GRIFFIN, J.

Although its obligation was only secondary, plaintiff no-fault insurance carrier paid most of the medical expenses of its insured when he was seriously injured in an automobile accident, and then brought this suit for reimbursement against defendant health insurance carrier whose coverage of the same insured was primary. However, the action is time-barred if, as the Court of Appeals held, the one-year limitation of § 3145(1) of the no-fault act is applicable. Because we conclude that plaintiff's subrogation claim is governed instead by the six-year limitation period generally applicable to contract actions, we reverse.

I

Hatim Raja was seriously injured in an automobile accident on August 23, 1983, and died from his injuries on October 10, 1984. The medical expenses he incurred as a result of the accident were covered by two separate contracts of insurance. Raja was insured under a no-fault automobile insurance policy issued by plaintiff Auto Club Insurance Association, and he was also insured under a group major medical plan issued by defendant New York Life Insurance Company. As he was permitted to do under § 3109a of the no-fault act, Raja had elected to coordinate medical expense coverage under the two insurance contracts.

Following the accident, a dispute developed between the two carriers regarding which had the primary obligation to pay the insured's medical expenses. Although ACIA notified N Y Life, as well as the insured, that it considered its obligation secondary to that of N Y Life, it proceeded to pay all but one of the medical bills. Then, in August 1988, approximately four years after ACIA made its final benefit payment, it commenced this action against N Y Life, seeking reimbursement for the payments made.

N Y Life moved for summary disposition pursuant to MCR 2.116(C)(7), claiming that the suit was barred because it had not been filed within the one-year limitation period provided in § 3145(1):

An action for recovery of personal protection insurance benefits payable under this chapter for accidental bodily injury may not be commenced later than 1 year after the date of the accident causing the injury unless written notice of injury as provided herein has been given to the insurer within 1 year after the accident or unless the insurer has previously made a payment of personal protection insurance benefits for the injury. If the notice has been given or a payment has been made, the action may be commenced at any time within 1 year after the most recent allowable expense, work loss or survivor's loss has been incurred. [Emphasis added.]

It is undisputed that the action was not commenced within one year after payment by ACIA of the most recent allowable expense.

Denying the motion for summary disposition, the trial court found § 3145(1) inapplicable, reasoning that the suit brought by ACIA is not an action for personal protection insurance benefits, but rather is an action for health and accident benefits under the insurance contract issued by defendant N Y Life.

On appeal, however, the Court of Appeals reversed. Citing and quoting Badger State Mut Casualty Ins Co v Auto-Owners Ins Co, 128 Mich. App. 120, 127; 339 N.W.2d 713 (1983), the panel concluded that "`[n]o matter how one characterizes the plaintiff's action, it is, in effect, a suit for recovery of no-fault benefits paid.'" 187 Mich. App. 276, 278; 466 N.W.2d 711 (1990).

We granted leave to appeal. 439 Mich. 867 (1991).

II

As this Court explained in Shavers v Attorney General, 402 Mich. 554, 578-579; 267 N.W.2d 72 (1978), cert den 442 U.S. 934 (1978), the no-fault insurance act, MCL 500.3101 et seq.; MSA 24.13101 et seq., enacted in 1972,

was offered as an innovative social and legal response to the long payment delays, inequitable payment structure, and high legal costs inherent in the tort (or "fault") liability system. The goal of the no-fault insurance system was to provide victims of motor vehicle accidents assured, adequate, and prompt reparation for certain economic losses.

The Shavers Court also said:

The Legislature believed this goal could be most effectively achieved through a system of compulsory insurance, whereby every Michigan motorist would be required to purchase no-fault insurance or be unable to operate a motor vehicle legally in this state. Under this system, victims of motor vehicle accidents would receive insurance benefits for their injuries as a substitute for their commonlaw remedy in tort. [ Id. at 579. Emphasis in original.]

In keeping with the system's goal, the no-fault act encourages coordination of personal protection insurance benefits with overlapping health and accident coverage that protects the same insured under a separate insurance contract. Section 3109a provides:

An insurer providing personal protection insurance benefits shall offer, at appropriately reduced premium rates, deductibles and exclusions reasonably related to other health and accident coverage on the insured. The deductibles and exclusions required to be offered by this section shall be subject to prior approval by the commissioner and shall apply only to benefits payable to the person named in the policy, the spouse of the insured and any relative of either domiciled in the same household.

