ICD-10 Code E66.81 – Obesity class (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E66.81 – Obesity class
What it is
E66.81 identifies obesity classified by class in ICD-10-CM. Use it when the record documents obesity with a stated class and no more specific obesity code is provided.
Clinical signs
Clinical features vary; refer to documentation. Obesity class is usually supported by the provider’s diagnosis and a documented obesity class rather than by symptoms alone.
When to use this code
Use this code when the clinician records obesity class and does not document a more specific obesity type or cause. It may appear in problem lists, assessment notes, or discharge summaries when the class designation is part of the diagnosis.
Check documentation if the chart only notes overweight, increased body weight, or general obesity without class detail. You should code the documented diagnosis exactly as stated.
Do not use for
Do not use E66.81 for overweight, childhood obesity without class documentation, or obesity due to a specific underlying condition if another code is documented. Check documentation.
Coding tip
Assign E66.81 only when the provider clearly documents obesity class; if the class is missing, query or code the more specific documented obesity term.