(Bloomberg) -- There’s no way to tell how many people who think they’ve signed up for health insurance through the U.S. exchange actually have, after about 1 in 4 enrollments sent to insurers from the federal website had garbled included incomplete information.

The data transmission errors have been reduced to 1 in 10 since Nov. 30, the government said on Dec. 6. Still, the acknowledgment suggests consumers need to be vigilant about their health plan purchases. Letters from insurers confirming coverage can take a week or more, and the Obama administration now says people should call their companies if they aren’t contacted within that time.

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