Small Business Health Insurance in Tennessee

What Tennessee added to the rate rules, and what it left alone

Who is small enough to be in this market

The line is drawn by the federal definition and Tennessee chose to leave it there. A small employer is one that employed an average of at least one but not more than fifty employees on business days during the preceding calendar year, and that employs at least one employee on the first day of the plan year — the definition at 42 U.S.C. 300gg-91(e)(4), the small-employer entry in the federal definitions list for these markets.

Several states took a federal option to move that ceiling upward. Tennessee did not: the Insurance Division wrote in Bulletin 15-01 that it was in the interest of Tennessee consumers and the industry to adhere to the federal definition and that it would not apply the state option. So the band an employer meets in Tennessee is the federal one, unmodified.

Two mechanics inside that sentence trip people up. It is an average taken across the preceding calendar year on business days, not a photograph of today’s payroll — a company can be over the line in July and still be a small employer for the plan year. And commonly controlled companies do not each get their own count: persons treated as a single employer under the Internal Revenue Code’s controlled-group rules are treated as one employer for this purpose (42 U.S.C. 300gg-91(e)(6)(A)).

The short list a premium may move on

In this market a rate may vary only by whether the coverage is for an individual or a family, by rating area, by age, and by tobacco use — and the rule then closes the door explicitly, saying the rate must not vary by any other factor (45 CFR 147.102(a)). Health status is not on the list. Neither is your claims history, your industry, or how last year went for your people.

States may tighten several of those, and many have. CMS keeps a table of every state-specific rating variation on record, and the Tennessee row is blank in every column but one — no state-set age ratio, no state age curve, no tobacco ratio, no uniform family tiers, no requirement that issuers offer averaged enrollee premiums. The table’s own legend resolves a blank the same way every time: the federal default applies.

The one rule Tennessee wrote for itself

A small group’s total premium is assembled person by person — the premiums of the covered participants and beneficiaries, summed. Nothing in the federal rule stops a state from requiring, or an issuer from offering, premiums based on average enrollee amounts instead, so long as the total group premium set at enrollment comes out to the same total (45 CFR 147.102(c)(3)(ii)). That is the mechanism behind the tier rates on a proposal: it is a way of presenting a total, not a way of changing it.

The federal default for doing that arithmetic is fixed — two average enrollee amounts, divided at an age the rule names — and it applies unless a state establishes and CMS approves an alternate rating methodology (45 CFR 147.102(c)(3)(iii)(B)). Tennessee is one of the states that went and got that approval: CMS records Tennessee as holding authorization for a state-specific composite premium method.

It is the single place in the rating rules where Tennessee speaks in its own voice, and it is worth knowing what it does not touch. It governs how a total is expressed as tiers; it does not reach the total, and it does not reach the geography, which is settled upstream by the address before any averaging happens.

Rates are filed before they are quoted

Under Tenn. Comp. R. & Regs. 0780-01-93-.03(1), initial premium rates for new policies and revised premium rates on previously approved policies must be filed with the Insurance Division for approval. So the figures in a Tennessee proposal are a filed, approved rate structure applied to your census and your address — not a number improvised across a desk.

What the map actually does, market by market

Eight Tennessee markets, grouped by what the rating boundary does to an address in each — not by size and not by alphabet. Every line rests on two things: the counties a city lies in, from the state’s municipal directory, and how Tennessee groups counties for rating.

Cities the boundary runs around

In these three, the county lines inside or beside the city have no pricing consequence at all — which is worth establishing first, because it is the situation most Tennessee employers are actually in.

Cities where moving an address moves the factor

Here the boundary is live. One of these markets has it running through the city; the other two sit on opposite sides of it inside a single part of the state.

Where the map follows neither the region nor the commute

The last two are the ones that break the assumptions employers bring with them — that the rating map tracks the state’s regions, or that it tracks where people travel to work.

Where the questions usually start

Four that open a Tennessee conversation more often than the rest. None of them is a question about price, and two of them turn out to be questions about the map.

The office moved across town and the county changed

“We moved the office last spring. Does that touch the plan?” It might, and the town is not the thing to check. The rating area follows the principal business address, so the question is which county the new registered address is in and whether Tennessee groups it with the old one. Around Nashville, Knoxville and Johnson City the answer is usually no. In Spring Hill it can be yes without the company leaving the city.

A second location opened and nobody decided which one was principal

“We have two shops now — do we get two quotes?” No: one group, one rating area, one address. The rule gives an order for settling it — the address registered with the state first, and failing that, the Tennessee address where the greatest number of employees works. Where two adjacent counties can sit in different rating areas, that is worth deciding on purpose before the paperwork decides it by default.

The payroll grew and nobody re-counted

“Are we still small?” Usually answered by the counting method rather than by today’s headcount, because the test runs on an average across the preceding calendar year on business days. Where it does bite is on ownership: commonly controlled entities count once, not separately. That is the version that surprises people, and it is better found in September than in the week of a renewal.

An employee turned the plan down and has nowhere else to go

“One of our people says he will just go without.” In a state that expanded Medicaid, part of that conversation is about eligibility. In Tennessee it generally is not, because the category is not there — so the alternatives are the federal marketplace or nothing. Employers do not always know that about their own state, and it tends to change how they think about the employee contribution before it changes anything else.

The documents this page stands on

Each of these was read for this page and carries something it argues from: the counties in a rating area, the definition behind the band, the authorization behind the composite method, the text of the act.

• CMS — the counties in each Tennessee rating area
• CMS — how states divide rating areas
• CMS — state-specific rating variations
• 45 CFR 147.102 — rating factors, the address rule, the composite method
• 42 U.S.C. 300gg-91(e)(4) — the federal small-employer definition
• TDCI Bulletin 15-01 (PDF)
• Tennessee Department of Commerce and Insurance, Insurance Division
• 2026 Public Chapter 932, as published (PDF)
• 45 CFR 155.20 — Federally-facilitated Exchange
• Medicaid expansion by state — Tennessee: not adopted
• Municipal directory — the counties each city lies in
• Tennessee Blue Book — the grand divisions (PDF)