Scope

Is it possible to change the ID of the plan on my Chargebee site?

Solution
It is not possible to change the IDs of plans and price items under the plan. The IDs of any entity (including customers, subscriptions, addons, coupons, etc.) act as primary keys in identifying its associated entities in Chargebee. 

We can only edit the Ids while creating the plan or price item under the plan for the first time.

In case you are looking to use a different plan ID, it is recommended to create a new plan with the expected ID. You can then archive or delete the old plan. 

Related articles and Documentation
Creating plans