INTRODUCTION Medical billing denials are very important and biggest challenges in Revenue Cycle Management (RCM). Claim denied means it will delay payment, increase administrative work and cost and affect the healthcare organization's revenue. Understanding the medical billing denials and types of denials and patient responsibility (PR) helps medical coders and billers reduce claim denials/rejections and improve reimbursement. When insurance companies refuse to pay the claim because it doesn't meet the payer's requirements. Claim may require corrections, additional information or an appeal before payment can be received. this is called denial. Types of Denials -  Most common types of denials are, 1) Soft Denials Its temporary denial that can usually be corrected and resubmitted.  Example,   - If modifier is missing so coders or biller may correct it or add modifiers. - If claim found with incorrect patient demographic information. - If authorization is missing so Ph...