Biosimilars are FDA-approved biologic medications highly similar to reference products, offering competitive pricing and expanding patient access. Between 2015-2023, biosimilars provided nearly 700 million therapy days without unique clinical challenges. The US biosimilar approval process is expedited, focusing on similarity to reference products. Interchangeability designation allows biosimilars to be substituted without prescriber intervention. President Biden's FY 2025 budget proposes unifying biosimilar and interchangeable standards. As of July 2024, the FDA has approved 56 biosimilars, including 10 adalimumab biosimilars. Biosimilars contribute to cost savings and market competition, with projected market growth to $129 billion by 2027. Policy changes, like CMS's temporary payment increase for biosimilars, aim to enhance accessibility. Health care systems like Providence St. Joseph Health have successfully integrated biosimilars, achieving significant cost reductions.