--that many physicians are familiar with--that of the longest nerves in the toes and feet being affected first, as they are farthest from the center of circulation--is a common pattern of presentation with diabetic/impaired glucose neuropathies, but it's not the only presentation (or even the only diabetic one).

Not all neuropathies are length dependent--compressive neuropathies (such as radiculopathy--nerve root compression) and autoimmune neuropathies, in particular, can pop up anywhere. So can neuronopathies (often referred to as ganglioneuropathies--attacks on the dorsal root ganglia). And, of course, shingles and its attendant neuropathy can show up anywhere.

What can be annoying are physicians who, if you don't present with the "classic" presentation, assume you don't have peripheral neuropathy and assert your problem must be central nervous system in origin. The brain and spinal cord should be checked, of course, but such physicians need a little continuing education.