Age They No Longer Check PSA

You did not share his PSA histology, but I think that it is wiser to find what is causing  the high levels of the serum.

I wonder if his doctor stops monitoring the PSA in patients older than 75 which is the age when surgery is no  more recommended.

'A young 76' may have many more years of good quality life ahead of him. Hence, I would also recommend to continue monitoring. 

If insurance won't pay for the test, I have read that it isn't expensive to pay for it out of pocket.

There is a trend towards reducing PSA screening screening in general and for older men in particular because of the belief that the higher deterction of PSA has resulted in unncessary treatment and seriously adverse side effects w/relatively little benefit in terms of mortality. 

See: https://www.cnbc.com/2017/04/10/new-guidelines-for-prostate-cancer-screening.html

However, ever case is diffferent and if you and your husband think he is "at risk" for prostate cancer that would be life threatening, you certainly can still ask the the procedure be done or go elsewhere to get it done.

Good  luck!

I was diagnosed about the same time as AS Advocate, and was also fortunate to be monitored in a active surveillance program. One of my doctors, a surgeon recommeded active surveillance as well. I was grateful to have this choice, espeically when the doctor(a radiologist ) that I saw previously recommended a combiation of two different radiation treatments, brahy and IMRT, and told me that there was a 50 percent chance the cancer was outside the prostate and I had 8 weeks to make a decision, or else.

Following an active surveillance protocol, I have lived a "normal" life for the last nine years.

 When the new guidelines were being formulated and  issued, I, other survivors,  and many, many doctors wrote letters to these decision makers asking them to not institute this policy, and indicated that  men will die resulting from this policy. many men will be diagnosed with more advanced disease, that cannot be treated locally. There will be more deaths among this population that would be diagnosed when there are symptoms, and cure is not possible. 

I believe that the reason that these guidelines were instituted was mainly to limit short term expense and also  to stop overtreating when men are candidates for simply monitoring. Eventhough there are doctors that will not treat men with indolent disease, many men are terrified at the word "cancer" and seek a doctor who will treat. Over treatments includes surgery, all forms of radiation, HIFU, etc, etc.