Is there financial aid available for a stair lift?

For all practical purposes, Medicare does not pay for stair lifts.

"The one possible exception to this rule is Medicare might pay for a small portion of the cost if the stair lift has an elevating seat which helps the rider to sit down and get up from the chair safely. However, such a feature would only be available in a high-end stair chair which would cost considerably more than the amount Medicare would reimburse the purchaser. In other words, the amount of financial assistance would be less than the additional cost for a stair lift which has that feature."

"Medicare supplemental insurance policies also do not cover stair lifts. These policies are intended to help with co-payments and deductibles for goods and services covered by Medicare. Since, Medicare does not help, neither would a Supplemental or Medigap policy." [source, Paying For Senior Care].

Does he have Medicare? If so, ask them if it is covered.

My Dad is not a veteran and a ramp is not an option...a stairlift is really the ideal solution. Thank you,

Have you considered a ramp - 15 stairs is a lot for someone who's blind to navigate. Are there other entrances that could be adapted for a ramp, such as a back or side entrance?

There are more threads on this issue here:

https://www.agingcare.com/search.aspx?searchterm=stair+lift+financial+assistance

If your father a veteran? If so, has he applied for any type of VA aid? The VA does provide some assistance for assistive devices.

Here is a similar question that was asked recently that has helpful answers.

https://www.agingcare.com/questions/crippled-elderly-mother-needs-stair-lift-201173.htm?cpage=1

One thing to keep in mind, would your Dad use the chairlift if it was installed? Best to have him try one out before installing. Some elders become frighten using such a device.