"Siemens Premium Hilton code (N0079268) is a higher-tier Siemens corporate code at Hilton. FlyerTalk's "London Hiltons now requesting corporate ID if using codes" thread specifically documented systematic enforcement for premium-tier corporate codes. Siemens' Munich and London presence means premium Hilton properties in those markets (Hilton Munich, Conrad London) encounter Siemens employees regularly. The "Premium" designation suggests deeper discounts, which correlates with higher enforcement probability."

"One thing I am curious about is whether the hotel CRM shows the booking channel. Most true corporate travel is booked through something like Concur, AMEX GBT, CWT, etc. If the agent sees the booking come through one of those channels with a person's name on it and then gets a card or photo ID (not corporate ID) from said person, it's a pretty low fraud risk. But if it is a reservation through the hotel's channels using just a typed-in code, then I'd think they would have reason to be more strict in seeking proof of affiliation."

"I've only ever been asked about it once and I basically said "Yes I work there" and there were no follow up questions. That was on a personal trip but booked through the portal Hilton set up that allows employees to book personal travel using the corporate rate."