52 million Americans have pre-existing conditions that could hinder coverage if Obamacare repealed

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About one in four people have pre-existing conditions that would have made it difficult for them to get health insurance prior to President Barack Obama's health care law, according to a new analysis from the Kaiser Family Foundation.

The law, the Affordable Care Act, made it illegal beginning in 2014 for health insurance companies to deny coverage for someone with a pre-existing condition – a move that used to be common practice among insurers, who would use an applicant's health status and history to decide whether to issue coverage. Some examples of conditions that could lead to automatic denial included cancer, diabetes, epilepsy, heart disease and pregnancy.

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Though President-elect Donald Trump has said he intends to follow through on his campaign vow to "repeal and replace" the health care law, he also has said he would be in favor of keeping its provision for people with pre-existing conditions, and many Republicans in Congress have said the same. Among voters, it remains one of Obamacare's most popular provisions.

The Kaiser Family Foundation used data from two large government surveys as well as manuals from insurance companies to arrive at their conclusions. If the pre-existing protections were to be repealed, then 52 million people under the age of 65 would have difficulty getting private coverage, the analysis concluded. The data do not include the number of people who may not be denied because of their condition but who might have had to pay more before Obamacare. Others may have had particular medications denied, such as those used to treat HIV, arthritis or diabetes.

20 mistakes that are hurting your health:

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20 mistakes that are making your home unhealthy
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20 mistakes that are making your home unhealthy

1: Not Keeping a Barrier Between You and Your Bedding

Use zippered dust-proof casings for pillows and mattresses. The pore space of such casings is so small that dust mites and their waste products can't get through.

2: Vacuuming Without a HEPA Filter

Use HEPA (high-efficiency particulate air) filters to prevent tiny particles of dust from being blown back out into the air.

3: Forgetting to Change the Vacuum Filter

Changing the filter is an essential part of keeping dust out of the air and preserving the life of the machine. Change the filter once it's showing wear and tear or every six months if you're using a HEPA filter.

4: Forgetting to Change the AC Filters

Never run your heating or air conditioning system without filters, and be sure to change them at least every three months.

5: Not Ventilating Your Bathroom

Running the exhaust fan (and making sure it's vented to the outdoors) helps remove moisture from this naturally humid room.

6: Not Attending to Your Gutters

Leaky gutters can cause excessive moisture to enter your basement or crawl space. If you don't have covered gutters, frequent litter removal is a must year round.

7: Too Many Textiles in the Bedroom

Carpeting, rugs, pillows, upholstered headboards and chairs are all dust catchers. Consider minimizing furnishings for an easier-to-dust environment.

8: Too Many Textiles in Your Living Area

The living room is the same as a bedroom. Keep upholstery to a minimum to reduce the amount of dust mites.

9: Inviting Allergens Into Your Yard

Avoid plants that are wind-pollinated — grasses are among the worst pollen offenders.

10: Not Following Your Nose

If you detect a musty smell in your home, inspect closely until you find the source of the smell. The sooner you find the mold, the easier it will be to remove.

11: Not Organizing Your Home Office

Clutter can harbor a plethora of dust mites — this includes stacks of papers, old magazines and office equipment. File paper inside a cabinet to stay organized and keep dust away.

12: Wearing Shoes Inside the House

Not only is wearing shoes indoors a health risk, but it can also increase allergens. Wet leaves bring in mildew and pollutants from grass get trapped on the bottom of shoes. Take your shoes off outside, or put them in a washable tray as soon as you walk in the door.

13: Letting the Trash Pile Up

You could attract some unwanted guests (like mice and roaches) inside your home if you let your trash pile up. Their droppings can worsen your allergies, so make sure you stick to a routine of taking out the trash.

14: Displaying Houseplants

You may enjoy your beloved fern, but houseplants encourage mold growth. Mold spores live in warm, wet dirt, so limit the amount and time you display them.

15: Letting Your Pet Sleep in Your Bed

Your favorite part of the day may be snuggling up to your fur baby, but pet dander traps allergens — which means you're inviting those allergens to your bed. If you can't resist the cuddles, then you should completely shave your dog. Just kidding — just be sure to bathe them once a week.

16: Keeping the Temp Too High

Dust mites and mold love to live in warm climates. Keep your thermostat around 70 degrees to help keep them at bay.

17: Installing Wallpaper in the Bathroom

Patterned wallpaper is a beautiful addition to any room, but installing it in wet rooms (bathrooms and kitchens) can increase the risk of mildew. Opt for tile or textured paint that's mold-resistant.

18: Not Using the Exhaust Fan When Cooking

If you love cooking, all that steam from the stovetop will produce excess moisture. Turn the exhaust fan on to reduce it, helping to decrease the chance of mold.

19: Ignoring Your Bathmat

Think about it. You step onto your bathmat completely wet on the daily. To keep it fresh (and to keep mildew away), hang it to dry after every use, and stick it in the washer once a week.

20: Avoiding Protective Wear While Gardening

Even if you aren't highly allergic to pollen, it can still irritate your eyes, nose and throat. To prevent this, always wear a mask and gloves while working in the yard.

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The analysis also found that in some states – Alabama, Arkansas, Indiana, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Oklahoma, Tennessee and West Virginia – roughly 30 percent of adults under age 65 have pre-existing conditions. Florida and California have the highest number of people with pre-existing conditions, at 3.1 million and 4.5 million, respectively.

Copyright 2016 U.S. News & World Report

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