Will telling the VA my condition has improved lower my disability rating?

Being honest with a treating provider about how you feel is not fraud, and it will not automatically trigger a rating reduction. VA fraud generally involves intentionally lying to obtain or increase benefits you are not entitled to, or submitting false statements or documents on a claim. Accurately describing your symptoms during physical therapy is the opposite of that — it is exactly what your provider needs to help you.

That said, ratings are not permanent guarantees, and VA does have authority to reduce them if evidence shows sustained improvement. The process differs depending on how long you have held the rating. Under 38 CFR 3.344, ratings that have been in effect for 5 years or more (a "stabilized" rating) can only be reduced if the medical evidence shows improvement that is expected to be maintained under the ordinary conditions of life, not just during a rehabilitation period, a good day, or while actively receiving treatment. Ratings held less than 5 years are held to a somewhat lower evidentiary bar, but VA still generally must show material improvement based on a full and adequate reexamination, not a single offhand comment.

Before any reduction can happen, VA is required to follow due process under 38 CFR 3.105(e): it must send a proposed reduction letter, give you at least 60 days to submit evidence or request a hearing, and only then can it make the reduction effective, typically no sooner than the end of the following month after that period. You would not be blindsided by a single note in a treatment record.

For a combined 100% rating that includes a 30% knee rating, keep in mind that even if the knee rating were ever reduced, VA would still have to determine whether your overall combined rating (or TDIU status, if applicable) drops below 100%, factoring in all your other service-connected conditions. One improving joint does not automatically unravel a total rating.

Continuing physical therapy and reporting real progress is good for your health and is fully within your rights. If you are worried about a future reexamination, document your functional limitations honestly too — pain with weight-bearing, flare-ups, limited range of motion, need for bracing — since "feeling better" and "no longer meeting the rating criteria" are not the same thing.

The concrete next step is to speak with an accredited Veterans Service Officer (VSO) about your specific rating history and any reexamination notices you receive, so you have someone reviewing the medical evidence alongside you rather than relying on speculation.