E66 vs Q87.11
E66 (Overweight and obesity) compared with Q87.11 (Prader-Willi syndrome), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. E66 carries an Excludes2 note covering Q87.11: “Prader-Willi syndrome (Q87.11)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| E66Overweight and obesity | Q87.11Prader-Willi syndrome | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99) |
| Definition | Overweight and obesity is a non-billable ICD-10-CM category code (E66). | Prader-Willi syndrome is a billable ICD-10-CM diagnosis code (Q87.11). |
| Use additional code | code to identify body mass index (BMI), if known, for adults (Z68.1-Z68.45) or pediatrics (Z68.5-) | code(s) to identify all associated manifestations |
| Code first | obesity complicating pregnancy, childbirth and the puerperium, if applicable (O99.21-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources