Hi Sue,
That's very curious why your doctor won't provide a Diagnosis Code to a patient. I have spoken to customer service at my insurance company and they say sodium chloride is not covered by Medicare Part D but says it is covered by Medicare Part B. So I tried with both CVS and Walgreens but they both say it's not covered under Part B either. When I was with Kaiser, my co-pay was $8 for 30 days of sodium chloride solution. I am now on original Medicare with an Aetna prescription plan. I had to pay CVS $26 out of pocket with Goodrx coupon for one moth's worth of 3% solution. My doctor's office worked with Walgreen's and got it down to $11.50 for one month. If I can continue getting the $11.50 per month price, I might stop wasting my time trying to get Medicare Part B to pay for it.
lora jo

In reply to @ljfoo … in my case, it took a number of attempts to get the 7% solution covered by pt. B. What ended up resolving the issue was having the pharmacist call my pulmonologist’s office and walk them through how to submit the script in the way needed for Medicare. It finally worked and has worked for the past two years now! This is another idea to try. Good luck!