglycemia (spontaneous)
- McQuarrie's syndrome (idiopathic familial hypoglycemia)
- Decrease › glucose (d)
- Encephalopathy › hypoglycemic (acute)
E89.1
Postprocedural hypoinsulinemia
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E89
Use when the record says
- Postpancreatectomy hyperglycemia
- Postsurgical hypoinsulinemia
Indexed under
- Hypoinsulinemia, postprocedural
- Postpancreatectomy hyperglycemia
- Hyperglycemia, hyperglycemic › postpancreatectomy (transient)
- Postprocedural › hypoinsulinemia
- Complication › surgical procedure › hyperglycemia (s) (from) (of)
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