Note: This section is so chock full of tables & graphs that I've broken it into two sub-sections...I'll be posting the 2nd half of Part 5 over the weekend...
If you've ever wondered why healthcare wonks (myself included) rarely talk about the ACA's Catastrophic Level plans (or at least it was rare up until last year, when the Trump Regime decided to try opening up the floodgates on them), and why the only time I usually discuss Platinum Plans is in the context of high-CSR enrollees being eligible for "Secret Platinum" plans (labeled as Silver), the first table below should explain why.
Catastrophic ACA plans are only available at all in 34 states +DC (this is actually down from 40 states +DC last year), and less than 0.3% of all ACA exchange enrollees choose Catastrophic plans...just 67,000 nationally. Even if you only include the states where they're available this only increases to 0.36% (although they did reach 4.4% of total enrollments in Montana this year).