E11 vs P70.2
E11 and P70.2 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 E11
neonatal diabetes mellitus (P70.2)
E11
Type 2 diabetes mellitus
Not billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E08-E13
Use when the record says
- diabetes (mellitus) due to insulin secretory defect
- diabetes NOS
- insulin resistant diabetes (mellitus)
P70.2
Neonatal diabetes mellitus
Billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P70-P74
Indexed under
- Diabetes, diabetic › neonatal (mellitus) (sugar)
- Syndrome › diabetes mellitus in newborn infant
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