What does subsidised vs private means?

I've went for 1 consultation and 1 glucose resistance test at subsidized rate. you can see the differences from the bill. I will opt for subsidized one until 3rd trimester, then switch to private then ward A for delivery. If you've switched to private at later stage, but facing early delivery and know that ur baby will be warded in NICU, u still can downgrade to subsidized rate as the expenses in NICU could be crazy.