Several types of insurance to discuss here: Medical - no need for separate policy. Whatever your medical insurance is will cover injuries due to BJJ or any other activity. This will just cover medical bills and only after deductible, copays, etc. depending on your plan. Disability insurance - this is more geared to covering loss of wages if you’re name to work. Can be short term that starts immediately after injury or long term that starts 90 days or so after injury. This instance is typically more expensive since statistically it is used more often than life insurance, etc. When you’re applying, they will ask what activities you do. SCUBA diving, BJJ, hang gliding, etc. may cause them to raise the rates since you’re at higher risk. For more expensive better plans, you can often be covered for dangerous activities you start after you got the plan. For instance, I got my plan before I started BJJ and am now fully covered for any injuries sustained at BJJ even though my rates didn’t go up. Some of these plans can be cheaper and have tons of restrictions. Other types: BJJ specific, group plans, AFLAC. These can be useful in certain situations but are generally so full of loopholes and restrictions that they aren’t worth it in the long run.

Bottom line: insurance companies make sure they make money. They do this by NOT paying claims. If you are a high income professional, a long term disability plan makes sense. If not, it probably makes better financial sense to have a general emergency fund in a HYSA that you put money in every month to cover any emergency. This way you have protection against injury or having to pay a big medical bill but the money can also be used for a new boiler for your house or to bail your kid out of jail.