Which action is recommended to strengthen payer portal security and access control when available?

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Two-factor authentication strengthens access control by adding a second verification step beyond a password. Even if a password is compromised, the attacker still needs the second factor—such as a code from an authenticator app or a hardware token—to log in. For payer portals that handle PHI and financial data, this extra layer greatly reduces the risk of unauthorized access and supports compliance with security expectations. Use a method that’s resistant to common weaknesses (prefer authenticator apps or hardware tokens over SMS) and require it for all users, with recovery options in case codes are lost. The other choices fall short: a single password remains vulnerable to phishing and breaches, blocking mobile access undermines usefulness and isn’t foolproof, and sharing credentials defeats accountability and access controls. Enabling two-factor authentication when available is the strongest safeguard for protecting payer information.