UPDATE 1-HealthCare.gov transactions fail 10 pct of time -official

Friday, 6 Dec 2013 | 3:27 PM ET

(Adds details of error)

Dec 6 (Reuters) - The U.S. federal health insurance website HealthCare.gov, which has had technology problems since its Oct. 1 launch, is now experiencing errors in transmitting applications about 10 percent of the time, a government spokeswoman said on Friday.

The online insurance marketplace relays information about new customers in '834' transaction forms to the private insurance companies that provide the health plans. HealthCare.gov serves people in 36 states, while 14 states are running their own websites.

"We believe nine of 10 transactions are being successfully transmitted," the Centers for Medicare and Medicaid Services, or CMS, spokeswoman Julie Bataille said at a news briefing.

Previously, Bataille has said they had fixed the majority of errors in these transactions but had not defined either the current or past rate of mistakes.

Insurers have said those forms have had many errors and they have been working with CMS to fix the issues before Jan. 1, when the new plans go into effect.

Since Oct. 1, HealthCare.gov could have experienced an error in as many as one in four transactions, Bataille said. Errors include forms not being generated, transmitting duplicate forms and of forms with technical data being passed incorrectly, she said.

(Reporting by Caroline Humer; Editing by Doina Chiacu)