He appeared as the judge on Indian Idol in seasons 1 (October 2004 – March 2005) and 2 (November 2005 – April 2006), and was a celebrity judge in seasons 3 (17 August 2007) and 4 (16 January 2009 and 6 February 2009).
He returned on Sa Re Ga Ma Pa L'il Champs International as a judge with Suresh Wadkar in October 2007.
Nigam was a celebrity judge on the Sa Re Ga Ma Pa Mega Challenge grand finale on 12 December 2009 .
Nigam hosted the TV show Kisme Kitna Hai Dum on Star Plus in 2002.
In 2011, Nigam collaborated with Kakas Entertainment and Laxmikant-Pyarelal for a Maestros Concert performing Mohammed Rafi songs. His songs include "Cheluve Yeke Bande", from the film Majnu, composed by Gurukiran; "Titanic Heroine Nee Nanna Cheluve", from the film Snehaloka; the title track from the film Monalisa composed by Valisha Sandeep; The songs "Mungaru Maleye" and "Anisuthide" were composed by Mano Murthy and written by Yogaraj Bhat and Jayant Kaikini respectively.
Nigam's first song in Kannada was in 1996 for the film Jeevanadhi. Nigam has said that he finds Kannada songs more fulfilling than the Hindi numbers.