Canadian looking for advice re: Medicaid in the state of WA

I currently live in Vancouver, Canada and was appointed as POA for my uncle who lives in Lacey, WA. A few weeks ago I got a call from the hospital and the doctor told me his mental health has declined. He was living independently but cannot anymore. We cannot afford a caregiving service and I’m looking to apply to Medicaid for him. I found the application online but also saw that there can be ‘Estate Recovery.’ Will I be affected once he passes away? He doesn’t have any assets or investments, just some savings (which might be used up while the application is being processed) and a decent pension from working at the Post office which majority of which goes to his monthly payments at a seniors facility. TIA