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Doctor-booking services are worth a lot, apparently.

ZocDoc is reportedly raising a $152 million round at a $1.6 billion valuation, according to a Delaware Certificate of Corporation filing grabbed by VC Experts, and first reported by Fortune.

The document was filed on May 30, 2014.

ZocDoc previously raised $75 million from DST Global and Goldman Sachs, bringing its total funding to $97.9 million. DST Global is run by Russian entrepreneur Yuri Milner.

Founded in 2007, ZocDoc is a portal that enables people to search for doctors, read and submit reviews, and book appointments online. The company makes its money by charging doctors to list their practice on its site.

In February, the company said that it had surpassed 5 million users and was available in 2,000 cities (40 percent of the U.S. market), with plans to be available everywhere in the country by the end of 2014. It also been eyeing an international expansion, with job listings in other countries.

Earlier this month, ZocDoc launched “ZocDoc for Business,” a service that helps employers get their employees into wellness programs.

We have reached out to the company and will update when we hear more.

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