I'll push back slightly on one thing — I don't think porting is always the clean solution people make it sound.
Yes, IRDAI portability rules protect your waiting period credit. But here's what actually happens on the ground: new insurers can re-underwrite your application. Your dad's BP can lead to a loading (higher premium) or even a specific exclusion added for cardiovascular conditions at the new insurer, even if Star Health had already accepted him cleanly. So you might port, lose nothing on waiting period technically, but end up with a worse policy for him.
My angle is different — instead of focusing on reducing waiting period, focus on layering coverage smartly.
Get a super top-up plan immediately. Something like Star Health Super Surplus or HDFC Ergo my:health Suraksha. These have lower premiums, and some super top-ups have shorter waiting periods than base plans. Use the base plan after waiting period is over, super top-up kicks in for high-value claims.
Also — Vikram, check this carefully — for your dad's BP specifically, 'controlled BP' with medication is usually still a PED. But if it's been stable for 5+ years with no hospitalization history, some insurers treat it more favorably during underwriting. Get this properly documented from his doctor before any porting application.
One thing most people get completely wrong: they think buying a new policy separately (instead of porting) is faster or easier. It's not — you lose ALL waiting period credit and start from scratch. Never do that. Always port, never rebuy fresh.
Bottom line: don't rush to port right now at 6 months. Finish at least 12 months, use employer group cover in the interim, then decide.