Why Did Our Group Health Renewal Go Up in Illinois

An Illinois small-group renewal can move for a short list of reasons, and most of them have nothing to do with your group. Federal law allows the rate to vary on four things only — whether the coverage is individual or family, the rating area, age, and tobacco use — and expressly forbids variation on anything else. Underneath that, every non-grandfathered small-group enrollee at your issuer sits in one risk pool with your employees, on and off the exchange. So the honest answer to the question is usually some combination of: the filed rates moved for the whole pool, your census aged into different age factors, your plan design or your address changed, or the benefit set the policy must carry changed between one renewal and the next. What it is almost never is a penalty attached to your group’s own claims.

The closed list, in the regulation’s own words

45 CFR 147.102 is titled “Fair health insurance premiums,” and it applies to coverage offered in the individual or small group market. Paragraph (a)(1) opens:

“The rate may vary with respect to the particular plan or coverage involved only by determining the following: (i) Whether the plan or coverage covers an individual or family. (ii) Rating area … (iii) Age, except that the rate may not vary by more than […] … consistent with the uniform age rating curve … (iv) … tobacco use, except that such rate may not vary by more than […] …”

The ratios are elided above deliberately; this site does not publish them. What matters for reading a renewal letter is the word “only” at the top and the sentence that closes the paragraph:

“The rate must not vary with respect to the particular plan or coverage involved by any other factor not described in paragraph (a)(1) of this section.”

That closing sentence is the whole answer to half the questions employers bring to a renewal. Not the group’s claims. Not anyone’s health. Not gender. Not industry. Not how long the group has been covered. If a factor is not on the list, it cannot move the rate.

Your renewal moves with people you have never met

The single most underexplained reason an Illinois renewal moves is that your group is not rated alone. 42 U.S.C. 18032(c)(2):

“Small group market. A health insurance issuer shall consider all enrollees in all health plans (other than grandfathered health plans) offered by such issuer in the small group market, including those enrollees who do not enroll in such plans through the Exchange, to be members of a single risk pool.”

Read that carefully, because it does more work than it looks like. Every enrollee, in every small-group health plan, at that issuer — including groups that bought outside the exchange — is one pool. Your employees are pooled with small-group enrollees at businesses in industries you have never heard of, in counties you do not operate in, who bought a plan design you did not consider.

When that pool’s experience moves, the rates the issuer files move with it, and your renewal moves even though nothing about your business changed. That is not a loophole and it is not the issuer being evasive when it declines to explain your increase in terms of your own group. It is the architecture. A renewal conversation that starts from “what did we do wrong” is starting from a premise the law does not support.

The Illinois statute that reads like an answer to this question

Illinois has a Small Employer Health Insurance Rating Act at 215 ILCS 93, and it does not govern your renewal. It needs describing anyway, because one of its provisions — §25(a)(3) — is literally a formula for how much a small employer’s premium may increase at a new rating period, and it is the passage most likely to be quoted at an Illinois employer who goes looking. As written, and in the past tense it deserves, the section capped the increase at the sum of the change in the carrier’s new business premium rate between the first day of the prior rating period and the first day of the new one, plus a capped annual adjustment due to claim experience, health status or duration of coverage, plus any adjustment for a change in coverage or in the employer’s case characteristics.

It reads as though it answers this page’s title exactly. It does not apply. 215 ILCS 93/15(b):

“This Act shall not apply to any health benefit plan for a small employer that is delivered, issued, renewed, or continued in this State on or after January 1, 2022. However, if 42 U.S.C. 18032(c)(2) or any successor law is repealed, then this Act shall apply to each health benefit plan for a small employer that is delivered, issued, renewed, or continued in this State on or after the date that law ceases to apply to such plans.”

Three things about that are worth having in front of you. First, the Act was not repealed — it is still on the books, its sections are still printed in full, and search engines still return them. Second, its §25 was even amended in 2023, after it had already stopped applying, so a current Source line on the section proves nothing about whether the section reaches your plan. Third, the revival condition is the single risk pool rule quoted above, which is in force, so the condition is not triggered.

