No. The Federal Drug Administration has to approve marijuana for use before insurance companies can cover it.
Since cannabis is still classified as a Schedule I controlled substance by the FDA it is unlikely it will approved for insurance company reimbursement.
In July 2017 the U.S. House of Representatives overwhelmingly passed legislation that would allow Veterans' Administration doctors to recommend cannabis as a method of treatment for veterans in states where medical marijuana is legal.
The Senate rejected the measure.