I have been working for an american based lab named (Empire City Labs) as an ( AR executive) or (Medical biller). I have a working experience of almost all kind of insurances that are running their business in USA. Major insurances include ( Medicare , Medicaid , BCBS , AETNA , CiGNA , United Health care) and almost all minor insurances of america. I know the basic ICD-10 codes , the process of applying modifier , appealing with medical records , initial claim sending , resolving basic denials on claim , status on call etc.