The consolidation in the online health market continues: WebMD (NSDQ: WBMD) is buying online health info site QualityHealth.com and its owner Marketing Technology Solutions (MTS) for $50 million. Another $25 million could be earned based on performance in 2009.

MTS, based in Jersey City, NJ, had revenue of about $21 million in 2007, and focuses on marketing brands to consumers using targeted health data and information, reports AP. QualityHealth.com, founded in 1999, has about 5.5 million visitors each month while WebMD reaches about 48 million visitors each month. More details here.