Google's corporate venturing unit led a round that boosted Zephyr Health's overall funding to more than $33m.

US-based healthcare IT company Zephyr Health has secured $17.5m in a funding round led by Google Ventures, the corporate venturing arm of internet company Google.

Kleiner Perkins Caufield & Byers (KPCB) and Icon Ventures also took part in the round, which followed a $15m round co-led by KPCB and Jafco Ventures in January 2014. Zephyr has now raised $33.5m altogether, it said, but has not disclosed details of its earlier funding.

Founded in 2011, Zephyr’s technology relies on big data…