NEW DELHI — Nirav Modi, the jeweler whose designs adorned Hollywood stars but who fled India this year amid accusations that he defrauded banks of $2 billion, has been found in Britain and is the subject of an extradition request, officials said on Monday.

Mr. Modi had been on the run since January as the nature of the bank fraud — the largest in India’s history — became public. Indian officials have accused Mr. Modi of working with tellers at a branch of a government-owned lender, Punjab National Bank, to obtain $1.8 billion from branches of other banks by issuing fraudulent letters of credit.

The accusations struck a nerve in India, where taxpayers have bailed out government-run banks numerous times and where farmers often commit suicide because of their inability to pay back loans worth just a few hundred dollars. The perception in much of the country, home to a third of the world’s poorest people, is that government lenders bankroll the lavish lifestyles of the elite.

Officials here have been at pains to paint a different picture, and on Monday they confirmed Indian authorities had requested that Britain send Mr. Modi back to India.