You can claim up to ₹25,000 for premiums paid for yourself, your spouse, and dependent children. Separately — and this is the part people miss — you can claim up to ₹25,000 more for premiums paid for your parents, or up to ₹50,000 if either parent is a senior citizen (60 or above). These two limits stack, so a family paying for both their own policy and a senior citizen parent's policy could claim up to ₹75,000 in total, not just ₹25,000.
Preventive health check-ups are also eligible within these limits, up to ₹5,000 combined across the family, even if you don't have a claimable premium that year.
If you're paying premiums for your parents' health insurance but filing your taxes without claiming this separately, you're likely leaving a meaningful deduction unused — it's worth checking your policy documents and premium receipts specifically for this before filing.