Can you let me know if I will need a
Biopsy necessary for diagnosis...
Biopsy is a diagnostic test. It is essential test to confirm diagnosis.
You did not mention your problem and the tests performed until now. I'd be able to know if biopsy will be necessary based on those details.
Awaiting your response...
I went through the scan done last year. The scan reveal presence of multiple nodules - the condition referred to as multinodular goitre. Usually this is a benign but times it become otherwise. Biopsy is the diagnostic test to determine the nature of nodules. Your treating doctor/surgeon will be able to decide based on how the nodule progressed during the course of years.
In other words, yes you will need the biopsy. Your doctor will decide when biopsy could be performed.
Hope this helps. Let me know if you need clarifications.