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Use cv_bridge and make sure to set the encoding to 16-bit

For example

cv_bridge::CvImage img16;
// copy raw image into img16.image
img16.encoding = sensor_msgs::image_encodings::MONO16;
// img16.header

Just remember to convert it into a 8-bit before displaying it.

image_callback(const snesor_msgs::ImageConstPtr& img)
    cv_bridge::CvImagePtr cv_ptr;
    cv_ptr = cv_bridge::toCvCopy(img, sensor_msgs::image_encodings::MONO16);  
    cv::Mat img8(HEIGHT, WIDTH, CV_8UC1);
    cv_ptr->image.convertTo(img8, CV_8UC1);
    cv::imshow("8-bit Mono", img8);