National Health Care Posts Third-Quarter Loss

National Health Care Systems Inc., the Irvine-based prepaid dental plan company, posted a third-quarter loss of $372,000, contrasted with year-earlier net income of $51,000. Revenue rose 50%, to $3.6 million from $2.4 million.

The company lost $58,000 during the first nine months of 1990, contrasted with net income of $229,000 in the year-earlier period. Revenue rose 49%, to $10 million from $6.7 million.

National Health Care attributed the losses to the termination of its indemnity product lines due to disputed legal interpretations and to an increase in its cash reserve.

The company said the revenue increase was due to increased enrollment in its dental plans.