Do I report money received from my employer, but not listed on my W-2, which was earmarked for monthly insurance premiums, as wages not already reported (misc. income)?

[KrisD15]

It depends on how those payments were made. 

If done properly, the payments would not be claimed as income and the health insurance premiums would not be claimed as medical expenses nor deductions.  

If claimed as wages, your employer would be liable for the employer's share of the employee's FICA (Social Security) tax. 

Please speak with your company's payroll department for clarity. 

Link with more information

[beilime]

The payment was issued to me (in my name) via a check from my employer's business account.  I did not claim the amount as income, nor did I claim the portion of my health insurance premiums paid by my employer as a medical expense or a deduction. 

[SamS1]

It would be not taxable income.  This sounds like a Sec 125 cafeteria plan your employer set up.  Under Sec. 125, employers with a qualified written plan are permitted to offer employees a choice between at least one permitted taxable benefit and at least one qualified nontaxable benefit, without the choice itself triggering taxation.

The permitted taxable benefit can include cash, various types of paid time off, and/or severance pay. Qualified benefits are those that, under the application of Sec. 125(a), are excludable from gross income by express provision of Chapter 1 of the Code.  Since payments were earmarked for monthly health insurance premiums, they would not be taxable payments.