Yes, CONCIERGE is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, N 1, C 3, I 1, E 1, R 1, G 2, E 1.

Is it a valid word?

CONCIERGE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a French caretaker of apartments or a hotel; lives on the premises and oversees people entering and leaving and handles mail and acts as janitor or porter