This matters because the trap is not misreading the Act. The trap is quoting it accurately. Someone can hand you §25(a)(3) with a perfect citation and a current Source line and be describing a rule that has not applied to an Illinois small-group plan issued or renewed since the start of 2022. If anyone explains your renewal by reference to Illinois index rates, classes of business or a statutory increase cap, §15(b) is the section to put next to it.

One more caution, stated and not resolved: §25(a)(3)(B) of the dormant Act contemplates a renewal adjustment for claim experience, health status or duration of coverage, while 45 CFR 147.102(a)(2) forbids variation on any factor outside its four. Those two texts do not sit comfortably together. This page does not assert which instrument would prevail, because §15(b) means the question does not arise for any plan year an Illinois employer is renewing now.

The parts of a renewal that are not the rate moving

A renewal letter usually bundles several different kinds of change into one number, and separating them is most of the work.

Your census moved along the curve. Age is a permitted factor, applied within a federally capped band and a uniform age rating curve. A workforce a year older, or one that has hired and lost people, produces a different result from the same filed rates. Family-tier composition does the same thing through the individual-or-family factor. Neither is a new factor appearing; it is a changed input.

Your rating area changed. 45 CFR 147.102(a)(1)(ii)(B) fixes the small-group area on the employer’s side of the relationship rather than the employees’ — it is the policyholder’s registered address that governs, with a defined cascade for an address registered solely for service of process or sitting outside a network plan’s service area. Because Illinois draws its areas on county boundaries, relocating across a county line can move the area while relocating within one cannot.

Your plan design changed. If the plan you are being renewed into is not the plan you had, the comparison is between two products rather than between two rates for one product.

The benefit set can change at the renewal itself

The fourth kind of change is the one a renewal letter is least likely to spell out, and it is a feature of how Illinois coverage requirements are drafted. They commonly attach to policies “amended, delivered, issued, or renewed on or after” a stated date. Read that applicability clause literally: renewal is one of the four events that pulls a new duty onto your policy. A requirement enacted while your plan year was running does not touch the policy mid-term and then lands on it the day you renew.

215 ILCS 5/356z.80, in the text from P.A. 104-42, is a worked example. It requires coverage for medically necessary anesthesia services, regardless of duration, for any procedure covered by the policy, where the group or individual policy is amended, delivered, issued or renewed on or after January 1, 2026, and it separately prohibits denying payment or reimbursement for anesthesia services solely because the duration of care exceeded a preset time limit.

Note the Public Act inside that citation, because it is load-bearing rather than decorative. Seven unrelated sections of the Illinois Insurance Code share the number 356z.80, each printed under its own Public Act, so a bare “215 ILCS 5/356z.80” identifies none of them. If a renewal document cites a section in the 356z series, the Public Act is the part that tells you which duty is meant.

Why there is no Illinois renewal-increase figure on this page

Employers reasonably ask what the typical Illinois increase was this year, and the honest answer is that nothing this site draws from measures it.

The federal survey that publishes Illinois small-employer premium data reports an average premium level for a single data year, at private-sector establishments that offer health insurance. That is a level, not a movement. Turning it into a renewal-increase figure would mean differencing two editions of a survey to produce a number the survey does not publish, about a population that is not the same as the set of Illinois small employers as Illinois defines them. It would read as authoritative and it would not describe your renewal.

What is actually published and actually useful is the structure above: the four factors, the closed list, the single risk pool, and the disapplied state rating act. Those tell you which explanations for your increase are possible and which are not.

What to ask when the renewal arrives

Ask which of the four permitted factors changed for your group, and which did not. Ask whether the filed rates for the plan moved independently of your census. Ask whether the plan design being renewed is identical to the one you hold, and if not, what changed in it. Ask whether any new Illinois coverage requirement attaches to policies renewed on or after your renewal date, and for any section in the 356z series, ask which Public Act the citation refers to. And if the answer you get is framed in terms of your group’s own claims experience, ask which paragraph of 45 CFR 147.102(a)(1) that factor sits in.