Roughly 9.5 million have chosen plans or reenrolled since Nov. 15.
More than 1 million people logged on in the final day to buy coverage for Jan. 1.
Providers must recognize same-sex marriages to participate in the program.
Marilyn Tavenner called inflated O-Care figures an "inadvertent mistake."
The "stupidity" consultant could be seated next to officials at a hearing.
Enrollees would be able to choose to be automatically enrolled in cheaper coverage.
Many lawmakers missed a Senate hearing on the response to the outbreak.
Federal health officials said the news is a victory for ObamaCare.
About 70 percent of new customers can use a shorter form on Nov. 15.
The disease has gained national awareness after the viral "Ice Bucket Challenge."
The groups are asking CMS to reschedule the database launch date to March 31.
AHIP has hired Mark Hamelburg, formerly of the Office of Legislation at CMS.
11.3 percent were uninsured in the first half of this year, down from 14.4 last year.
O-Care ads will now appear on 7-Eleven receipts at more than 7,000 store.
The "stupidity" consultant gave new fuel to attacks on O-Care's transparency.
"It's going to be a lot of fun," said a Republican aide.
The figures represent good news for the administration's efforts to control costs.
The Dec. 9 hearing is on the "transparency failures" behind the health law.
A program identifying Medicare billing errors, overpayments and underpayments is under attack.
A Bloomberg Government analysis found the healthcare rollout has cost $73 billion in total.
The Oversight chairman said officials "refused to admit" problems with HealthCare.gov.
The number is a new high for the program, which has been expanded in 26 states.
Despite more auditors, improper Medicare payments are rising, a new report says.
Auto-enrollment is meant to make it easier for people to stay on ObamaCare.