What Can an Insurer Use to Rate Your Group in Colorado

Colorado does not leave a small group premium open to whatever an insurer would like to weigh. C.R.S. § 10-16-107(5)(a)(I) fixes the case characteristics a carrier may vary a small employer rate by, and the closing clause at C.R.S. § 10-16-107(5)(a)(II) bars every factor it does not name. Being closed is what makes the list useful.

The closed list, and why closed is the whole of the answer

Here is the operative text, from the Colorado Revised Statutes 2026 edition of title 10:

“(5) (a) (I) With respect to the premium rates charged by a carrier offering an individual or small employer health benefit plan, the carrier shall develop its premium rates based on, and vary the premium rates with respect to the particular plan or coverage only by the following case characteristics: (A) Whether the plan or coverage covers an individual or family; (B) Geographic rating area, established in accordance with federal law; (C) Age, except that the rate must not vary by more than [ratio elided] for adults; and (D) Tobacco use, except that the rate must not vary by more than [ratio elided]. (II) The carrier shall not vary a premium rate with respect to any particular individual or small employer health benefit plan by any factor other than the factors described in subparagraph (I) of this paragraph (a). (III) With respect to family coverage under an individual or small employer health benefit plan, the carrier shall apply the rating variations permitted under sub-subparagraphs (C) and (D) of subparagraph (I) of this paragraph (a) based on the portion of the premium that is attributable to each family member covered under the plan in accordance with rules of the commissioner.” — C.R.S. § 10-16-107(5)(a)(I)–(III)

The bracketed elisions in (C) and (D) are mine, and they are marked rather than silent. Colorado’s statute caps how far age and tobacco use may move a rate; the federal table CMS publishes as Market Rating Reforms — State Specific Rating Variations carries a Colorado tobacco figure that is not the same as the one in Colorado’s own statute. Sources that disagree about one number are a reason to print neither and to say so, not a reason to pick the more convenient one.

Everything else in the passage is publishable and is the answer. Subparagraph (II) is the sentence the whole question turns on. Without it, subparagraph (I) would read as a list of the things carriers usually use. With it, the list is complete and everything outside it is barred by name.

What the list leaves out, and what that means for a group that had a bad year

Read (I) and (II) together and the practical consequences are concrete. A Colorado small employer rate is not varied by the industry the business is in, by how many people are on the roster, by the gender mix of the group, or by what the group’s claims looked like last year. None of those is a case characteristic named in subparagraph (I), and subparagraph (II) forecloses the rest.

That is worth knowing before a renewal conversation, because it changes what a rate increase can honestly be attributed to. A Colorado small group increase is not the carrier re-underwriting your people; it is movement in the factors the statute does allow, or in the plan design, or in the rates filed for the pool your group sits in. If you are reading a renewal against last year’s, our renewal shopping service works the same statute from the employer’s side.

The protection that stops at the individual, and the rule that reaches the group

Colorado has a second provision in this area, and it is easy to over-read in either direction:

“(1) A carrier offering an individual or group health benefit plan shall not require any individual, as a condition of enrollment or continued enrollment under the plan, to pay a premium or, for group plans, a contribution that is greater than the premium or contribution for a similarly situated individual enrolled in the plan on the basis of any health-status-related factor in relation to the individual or to an individual enrolled under the plan as a dependent of the individual. (2) The prohibition in subsection (1) of this section does not: (a) Restrict the amount that a carrier may charge an employer for coverage under a group health benefit plan; or (b) Prevent a carrier from establishing premium discounts or rebates or modifying otherwise applicable copayments, coinsurance, or deductibles in return for adherence to programs of health promotion and disease prevention if otherwise allowed by state or federal law.” — C.R.S. § 10-16-105.6(1) and (2)

Both halves have to be said together. C.R.S. § 10-16-105.6(1) protects the individual employee’s own contribution from a health-status-related loading. C.R.S. § 10-16-105.6(2)(a) says in terms that this does not restrict what a carrier may charge the employer for the group. Quoted alone, that carve-out reads as though a Colorado small group can be loaded for health. It cannot — but the reason is the other statute. Health status is not among the case characteristics at C.R.S. § 10-16-107(5)(a)(I), so C.R.S. § 10-16-107(5)(a)(II) keeps it out of the rate. One section protects the person, the other closes the door on the group, and a reader who sees only one of them will get the answer wrong.

C.R.S. § 10-16-105.6(4) carries a narrow exception in the other direction: a time-limited surcharge above the modified community rate is permitted on a small employer group whose small group insurance was discontinued for nonpayment of premiums or for fraud, when that group reapplies. The size of the surcharge and how long it may run are both figures this post does not print.

