The Affordable Care Act, also known as Obamacare, prohibited insurers from turning away consumers with pre-existing medical conditions, a practice that was once standard in the industry.

Among the conditions that once commonly made insurers deny coverage, according to a list assembled by the nonprofit Kaiser Family Foundation, were:

  • AIDS/HIV
  • Lupus
  • Alcohol abuse/drug abuse with recent treatment
  • Mental disorders
  • Alzheimer's/dementia
  • Multiple sclerosis
  • Arthritis (rheumatoid), fibromyalgia, other inflammatory joint disease
  • Muscular dystrophy
  • Cancer within some period of time (e.g., 10 years)
  • Cerebral palsy
  • Severe obesity
  • Organ transplant
  • Congestive heart failure
  • Paraplegia
  • Coronary artery/heart disease, bypass surgery
  • Paralysis
  • Crohn's disease/ulcerative colitis
  • Parkinson's disease
  • Chronic obstructive pulmonary disease (COPD)/emphysema
  • Pending surgery or hospitalization
  • Diabetes mellitus
  • Pneumocystic pneumonia
  • Epilepsy
  • Pregnancy or expectant parent
  • Hemophilia
  • Sleep apnea
  • Hepatitis C
  • Stroke
  • Kidney disease, renal failure
  • Transsexualism

The American Health Care Act, as the House Republican health care bill is called, does not explicitly eliminate Obamacare's coverage guarantee.

But the bill would allow states to obtain a waiver from the federal government to eliminate another Obamacare mandate that prohibits insurers from charging people with pre-existing medical conditions more for insurance.

That means that some people with pre-existing medical conditions could see their premiums spike dramatically, if the House bill becomes law.

In other words, a patient with diabetes, heart disease or cancer might still be "guaranteed" coverage, but only if he or she agreed to pay five or 10 times as much for a health plan.