G.B.
Call your insurance provider and tell them your son needs to see an ENT doc. This doc will be able to set you on the right path. My grandkids are on state assistance and they get full coverage for things like this.
My grandson in foster care was found to be deaf. He didn't even respond to a bass drum being banged by his head.
The ENT decided to put tubes in to see if it would help. Sometimes the ears are not draining right and they can't convey the sound wave correctly.
When the doc was inside the ear during the surgery he found debris from ear infections that the antibiotics had never healed. He cleaned out the ear canals and when my little grandson woke up he could hear, totally freaked him out, but he could hear. It was really wonderful.
Bypass the docs and go directly to the ENT, some are called ORL instead but they both do Eyes, Ears, Noses, and Throats.