What does 75 or 25% coinsurance mean

You need to check the deductible first.
Some policies have $500 to $5,000 deductible. 

Then for every $1,000 after the deductible is satisfied, the policy pays 75% or $750, and the patient pays 25% or $250. 

Thats a weird question but ill answer it i think 5.

Cotton with iron probably