Exhibit 23.3

Consent of Independent Registered Public Accounting Firm

PDI, Inc.

Parsippany, New Jersey

We hereby consent to the incorporation by reference in the Prospectus constituting a part of this Registration Statement on Form S-3 of PDI, Inc. of our report dated October 29, 2014, relating to the financial statements of the Acquired Property of Asuragen, Inc. for the year ended December 31, 2013 appearing in the PDI, Inc.’s Current Report on Form 8-K/A dated October 29, 2014.

We also consent to the reference to us under the caption “Experts” in the Prospectus.

/s/ BDO USA, LLP

Woodbridge, New Jersey

October 2, 2015