"JOH is listed on FlyerTalk's "List of publicly usable Marriott reservation codes" as one of the widely-circulated three-letter ticker codes. A self-identified J&J employee was cautioned: "the code is not meant to be shared publicly — the proper way to get it is to email someone from your company." hotelcorporatecodes.com lists JOH at 10-15% discount with "⚠️ Sometimes" verification. FlyerTalk general pattern: pharma/healthcare corporate codes at full-service Marriott yield ~30% chance of check at urban US properties, near-certain in Europe/Asia, essentially zero at select-service. The code's ticker-symbol obviousness means it circulates widely, which has historically triggered audit flags at some properties."

"I now always make it a matter of course to carry documents (business cards of my contacts, e-mails requesting my visit etc.) from my host company when I travel. This has always proven sufficient for the few times I've been challenged by the front desk clerk."

"My employer does not have a corporate rate but when I'm consulting for a company that does, I use theirs. I've only been challenged for identification once. In that one situation I explained the consulting arrangement, and the desk clerk accepted it without a badge or business card (neither of which I had anyway)."