[4] Adhikari took part in the Sikkim Legislative Assembly election of 2009, contesting from two constituencies, Rhenock and Chujachen.

[8] However, in August that year, Adhikari transferred and was appointed as spokesperson of the Hamro Sikkim Party (HSP) which was led by Bhaichung Bhutia.

[12][13] On 30 August 2023, Adhikari resigned from HSP due to health issues, including cancer.

[14] Biraj Adhikari died at a hospital in Manipal, Tadong, Gangtok on 7 March 2024, at the age of 62.

He had been hospitalised since February 2024 and had retired from active politics due to health issues.