A shocking I-Team investigation showed you why you should never take that insurance card in your wallet for granted.

TODAY’S TMJ4 Investigative Reporter Aaron Diamant has an important follow up.

You saw how insurance companies can legally cancel a group's health coverage without telling the group's members.

Now, the state has launched its own investigation into the same case the I-Team investigated.

Dan Szerbowski didn't know his health insurance company dumped him until after he got colon cancer and had surgery.

“My brain is so numb over all this lately,” Szerbowski said.

When his boss bounced the check he wrote to secure the policy for his employees from United Healthcare, the company canceled it, three months before Szerbowski got sick.

“We just were in shock. We couldn't believe that he let this happen,” Dan’s wife, Sharon Szerbowski said.

Neither Szerbowski's boss or the insurance company said a word to him, so he filed a complaint with the state's commissioner of insurance last fall.

"I have dealt with my share of hospitals, and you just feel for someone like that,” Wisconsin Commissioner of Insurance Sean Dilweg said.

After looking into it, an examiner told Szerbowski in a letter that she "understood his frustration," but was "unable to resolve his complaint," because United Healthcare "did not break any laws."

Under Wisconsin law, insurance companies only have to notify a policy's administrator when it cancels coverage. It's the boss's job to tell the employees.

Szerbowski's boss didn't do that.

“We talked every day. Nobody let me know,” Szerbowski said.

After the I-Team started asking questions about Szerbowski's case, the commissioner of insurance re-opened the complaint a few weeks ago.

TODAY’S TMJ4’s Aaron Diamant: “What's different now than was different a few months ago?"

“We feel there are some issues there that warrant looking at it again,” Dilweg said.

The commissioner won't say what those issues are until his investigation is done.

Commissioner Dilweg said his office deals with more than 8,000 complaints a year, and that it's not uncommon for cases to be reopened.

We'll let you know what happens with this case in the coming weeks.