"They qualify for government-supported medical treatment and disability payments."
In the sentence above, why is the word "treatment" used as a singular noun, and "payments" as a plural noun? I guess there could be several different forms of disability payments, so using -s after payment seems ok, but why not treatment"s"?
Can't there also be many different kinds of medical treatments that the government supports? Or is the word treatment mostly used as an uncountable noun?
Any help would be greatly appreciated. Thanks!