Hello Naveen,
Sorry that this difficulty remains. I had confused the SSM2166 with the differential-input pre-amp ICs often used where I work, but actually the SSM2166's data sheet shows it has a single-ended input. Thus the MIC-Low input is the same as ground, and only one LC filter is needed as shown below. This schematic is simply that of the chip's evaluation board, to which I added the LC filter. I show it as a pseudo-differential input in case you wish to use a three-pin mic with the usual "balanced" (2 conductors plus shield) cable -- however in this case you would be better off with a true differential preamp (or an input transformer, but those get expensive)..
I'm wondering how strong, and how close, is the FM transmitter involved. Also whether the preamp circuit is in a shield box. I also show in red a 220 pF cap you could try adding directly across the op-amp inputs.
Best regards,
Bob