Good catch! Forgot to mention the "H" version.
Actually, the "H" after the 8300 is all that needs to be worried about to ensure that you get the unplated brass receptacle. The "I", or "W", or whatever letter specifies the color of the receptacle. So, to sum up:
HBLIG5362x--Isolated ground spec grade, unplated, 20A
HBLIG8300x--Isolated gound, hosp. grade, nickel plated, 20A
HBL8300Hx--Hosp. grade, unplated brass, 20A
So many choices...so little time!
Like Rushton mentioned, the "H" version, is shallower than the regular 8300, or 5362 for that matter, and is a lot easier to install in shallow electrical boxes.