Unfortunately, yes. In Washington DC, the insurance adjuster can (and often does) stop your benefits for no reason.
In D.C. workers compensation, insurance companies can stop your benefits for any reason - or no reason at all. All they have to do is file a notice of controversion, a simple forming stating a reason.
What are some of the reasons for an insurance company to stop your benefits?
They can have you examined by one of their doctors (an IME - insurance medical exam), say they are still investigating the claim, or that they don't have evidence of any current disability, or you didn't "cooperate" with a vocational counselor. They could also claim you're not cooperating by giving them all of the medical records they ask for (basically they want all the records from the day you were born). They can even make up a reason.
Then its up to you to win your case and get the benefits reinstated - but that could take many, many months by the time you go to a hearing and an Administrative Law Judge issues a decision.
That's why we take steps so our clients don't benefits cut off in the first place and act immediately when they do. We cover a lot of this in the book Protect Your Rights: The Ultimate Guide to D.C. Workers Compensation or you can call us at (202) 393 - 3320 and speak to a live person who will help you and can tell you what we do in this situation.