VeriChip is the first Food and Drug Administration (FDA)-approved human-implantable radio-frequency identification (RFID) microchip. It is marketed by VeriChip Corporation, a subsidiary of Applied Digital Solutions, and it received United States FDA approval in 2004. About twice the length of a grain of rice, the device is typically implanted above the triceps area of an individual’s right arm. Once scanned at the proper frequency, the VeriChip responds with a unique sixteen-digit number which can correlate the user to information stored on a database for identity verification, medical records access and other uses. The insertion procedure is performed under local anesthetic in a physician's office and once inserted, is invisible to the naked eye. As an implanted device used for identification by a third party, it has generated controversy and debate.

Destron Fearing, a subsidiary of Applied Digital Solutions, initially developed the technology for the VeriChip. Smith, Richard M. “Tough Sell Ahead for the VeriChip Implant ID System.” Computer Bytes Man. 27 Dec. 2001. 16 Oct. 2007 http://www.computerbytesman.com/biometrics/verichip.htm >.

In the beginning of 2007, Verichip Corporation created Xmark, its corporate identity for healthcare products. Xmark incorporates the Hugs and the Halo system of infant protection; the RoamAlert system of wandering protection; the MyCall emergency response system; and the Assetrac asset tracking system.