Claim Denied For a Preexisting Condition?

First here is some background information…

I have been receiving methadone maintenance treatment for opiate addiction non stop for 6 years. when i first began receiving treatment i had insurance through my employer and they covered it.

In August 2013 I was let go due to company restructuring and lost my insurance. In November 2013 I found a new job and started receiving insurance in December of 2013 through my new employer.

My insurance plan covers substance abuse treatment.

I had insurance through my employer with Humana beginning Dec 2013 through Dec 31 2014.(Beginning Jan 2015 my employer changed insurance providers)

I go to a methadone clinic for opiate addiction. They do not accept insurance so I pay cash at a rate of $110 per week. I filed a claim with my insurance provider to receive reimbursement for the substance abuse treatment i received, and they denied my claim for treatment for the dates starting jan 2014 through October 2014 because they said it is a pre existing condition, and said that I had to wait 1 year before I could be covered for this.

They said because I had a gap in insurance coverage longer than 63 days when I lost my previous job that they would not cover it. I have been treated for this condition ongoing for 6 years never a gap in treatment.

My question is, I thought with the new laws that there were no more ore existing condition exclusions? Can they legally deny my claim because its a pre existing condition?

Thank you for your help. I hope I provided enough information