What group health insurance is and why companies offer it

Group health insurance is a health plan that a company buys from an insurance carrier to cover its employees. The employer typically pays part or all of the premium, and employees pay the rest through payroll deductions. Unlike individual health plans, group plans spread risk across many people, which usually means lower rates per person than employees could find on their own.

Companies offer group health insurance for practical reasons: it helps attract and keep workers, it's often tax-deductible as a business expense, and employees get coverage without having to shop for individual plans. The employer chooses which plan or plans to offer, sets the employee contribution amount, and handles enrollment and billing with the carrier.

Group plans come in several structures — Preferred Provider Organizations (PPOs), Health Maintenance Organizations (HMOs), Exclusive Provider Organizations (EPOs), and High Deductible Health Plans (HDHPs) paired with Health Savings Accounts. Each has different costs, networks, and rules about which doctors and hospitals employees can use.

Key Takeaways

  • Group health insurance requires you to choose a carrier, decide which plan types to offer, set employee contribution amounts, and handle annual enrollment and billing.
  • You must have at least one full-time employee to buy group coverage in most states, and the carrier will underwrite your company based on size, industry, and claims history.
  • Premiums vary by plan type, employee age and health status, location, and the benefits package you select — there is no single cost that applies to all companies.
  • You are required to follow federal rules about coverage timelines, waiting periods, and employee communication, and some states add their own requirements.
  • Open enrollment typically happens once a year, and you must give employees time to choose or change plans before coverage starts.

Who can buy group health insurance and what carriers require

Most states require a company to have at least one full-time employee (usually defined as working 30 hours per week or more) to purchase group health insurance. Some states allow sole proprietors to buy group coverage if they have no employees, but this varies by state and carrier.

When you approach a carrier, they will ask for basic information: your company's legal structure, number of employees, industry, location, and payroll. For new businesses or those with fewer than 50 employees, the carrier may underwrite your group — meaning they review your company's risk profile and may adjust rates based on what they find. Larger employers often get may provide issue rates, meaning the carrier cannot deny coverage or charge more based on the health of your employees.

You will need to provide a list of employees who are may be able to access for coverage, their dates of birth, and whether they are full-time or part-time. Some carriers also ask about prior coverage and whether anyone in the group has a serious health condition, though federal law limits how much they can use this information to set rates for groups of 50 or more.

Choosing a plan type and coverage level

The four main plan types work differently. An HMO requires employees to choose a primary care doctor and get referrals to see specialists; it has lower premiums but a smaller network. A PPO lets employees see any doctor without a referral and costs more but offers more flexibility. An EPO sits between them — no referrals needed, but only in-network doctors are covered. An HDHP has a high deductible but lower premiums and pairs with a Health Savings Account that employees can use to save pre-tax money for medical costs.

Within each type, you choose a coverage level: how much the plan pays toward deductibles, copays, and coinsurance. A plan that covers more costs upfront has a higher premium. A plan with a higher deductible and more cost-sharing has a lower premium. Most companies offer two or three options so employees can choose based on their expected medical needs.

You also decide what services are included — prescription drug coverage, mental health care, dental, vision, and preventive care like annual checkups and screenings. Federal law requires that certain preventive services be covered at no cost to the employee, but you control whether to add optional benefits like dental or vision.

Setting employee contributions and employer costs

You decide what percentage of the premium the company pays and what employees pay. There is no legal minimum — you could pay 100 percent or ask employees to pay 100 percent, though paying some portion is standard practice and helps with recruitment. Many companies pay 50 to 80 percent of the employee premium and ask workers to cover the rest.

The total cost to your company depends on the plan type, coverage level, number of employees, their ages, and your location. A small company with younger employees will pay less than a large company with older workers. Premiums also vary by state and by carrier — getting quotes from three to five carriers is normal practice.

When you set employee contributions, you must do so fairly and consistently. You cannot charge one employee more than another for the same plan based on health status. You can charge different amounts based on whether the employee covers just themselves or also covers family members, and you can charge different rates for different plan types.

Federal and state rules you must follow

Group health plans are regulated by federal law under the Employee Retirement Income Security Act (ERISA), the Affordable Care Act (ACA), and the Health Insurance Portability and Accountability Act (HIPAA). These laws set rules about coverage, waiting periods, employee communication, and privacy.

