Diagnosed with severely dysplastic mole. Is it melanoma in situ?

Wow it seems like you got this mole removed just in time.  Thank goodness.  To be clear, a severely dysplastic mole is not the same thing as melanoma in situ.  A dysplastic mole means that there is a significant number of abnormal appearing cells in the skin biopsy.  A melanoma-in-situ means that there are actually cancerous melanoma cells in the lesion, but the melanoma cells themselves have not invaded the surrounding skin borders yet.  Either way, your mole needs to be removed completely with an adequate margin and you need to be monitored carefully at regular intervals by a board-certified dermatologist for any future suspicious lesions.  In addition, you need to make sure that you maintain life-long safe sun habits and sunscreen use.  

A dysplastic nevus or mole is not the same as melanoma.  You do need to have it removed fully with clear margins and be on the lookout for any future suspicious lesions.  Talk to your dermatologist at your next checkup or call them directly for a more detailed description of your pathology report if you still have questions.  Continue to use good quality mineral containing (zinc or titanium dioxide) sunscreen, a rash guard-type swim shirt if you do a lot of swimming, and keep up with regular dermatologic exams.  Best of luck!

Sounds like you caught this mole in time. Based on the path report, it is technically NOT melanoma in situ. Regardless, you had it removed with 5mm margins, which should be more than adequate treatment even if it was melanoma in situ. The important thing here is to keep a close eye on the rest of your moles and get screened by your dermatologist each year so you can catch lesions very early like you did this one.