An Arizona workers' comp claim doesn't stay open for active treatment forever. At some point your treating physician files a report finding your condition "medically stationary" — the point at which nothing further is medically expected to improve it, and it isn't expected to deteriorate either. Once that report is on file, the carrier issues a Notice of Claim Status closing the claim for active treatment. That notice is a formal, appealable determination, not a formality to skim past.
If the same report — or a later one — recommends care that isn't meant to improve your condition but is meant to keep it from backsliding, the carrier can authorize that as supportive medical maintenance care. It gets documented on ICA Form 103, "Notice of Supportive Medical Maintenance Benefits." Arizona Administrative Code R20-5-106 sets out what that form has to include: your name, your employer, the carrier, the claim ID number, a description of exactly what medical benefits are authorized, the date it was mailed, contact information for questions, and a statement of your reopening and appeal rights. If the form's description of what's covered is vague or doesn't match what your physician actually recommended, that's worth flagging early rather than assuming it will sort itself out at your next appointment.
Supportive care is not the same thing as reopening a claim, and mixing the two up costs people time. Reopening is a separate process under A.R.S. § 23-1061(H), and it requires a petition supported by a physician's statement showing a new, additional, or previously undiscovered condition connected to the original injury. An increase in subjective pain alone, without a corresponding change in objective medical findings, generally isn't enough to reopen a claim — that situation is closer to a supportive care question than a reopening question.
There's also a settlement path specific to supportive care. Under A.R.S. § 23-941.03, a worker and carrier can agree to settle out future supportive medical maintenance benefits for a lump sum instead of ongoing authorized care. That settlement isn't valid on a handshake or even a signed agreement between the parties — the carrier has to submit a summary of all reasonably anticipated future supportive care and its projected cost, and the Industrial Commission of Arizona has to approve the settlement before it's final.