How can I use one password for two sites?

My insurance site, myuhc.com, and prescription site, optumrx.com, insist on using the same password. They try to save to Healthsafe ID: https://accounts.myuhc.com/rt/login/myuhc/en?TARGET=https%3A%2F%2Faccounts.myuhc.com%2Frt%2Fsecure%2Fauth%2Fmyuhc%2Fen%3Fresume%3D%2Fas%2FlcysN%2Fresume%2Fas%2Fauthorization.ping%26spentity%3Dnull%26scope%3Dopenid%2520profile%2520benefits%26response_type%3Dcode%26pfidpadapterid%3DHsidMyuhcWebOidcEN%26redirect_uri%3Dhttps%3A%2F%2Fwww.myuhc.com%2Fmember%2FhsidLogin.do%26client_id%3Dmyuhc-hsid-prod&resume=%2Fas%2FqiBu3%2Fresume%2Fas%2Fauthorization.ping&reason=0

Is there any way to use the same password for two sites?

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