According to federal regulations, hospitals must provide a person with a MOON letter if they observe them as an outpatient for more than 24 hours, which can affect medical costs.

LONDON — King Charles III was briefly hospitalized for observation on Thursday after experiencing “temporary side effects’’ related to a scheduled cancer treatment, Buckingham Palace said ...

King Charles III was briefly hospitalized for observation on Thursday after experiencing “temporary side effects’’ related to a scheduled cancer treatment, Buckingham Palace said in a statement.

LONDON (AP) — King Charles III was hospitalized for observation on Thursday after experiencing “temporary side effects,’’ related to a scheduled cancer treatment, Buckingham Palace said in ...

LONDON, UK — King Charles III was briefly hospitalized for observation on Thursday after experiencing “temporary side effects’’ related to a scheduled cancer treatment, Buckingham Palace ...