Source: http://www.irs.gov/instructions/i109495c/ar01.html, see the section titled Indicator Codes for Employee Offer and Coverage (Form 1095-C, Line 14)
1A. Qualifying Offer: Minimum essential coverage providing minimum value offered to full-time employee with employee contribution for self-only coverage equal to or less than 9.5% mainland single federal poverty line and at least minimum essential coverage offered to spouse and dependent(s).
Tip: This code may be used to report for specific months for which a Qualifying Offer was made, even if the employee did not receive a Qualifying Offer for all 12 months of the calendar year. However, an employer may not use the Alternative Furnishing Method for an employee who did not receive a Qualifying Offer for all 12 calendar months (except in cases in which the employer is eligible for and reports using the Alternative Furnishing Method for 2015 Qualifying Offer Method Transition Relief as described in these instructions).
1B. Minimum essential coverage providing minimum value offered to employee only.
1C. Minimum essential coverage providing minimum value offered to employee and at least minimum essential coverage offered to dependent(s) (not spouse).
1D. Minimum essential coverage providing minimum value offered to employee and at least minimum essential coverage offered to spouse (not dependent(s)).
1E. Minimum essential coverage providing minimum value offered to employee and at least minimum essential coverage offered to dependent(s) and spouse.
1F. Minimum essential coverage NOT providing minimum value offered to employee, or employee and spouse or dependent(s), or employee, spouse and dependents.
1G. Offer of coverage to employee who was not a full-time employee for any month of the calendar year and who enrolled in self-insured coverage for one or more months of the calendar year.
1H. No offer of coverage (employee not offered any health coverage or employee offered coverage that is not minimum essential coverage).
1I. Qualifying Offer Transition Relief 2015: Employee (and spouse or dependents) received no offer of coverage, received an offer that is not a qualifying offer, or received a qualifying offer for less than 12 months.