A compact dual-band implantable multi-slot patch antenna for biotelemetry applications is proposed here. The proposed dual-band antenna operates at both WMTS frequency band of 1395–1400 MHz as well as the 5.8 GHz ISM band. The size of the dual band antenna is greatly reduced by inserting multi-slots into patch and ground plane in an asymmetric patterns. The proposed antenna occupies a compact size of 12 X 12 X 0.64 mm³. The antenna, which is fed by a microstrip feed line, achieves gains of -20.29 dBi and -8.52 dBi at dual-band of operation. The proposed antenna has the potential to be employed in different implantable biomedical devices for real-time monitoring of physiological data due to its small size and dual-band characteristics. Specific Absorption Rate (SAR) is also analysed to ensure human safety conditions.