Two numbers do most of the work: 30, and 27. Above 30 you generally meet the threshold on weight alone. Between 27 and 30 you meet it when a weight-related condition is documented alongside.
BMI is weight divided by height squared. At 30 and above it is generally accepted as the threshold for weight-management medication on weight alone.
Between 27 and 30 the threshold applies when a weight-related condition is documented. That documentation matters: a suspicion is not the same as a diagnosis, and insurers in particular want it on record.
Below 27, GLP-1 medication for weight management is not indicated, and a clinician should say so rather than prescribe around it. Anyone willing to is not screening you properly. Qualifying conditions, Do I qualify and Free assessment go further into it.
Two thresholds
Working it out
Getting your BMI right
Measure properly
Height without shoes, weight first thing. Small errors in height affect the result more than people expect, because it is squared.
Do the calculation
Weight in kilograms divided by height in metres squared. Any calculator will do it, and the number is the same everywhere.
Check for a condition
If you land between 27 and 30, whether you have a documented weight-related condition is the deciding factor.
Have it confirmed
A clinician checks the figure against your records, because self-reported height and weight drift.
Its limits
Where BMI gets it wrong
BMI does not distinguish muscle from fat, so it overstates risk in people carrying a lot of lean mass and understates it in people carrying little. It also says nothing about where fat sits, which matters more than the total for metabolic risk.
That is why it is the entry gate rather than the decision. Waist circumference, conditions already diagnosed and your history all carry more weight in the clinical judgement than the number itself. More on that in Qualifying conditions, Medical weight loss program and Weight loss timeline.
Muscle versus fatIgnores
Where fat is storedIgnores
A screening gateUsed as
Eligibility
Beyond the BMI requirement
The conditions, the exclusions and the free check.
The thresholds, accuracy, and what happens near the line.
Generally 30 or above on weight alone, or 27 and above where a weight-related condition is documented. Below 27 it is not indicated for weight management.
Worth a conversation, because conditions like sleep apnea and prediabetes are frequently present and undiagnosed. Testing may change the picture; guessing does not.
Not particularly. It cannot tell muscle from fat, so it overstates risk in people carrying significant lean mass. That is one reason a clinician looks at more than the number.
Treatment decisions are reviewed over time, and falling below the starting threshold is the point rather than a problem. What continues is a clinical conversation, and insurers sometimes have their own rules about it.
Often, but not always, and they usually add requirements on top such as prior authorisation or documented previous attempts. Meeting the clinical threshold does not guarantee funding.