You cannot impose a waiting period longer than 90 days before a new employee becomes may be able to access for coverage. You must provide employees with a Summary of Benefits and Coverage (SBC) document that explains what the plan covers, what it costs, and what is not covered. You must also give employees a notice of privacy practices explaining how their health information is used and protected.

If you have 50 or more full-time employees, you must offer coverage to all of them or face potential penalties under the ACA's employer mandate. Part-time employees count toward this number. Some states have additional rules about coverage timelines, mental health parity, or specific benefits that must be included.

The enrollment process and annual administration

When you first set up group coverage, you choose an effective date — usually the first of a month. You then conduct an initial enrollment period where employees choose their plan and coverage level. This typically lasts 30 to 60 days, and you must give employees clear information about each option, the costs, and the deadline to choose.

After the first year, you run an annual open enrollment period, usually in the fall, where employees can change plans or coverage levels for the following year. You must give at least 30 days' notice before open enrollment begins. Employees who do not make a choice during open enrollment stay in their current plan.

Throughout the year, you handle billing with the carrier, process payroll deductions for employee contributions, and manage changes when employees are hired, leave, or have a life event like marriage or a new child. You also receive claims data and renewal notices from the carrier, usually 60 to 90 days before your plan year ends.

Common mistakes and how to avoid them

One frequent mistake is underestimating the time needed to set up a plan. Choosing a carrier, selecting plans, setting up payroll deductions, and conducting enrollment can take two to three months. Starting the process at least four months before your desired effective date gives you room for delays.

Another mistake is not communicating clearly with employees. Many workers do not understand their plan options or how to use their coverage. Providing a written summary of each plan, holding a meeting to explain the options, and naming someone in your company as the point of contact for questions reduces confusion and complaints.

A third mistake is failing to keep up with compliance. You must retain enrollment forms, coverage documents, and notices for at least three years. You must update your Summary of Benefits and Coverage if plan terms change. You must notify employees of changes to the plan. Missing these steps can result in penalties or loss of coverage.

Working with a broker or consultant

Many small and mid-size companies work with a health insurance broker — a licensed professional who represents the company, not the carrier. A broker can help you understand plan options, get quotes from multiple carriers, set up enrollment, and handle ongoing administration. Brokers are paid by the carrier, not by you, so there is no direct cost to use one.

A broker is especially useful if you have never bought group coverage before, if you are unhappy with your current plan, or if you have complex needs like multiple locations or a mix of full-time and part-time workers. A good broker will ask questions about your budget, your employees' needs, and your company's goals, then recommend options that fit.

You can find brokers through your state's insurance department, through professional associations in your industry, or by asking other business owners for referrals. Interview at least two or three before choosing one.

Frequently Asked Questions

Can I require employees to contribute to health insurance premiums?

Yes. You set the employee contribution amount, and it is deducted from their paycheck. You cannot charge different employees different amounts for the same plan based on health status, but you can charge more for family coverage than for individual coverage, and you can charge different rates for different plan types.

What happens if an employee gets sick after I set up the plan?

Group health insurance covers all employees regardless of health status once they are enrolled. The carrier cannot cancel coverage or charge more based on an individual employee's illness. However, if you are a small group and renew your plan, the carrier may adjust your overall group rate based on claims experience, though federal law limits how much they can increase rates.

Do I have to offer coverage to part-time employees?

If you have 50 or more full-time employees, yes — you must offer coverage to all full-time workers or face penalties. Part-time workers are not required to be offered coverage unless your plan rules include them. Many companies offer part-time employees the option to buy in at their own cost.

What if I want to change carriers or plans?

You can change carriers or plans during your annual renewal, which happens on your plan anniversary date. You must notify your current carrier and your employees of the change at least 30 days before the new coverage starts. Changing mid-year is possible but usually involves penalties or requires a may have access to event like a merger or significant change in your workforce.

How do I handle COBRA when an employee leaves?

If you have 20 or more employees, federal law requires you to offer COBRA — the right for departing employees to continue their health coverage for up to 18 months by paying the full premium plus a small administrative fee. You must notify the employee of this right within 14 days of their departure. Many companies work with their carrier or a COBRA administrator to handle this process.