As the Court of Appeals has explained, when overlapping benefits are coordinated, the insured obtains the "required coverage at a lower rate, while the insurer's reduced profit is offset by the reduction in its potential liability." Auto-Owners Ins Co v Farm Bureau Mut Ins Co, 171 Mich. App. 46, 52; 429 N.W.2d 637 (1988).

Although Raja, the insured, had elected coordination in accordance with § 3109a, as earlier noted, each of his two insurers initially claimed that the other was primarily liable for his medical expenses. However, before the commencement of this action, our Court decided Federal Kemper Ins Co, Inc v Health Ins Administration, Inc, 424 Mich. 537; 383 N.W.2d 590 (1986). There, considering analogous circumstances, we held that the no-fault insurer's obligation is secondary to that of the health and accident insurance carrier. Thus, it was clear when this action was filed, and it is clear now that, absent a time-bar, N Y Life bears the primary obligation for Raja's medical expenses.

III

Despite its status as a no-fault insurer, ACIA maintains that its claim against N Y Life is not based on the no-fault act. Rather, ACIA'S position is that it has filed a common-law contract action as subrogee of Raja to recover benefits due him under the insurance contract issued by N Y Life. As this Court has explained:

"The doctrine of subrogation rests upon the equitable principle that one who, in order to protect a security held by him, is compelled to pay a debt for which another is primarily liable, is entitled to be substituted in the place of and to be vested with the rights of the person to whom such payment is made, without agreement to that effect." [ Machined Parts Corp v Schneider, 289 Mich. 567, 574; 286 N.W. 831 (1939), citing French v Grand Beach Co, 239 Mich. 575, 580; 215 N.W. 13 (1927).]

While subrogation is not available to a "mere volunteer," Smith v Sprague, 244 Mich. 577, 580; 222 N.W. 207 (1928), this Court has determined that where an insurance carrier pays the expenses of its own insured pursuant to an insurance contract, it is not a volunteer. DAIIE v Detroit Mut Automobile Ins Co, 337 Mich. 50; 59 N.W.2d 80 (1953). In addition to its contractual obligations, ACIA was subject to a variety of incentives imposed by the no-fault act that encourage the prompt payment of claims. For example, § 3142 requires a no-fault insurer to pay penalty interest of twelve percent on covered benefits that are not paid within thirty days of receipt of reasonable proof of loss. This penalty is in addition to statutory interest payable under MCL 600.6013; MSA 27A.6013. See Wood v DAIIE, 413 Mich. 573, 589; 321 N.W.2d 653 (1982). Further, § 3148 provides for assessment of attorney fees if the court finds that a no-fault insurer has unreasonably delayed in making benefit payments. Particularly in the light of such incentives, it is clear that ACIA was protecting its own interests and did not act as a volunteer when it paid the medical expenses of its insured. Persuaded that ACIA is entitled to invoke the doctrine of subrogation, we turn next to consider whether its claim for reimbursement is barred by § 3145(1).

IV

N Y Life concedes that, ordinarily, a subrogee has the same cause of action as the subrogor, and that if Raja or his estate had sued to recover health and accident benefits under the N Y Life contract, the action would not be governed by § 3145(1). However, N Y Life advances two arguments to support its position that this action by ACIA is time-barred.

First, N Y Life contends that such a result is required because ACIA seeks reimbursement for personal protection insurance benefits and § 3145(1) applies to all actions for the recovery of personal protection insurance benefits payable under the no-fault act. Second, N Y Life argues that § 3145(1) should apply because, in effect, it became a no-fault insurer when Raja coordinated his health and accident policy with his no-fault coverage. We shall consider each of these arguments in turn.

A

Finding § 3145(1) applicable on the ground that ACIA'S suit is for recovery of personal protection insurance benefits payable under the no-fault act, the Court of Appeals relied upon its earlier decision in Badger State v Auto-Owners, supra. There, a no-fault insurer paid personal protection insurance benefits for medical expenses arising out of an automobile accident and later learned that its insured was entitled to workers' compensation benefits because he had been injured in the course of his employment. Three years after the accident, the no-fault insurer sought reimbursement in a suit against the workers' compensation carrier, claiming that the latter was primarily obligated for the medical expenses associated with the employee's work-related injuries. Although the Badger State panel acknowledged that an action by the insured against the workers' compensation carrier would not have been time-barred, it concluded that the one-year limitation period of § 3145(1) nevertheless applied. Claiming that its focus was on the "subject matter" of the action, the panel stated that "[n]o matter how one characterizes the plaintiff's action, it is, in effect, a suit for recovery of no-fault benefits paid. . . ." 128 Mich. App. 127.