Where Colorado’s geographic case characteristic comes from

Geographic rating area is on the list, and Colorado says where it comes from:

“The commissioner shall promulgate a rule concerning geographic case characteristics, which may include metropolitan statistical areas for small employers. In promulgating such rule, the commissioner shall take testimony from all interested parties, including, but not limited to, consumer advocates and consumers, insurers, health-care providers, the state demographer, and producers. The rule shall include, without limitation, the following features: (a) If the rule establishes separate geographic areas, in rate filings to the commissioner, a carrier shall be required to show that rates reflect a relativity to rates for other areas in the state and that rates and relativities are not excessive, inadequate, or unfairly discriminatory in such geographic areas…” — C.R.S. § 10-16-104.9(1)

The mechanism is the point here. Geography enters a Colorado small group rate through a rule the commissioner makes, with a filing obligation on the carrier to justify how one area’s rates relate to another’s. Which counties fall into which area is a separate question and belongs on our Colorado page rather than in a post about the rating rule.

How often the number is allowed to move

Colorado also limits the frequency, and then names its own exceptions:

“(b) The carrier shall not adjust the premium charged with respect to any particular individual or small employer health benefit plan more frequently than annually; except that the carrier may change the premium rates to reflect: (I) With respect to a small employer health benefit plan, changes to the enrollment of the small employer; (II) Changes to the family composition of the policyholder or employee; (III) With respect to an individual health benefit plan, changes in geographic rating area of the policyholder…; (IV) Changes in tobacco use…; (V) Changes to the health benefit plan requested by the policyholder or small employer; or (VI) Other changes required by federal law or regulations or otherwise expressly permitted by state law or commissioner rule.” — C.R.S. § 10-16-107(5)(b)

Limb (III) is scoped to individual health benefit plans, not to small employer plans — a change of geographic rating area is not among the mid-year triggers the statute lists for a small group plan. That is a distinction worth keeping, because flattening the whole subsection into “your rate can change when your business changes” loses it.

Buying away from the marketplace does not buy a different pool

One more provision closes off a question employers reasonably ask:

“A carrier shall consider all covered persons in all small employer health benefit plans, other than grandfathered health benefit plans, offered by the carrier, including those covered persons who do not enroll in the plans through an exchange established under article 22 of this title, to be members of a single risk pool.” — C.R.S. § 10-16-107(5)(c)(II)

Whether your group enrolls through Colorado’s marketplace or away from it, the carrier prices it against the same pool. Where you buy a group health plan changes the route and the paperwork; it does not change which population your rate is built on.

The federal floor underneath Colorado’s rule

Colorado’s closed list sits on top of a federal one that runs the same way. The rating rule at 45 C.F.R. § 147.102 reads:

“(a) In general. With respect to the premium rate charged by a health insurance issuer in accordance with § 156.80 of this subchapter for health insurance coverage offered in the individual or small group market— (1) 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, as established in accordance with paragraph (b) of this section. For purposes of this paragraph (a), rating area is determined— … (B) In the small group market, using the group policyholder’s principal business address. … (iii) Age, except that the rate may not vary by more than [ratio elided] for like individuals of different age who are age 21 and older… (iv) …tobacco use, except that such rate may not vary by more than [ratio elided]… (2) 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.” — 45 C.F.R. § 147.102(a)

The clause worth carrying away from that passage is the small-market rating-area rule: the group is located by the employer’s own principal business address, not by where each employee lives. A Colorado employer whose staff is spread across the state is rated from one address, and the federal text goes on to describe how a network plan is handled when the principal business address sits outside the plan’s service area. The scope limits at the end of that section also matter: 45 C.F.R. § 147.102(h) provides that the section does not apply to grandfathered health plans.

The part of Colorado’s law the 2026 change did not touch

Colorado’s small-employer band was amended effective January 1, 2026. The rating rule was not part of that change — C.R.S. § 10-16-107(5) reads today as it read before, and the last amendment reaching subsection (5) long predates it. That is a genuinely useful thing to know while Colorado employers are working out which market their plan now sits in: the question of which side of the band you fall on moved; the question of what an insurer may rate you on did not.

Which market your plan sits in still governs whether this closed list binds it at all, because C.R.S. § 10-16-107(5)(a)(I) is written for an individual or small employer health benefit plan. If you are not sure which side of the line your business now sits on, that is the first thing to settle — and it is the first thing we ask about.