How Much BMI Is Considered Risky by Insurance Companies?

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Body Mass Index (BMI) is one of the most widely used health metrics in medical underwriting by insurance companies. BMI can be associated with a variety of health risks, including diabetes, high blood pressure, heart disease, sleep apnea, and more. Health insurance companies consider BMI when determining premiums, eligibility, and policy conditions. However, many applicants wonder what exactly the insurance provider considers a risky BMI.


The answer is not always easy, as each insurance company has its own set of underwriting criteria. But there is a wide range of BMIs considered low, moderate, or high risk by insurers.


What are Standard BMI Categories?


BMI is calculated using a person’s height and weight.


BMI categories are as follows:



  • Underweight: Below 18.5

  • Normal weight: 18.5–24.9

  • Overweight: 25–29.9

  • Obesity: 30 and above


These categories are used by insurance companies as a default benchmark to evaluate risk. Those who fall into the normal BMI range are typically at lower risk than those in the obesity categories.


When BMI Starts Becoming a Concern for Insurers


When BMI is above 30, most insurance companies start to take notice, as it indicates obesity. From this stage on, the risk of obesity-related conditions increases greatly. A BMI over 30 may be subject to additional medical exams, a more rigorous underwriting evaluation, or higher premiums.


This risk gets higher if people have a BMI greater than 35 or 40. These are among the increased risks for severe obesity for cardiovascular disease, stroke, Type 2 diabetes, joint disorders, and hospitalisation. If there are multiple health issues, some insurers might even impose waiting periods, apply policy exclusions, or refuse coverage in extreme cases.


Why Very Low BMI Can Also Be Risky


Although most attention is focused on obesity, being underweight can also be a concern when assessing insurance. A BMI below 18.5 is a sign of malnutrition, impaired immune function, chronic illness, or underlying medical conditions. Unexplained low BMI may be cause for concern for insurance companies, who may investigate it, as it could indicate future health risks or an increased risk of hospitalisation.


If BMI is extremely low, insurers might request further reports on nutritional health and digestive or chronic diseases before approving a policy.


BMI Alone Does Not Decide Insurance Approval


While BMI may be relevant, insurers do not usually use it as the sole determinant. Underwriting for medical insurance generally involves blood pressure, blood sugar, cholesterol, smoking history, family health history, and lifestyle habits.


A physically active individual who has a BMI of 29, but is in excellent metabolic health, would be offered better policy terms than a BMI of 22, but with uncontrolled diabetes and hypertension. Increasingly, modern insurers are paying more attention to health indicators rather than weight.


BMI Risk Levels Can Differ for Indians


Health risks might be observed at lower BMIs than in Western populations. Indians are at higher risk of developing diabetes and cardiovascular disease at BMI levels which are within the international norms.


This means that medical guidelines in India often consider an Asian man or woman to have an excess weight if his or her BMI is greater than 23, and obesity if it is greater than 25. This will make it tougher for insurers in India to view BMI in the same positive light as they may in some Western countries.