If you are automating AWS resources in Terraform, then you will want to not hardcode things as much as possible.

Terraform makes it possible to pull the account_id from the local credentials.

How to get the AccountID data attributes

Create a data.tf file and place the following item in it:

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data "aws_caller_identity" "current" {}

Now the account_id will be available to you within your standard code as follows:

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data.aws_caller_identity.current.account_id

How to use the AccountID data attributes

This can now be used in a module, or wherever you need to reference the account id:

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module "my_custom_module" {
  tags        = var.tags
  vpcid       = var.vpcid
  subnetids   = var.subnetid
  account_id  = data.aws_caller_identity.current.account_id
  source      = "./modules/some_module"
}