Body mass index [BMI] 39.0-39.9, adult

This code indicates an adult patient with a Body Mass Index (BMI) falling within the range of 39.0 to 39.9 kg/m². This BMI range is classified as Class II obesity, signifying a significant level of excess body fat that can pose substantial health risks.

Use this code when documentation clearly states an adult patient's BMI is between 39.0 and 39.9, inclusive. This is often seen in patients presenting for weight management, evaluation of obesity-related comorbidities, or as an incidental finding during routine examinations.

• Always confirm the patient's age to ensure the "adult" BMI category is appropriate.
• Code this as a secondary diagnosis when a more specific obesity-related condition (e.g., diabetes, hypertension) is the primary reason for the encounter.
• Ensure the BMI value is explicitly documented by a clinician, not just calculated from height and weight.