NPS is notoriously unreliable. When I’m frustrated with a stupid support clanker, I don’t wait for another different clanker to ask me how it did. I hang up.
If that’s how you’re measuring patient satisfaction, you’re completely clueless.
NPS is asking your customers "how likely are you recommend us to a friend or colleague?". That's definitely not an accounting number. If you care about this, you can instead ask your _new_ customers if someone recommended you. Or you could hire a third party to do an independent survey among your target demographic.
If that’s how you’re measuring patient satisfaction, you’re completely clueless.