IRDA has introduced TPA (Third Party Administrator) for fast and quick settlement of Insurance claims.
TPA as a third party facilitates claim settlement only based upon the policy terms and conditions. Presently, TPAs are catering more for Mediclaim cases.
Note, TPA make tie-ups with hospitals. And get themselves empanelled with insurers, who allots TPAs mediclaim policies to be serviced by them. In simple words, TPAs are fixed by insurance companies and not chosen by individuals.
Also insurers like Bajaj, ICICI are offering Cashless services directly without the help of TPAs.
Hence important is to choose an experienced insurer and the plan they are offering. Rest will automatically work.
Regarding Insurance cos - ICICI, TATA, STAR Health, Appollo DKV, Future Genrila, National,United India, New India and OICL are few names which you can try at your end.
For comparision of different Plans visit this link: http://www.bimaworld.com/forums/topic/a-comparison-sheet-for-medical-insurance-of-all-insurance-companies
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