Hi,
Unfortunately, if you mean a 'human readable' model number you'll have to do a lookup table yourself. Lenovo do not store the human form in the BIOS, and store instead just the type number.
Lenovo say that this is OK because you can just write a script to take the first four digits of the machine type and equate this to a model for IT Admin needs. Lenovo don't help though as they don't provide a definitive file for this purpose.
In my opinion, it's barking mad as they store the machine type TWICE in the BIOS. But they won't be swayed.
If you buy lots of Lenovo machines and have an custom BIOS service with them, one option which I've been told is possible is to have Lenovo store the 'human readable' form in the model field, and the machine type in the 'product' field. That way, Lenovo would be in line with everyone else and your inventory would look nice..