help writing an aproval letter

awhile back i seen a letter on here that was very good. i need help writing an approval letter to my insurance that i can have my pcp loook over and sign... anyone have any copys that i can use as a guide.. it would be apppreciated... thanks...

Not sure if this is what you are looking for, but it is what I used and changed what needed to be revised.  Good Luck. http://www.obesityhelp.com/content/letterofmedicalnecessity. html