Data from Families USA released Tuesday suggests if subsidies are withdrawn, Indiana's average $120-per-month health insurance premium would spike nearly 270 percent to a cost of close to $440 per month.
Here's a breakdown of how many people in each congressional district would lose subsidies.
Families USA research found 6.4 million people in 34 states where health care subsidies are available could lose that financial assistance.
Families USA assembled data from the Department of Health and Human Services on people enrolled in health care coverage. The department collected that data in each ZIP code, with the exception of ZIP codes with fewer than 51 enrollees, and the group aggregated the ZIP code data into respective congressional districts.
Families USA Executive Director Ron Pollack says the group hopes if the Supreme Court strikes down the subsidies, Congress would move to ensure their safety.
"If the subsidies are withdrawn, we can expect that younger and healthier people will be the first ones to drop out of coverage, and premiums are going to skyrocket," Pollack said on a conference call Tuesday. "It means we will experience a death spiral with respect to health insurance in each of these states."
Pollack says he's unsure what would happen to Indiana's "unorthodox expansion of Medicaid," the Healthy Indiana Plan 2.0, if the subsidies cease to exist.
"Gov. Pence obviously played a significant role in terms of trying to protect low-income people," he said. "I am hopeful that Gov. Pence will act accordingly and try to make sure the people who are now getting subsidies can continue to get protected."
The governor's office has not responded to requests regarding whether a contingency plan is being considered.
But in comparison to Families USA's data on neighboring states, Indiana appears to have less to lose.
In Michigan, around 228,000 people could lose their subsidies.
The average monthly premium for those receiving subsidies is $130 per month. With no subsidies, premiums would rise to $366.
In Illinois, close to 232,000 people could see theirs disappear.
The average monthly premium for those receiving subsidies is $128 per month. With no subsidies, premiums would nearly triple to $336.
And in Ohio, approximately 161,000 people would lose those federal dollars.
The average monthly premium for those receiving subsidies is $145 per month. With no subsidies, premiums would jump to $389.
Some states, including Delaware and Pennsylvania, have begun moving to a state-run exchange that would allow their residents to keep the subsidies regardless of the Supreme Court's ruling.