(HealthDay News) — There have been significant fluctuations in medical malpractice premiums, based on doctors’ age, location, workload and practice size, according to a report published in Medical Economics.

Noting that medical malpractice premiums appeared little changed in 2013 for primary care physicians (PCPs), the authors examined variations in payment amounts. Considerable fluctuations were noted in payment amount based on several factors.

According to the article, doctors working more than 90 hours per week reported the biggest increase in medical malpractice premiums (14.8%). Increases of 13% and 9.3% were noted for PCPs seeing 200 or more and 175 to 199 patients per week, respectively. 

Substantial increases were also seen for PCPs in larger practices, with a 19.3% increase for those working in practices with 26 to 50 physicians, compared with an 11.9% increase for those in practices with 50 or more physicians. 

Decreases in premiums were reported by younger doctors and those in their first years of practice, with a 20% decrease for physicians under age 30 years.

“Although it’s still too early to gauge the impact of the Affordable Care Act on the malpractice insurance market, Jack Meyer [senior vice president for the Doctors Company, a malpractice insurance carrier] expects the influx of new patients the legislation creates to have ‘a negative impact’ on claims frequency,” according to the article.

Read more about the potential impact of the ACA on malpractice.