The loss for the three months to March 31 came in at 134.17 billion rupees compared with a net profit of 2.62 billion rupees a year ago, the fourth-biggest Indian lender by assets said in a statement.
Shares in PNB fell 6 percent after the results.
In what has been dubbed as the biggest fraud in India's banking history, PNB in February disclosed two jeweller groups had defrauded it of more than $2 billion, raising credit overseas with fake guarantees issued by rogue PNB staff.
Police on Monday charged 22 people, including a former head of PNB and two of its current executive directors. A source familiar with the matter said more people are likely to be charged later this week.
Gross bad loans as a percentage of total loans jumped to 18.38 percent at end-March from 12.11 percent three months earlier and 12.53 percent a year ago.
($1 = 67.8550 Indian rupees)
(Reporting by Vishal Sridhar in Bengaluru; Editing by Murali Anantharaman and Edwina Gibbs)
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)