Dischem test centres do not inform you of covid tests not covered by Discovery Med

I have two covid tests, both done at Dischem test centre at the Cape Town Airport. You pay upfront R420 per test before they test you but do not declare or make you aware that certain Medical Aids, like Discovery will not accept the claim. They know this because they told me when I enquired afterwards. Discovery requires an ICD-10 code on the invoice and Dischem says they provide what was agreed with the Medical aids, they don't have an ICD-10 code. Its not their problem.