Close, perhaps... Vishay, for example, gives Idss leakage current as 1uA maximum at 60V 25C, and 500uA at 125C.
I can give you a few general pointers. First, for most MOSFETs I've measured, the leakage current is proportional to Vds, which means it can be modeled as a resistance. Assume a resistance that drops with temperature. Ahem, until one approaches breakdown, of course.
To complicate matters, the maximum leakage current for a given type varies considerably from manufacturer to manufacturer, and from batch to batch. However, the datasheet maximum leakage specs are usually VERY conservative from real parts, by factors of 100 to 10000, etc. This also varies from manufacturer to manufacturer and batch to batch.
For most FETs, it's doubtful.