The default reporting is three dimensional (typically time, category, and measure), but it's possible to increase this to four and sometimes five depending on the complexity of the dataset.
Usually, four dimensional calls are not recommended, and five dimensional calls will not complete for many customers and reports. With each dimension, you can expect the call time to go up by an order of magnitude.
As a possible workaround you can make multiple four dimensional calls and combine the results. Combining the total with the results for each account will produce the same data set as the five dimensional call.
API documentation can be found here: https://apidocs.cloudhealthtech.com/
The following diagrams illustrate the relationship of lower dimensional data sets to higher dimensional ones: