What does alphanumeric mean regarding my medicare subscriber number?

[fredadiamond]

Why isn't my medicare subscriber number acceptable?

[Vanessa A]

Clarification.  Where are you trying to enter your Medicare subscriber number?

[DoninGA]

Where in the TurboTax program are you being asked for a Medicare Subscriber Number?

The current Medicare card uses a 11digit/alpha character member number.  This new number was issued to all Medicare recipients two or three years ago and all new Medicare recipients.

[Mike9241]

alphanumeric simply means your medicare number which consists both numbers and letters