ICD-10 Code E66 – Overweight and Obesity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E66 – Overweight and obesity
What it is
E66 identifies overweight and obesity, meaning excess body weight or body fat documented by the clinician. Use the code when the record states overweight, obesity, or a related obesity category without a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may note elevated body mass, increased adiposity, or obesity-related assessment findings. You should code only what the provider documents.
When to use this code
Use E66 when the provider diagnoses overweight or obesity and no more specific obesity code is documented. It may also support encounters where excess weight is relevant to evaluation, monitoring, or risk assessment. If the note specifies a subtype, code that more specific diagnosis instead.
Do not use for
Do not use E66 for obesity due to a documented underlying condition when a more specific code applies. Do not code it from appearance alone; check documentation.
Coding tip
Assign the most specific obesity code available and confirm whether the provider linked the condition to another diagnosis.