The phrase "already being treated" is correct and usable in written English.
It can be used when discussing a situation where someone is currently receiving treatment for a condition or issue.
Example: "The patient is already being treated for their condition, so we need to consider alternative options."
Alternatives: "currently receiving treatment" or "in the process of treatment".
The company hopes to reach adolescents already being treated for behavior disorders.
But its treasury was already being treated as source of private wealth by the political elite, according to observers.
While clinical trials still await the use of human MSC, horse tendon injuries are already being treated with autologous bone marrow-derived MSC.
And some models presented here were already being treated as punch lines, like the Trabant nT, an electric updating of the infamous East German people's car.
Certain breast cancers are already being treated differently from others because of genetic markers like estrogen receptor and Her2, and also more complicated patterns of genetic activity.
The claim seemed to many people the delusional high point of what was already being treated, outside Alabama, as a fairly farcical crusade.
I was grateful that my outstanding oncologist had recommended the equally outstanding risk-assessment specialist at the hospital where I was already being treated.
The disqualification clears the path to office for General Alkhanov, who is already being treated as if he were president-elect.
The tests on the Bellmawr employee were still not final, but the man is already being treated with antibiotics for a skin lesion that developed on Oct. 13.
A different analysis of that study found that it did result in improved cholesterol levels, even though many patients were already being treated with statins.
Police then learned that three other people, a man and two women, had been shot at the home and were already being treated at hospitals.
