Did you mean to say nephrology (which is the study of the diseases and functions of the kidneys) or neuropathy ? I can try to find the specific impairment listings if you could clarify whether it is a kidney or nerve problem
The impairment listing for DM says:
9.08 Diabetes mellitus. With:
A. Neuropathy demonstrated by significant and persistent disorganization of motor function in two extremities resulting in sustained disturbance of gross and dexterous movements, or gait and station (see 11.00C); or
B. Acidosis occurring at least on the average of once every 2 months documented by appropriate blood chemical tests (pH or pC02 or bicarbonate levels); or
C. Retinitis proliferans; evaluate the visual impairment under the criteria in 2.02, 2.03, or 2.04.
The specifics for how bad the retinopathy would have to be are :
2.02 Loss of visual acuity. Remaining vision in the better eye after best correction is 20/200 or less.
2.03 Contraction of the visual field in the better eye, with:
A. The widest diameter subtending an angle around the point of fixation no greater than 20 degrees;
B. A mean deviation of –22 or worse, determined by automated static threshold perimetry as described in 2.00A6a (v);
C. A visual field efficiency of 20 percent or less as determined by kinetic perimetry (see 2.00A7b).
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2.04 Loss of visual efficiency. Visual efficiency of the better eye of 20 percent or less after best correction (see 2.00A7c).
How they test visual efficiency is here: http://www.socialsecurity.gov/disabi...eech-Adult.htm