Low income health care card rules??

I get a part disability pension and my partner gets a carers allowance of $159pfn plus he works and we declare his income. I have a health care card and they put his name and CRN on my card then they posted him his own card out. In July his card needed renewing so we gave his earnings which was under the thresholds but added my part pension in which took earnings just over and his card declined for renewal but he’s still on my card and I haven’t received any thing to say he can’t use it. I’m really confused by this and really worried they’ll take my card off me too as our monthly scripts are almost $1,000 without a HCC. Can anyone tell me if he’s eligible to use my HCC?