One more health insurer, Aetna Inc. has pulled out from an intended rate increase after an independent analysis found faults in the complex computations that the corporation made use of to explain for augmenting 65,000 policyholders' rates by an average of 19%.

The appraisal issued by a California watchdog found that Aetna Inc.'s plan wrongly multiplied, when altering the monthly premium into a yearly one and the rate hike was not calculated rightly.

The numerical mistakes led to increased rate hikes, but it's not clear how far off the rates were since the insurer pulled back the rate hike before the review was finished, Department of Insurance Spokesman, Darrel Ng said.

The analysis was part of a wider control measure by Insurance Commissioner, Steve Poizner, who prior this month asked for an independent assessment of all rate increases for individual strategies at the state's four largest insurers.

The top four firms control 90% of the market for the 1.1 million individual health policies controlled by Department of Insurance. The Department of Managed Health Care polices another 1.4 million such rules.

A projected hike from Blue Shield is presently under analysis, and future rises from Anthem Blue Cross and Health Net Inc. will be assessed.