We disagree with the reasoning of the Badger State panel and with the conclusion of the Court of Appeals in this case. As the words of § 3145(1) clearly indicate, its one-year limitation period applies only to "[a]n action for recovery of personal protection insurance benefits payable under this chapter. . . ." Even though ACIA paid benefits pursuant to a no-fault policy, it does not follow that its present suit against N Y Life is an action to recover personal protection insurance benefits payable under the no-fault act. Rather, the nature of the present suit by ACIA, as subrogee, is determined by the nature of the claim that Raja would have had against N Y Life. As one authority has explained:

The identity of a cause of action is not changed by the subrogation of an insurer thereto. Thus, the subrogation results only in a change in the beneficial ownership of the cause and has no effect on the character or underlying basis of the cause of action.

The right of subrogation is purely derivative as the insurer succeeds only to the rights of the insured, and no new cause of action is created. In other words, the concept of subrogation merely gives the insurer the right to prosecute the cause of action which the insured possessed against anyone legally responsible for the latter's harm; and this is so even though the right of subrogation is expressly declared by statute. [16 Couch, Insurance, 2d (rev ed), § 61:37, pp 120-121.]

Likewise, as we have recognized in a similar context:

"Since the insured would have been able to recover from the primary carrier for a judgment in excess of policy limits caused by the carrier's wrongful refusal to settle, the excess carrier, who discharged the insured's liability as a result of this tort, stands in the shoes of the insured and should be permitted to assert all claims against the primary carrier which the insured himself could have asserted." [ Commercial Union Ins Co v Medical Protective Co, 426 Mich. 109, 118; 393 N.W.2d 479 (1986), quoting Commercial Union Assurance Cos v Safeway Stores, 26 Cal.3d 912, 917-918; 610 P.2d 1038 (1980). See also Farmers Ins Group v Progressive Casualty Ins Co, 84 Mich. App. 474, 485; 269 N.W.2d 647 (1978).]

In this case, ACIA, as subrogee, is asserting the insured's right to "maintain a cause of action against a primary insurer for the latter's bad-faith failure to [satisfy its policy obligations]." Commercial Union, 426 Mich. 119. It "is equitably subrogated to the position of the insured and acquires no lesser or greater rights than those held by the insured." Id. In these circumstances, we agree with reasoning provided by the Court of Appeals in Adams v Auto Club Ins Ass'n, 154 Mich. App. 186, 196; 397 N.W.2d 262 (1986):

[B]ecause defendant's action seeking recovery for amounts overpaid involves a common-law right of action, the limitation found in § 3145(1) is not applicable. Since there is no other statute of limitations directly applicable, the general six-year limitation period argued by defendant must be applied. Although we recognize that a strong argument to the contrary could be made, see Badger State Mut Casualty Ins Co v Auto-Owners Ins Co, [ supra,] we believe that plaintiff's argument tortures the language of § 3145 and the legislative intent in enacting that section in attempting to extend the limitation period found in that section to the facts of this case involving a common-law right of action. [See also Transamerica Ins Co v Peerless Industries (MASCO), 698 F. Supp. 1350 (WD Mich, 1988).]

Because a suit brought by Raja, the insured, against N Y Life to enforce its health and accident insurance contract would not be an "action for recovery of personal protection insurance benefits payable under [the no-fault act]," we believe it would distort the meaning and purpose of the statute to apply its brief limitation period to this common-law contract action. ACIA, as subrogee, stepped into the shoes of its insured and sued on the same claim that would have been available to its insured; thus, we conclude that the present action falls outside the scope of § 3145(1).

B

N Y Life alternatively argues that because Raja elected to coordinate his health and accident coverage with his no-fault policy, N Y Life became, in effect, a no-fault insurer, and that the benefits available to Raja under its coverage therefore were no-fault benefits within the meaning of § 3145(1). We disagree.

By its terms, § 3145(1) applies only to benefits "payable under this chapter." The health and accident benefits provided under the insurance contract issued by N Y Life were payable without regard to the no-fault act. As we said in LeBlanc v State Farm Mut Automobile Ins Co, 410 Mich. 173, 201; 301 N.W.2d 775 (1981):

[T]he fact that "other health and accident coverage" immediately follows a reference to "personal protection insurance benefits" [in § 3109a] compels a conclusion that "other health and accident coverage" clearly means coverage other than personal protection insurance benefits payable under any no-fault policy.

Indeed, to hold that coordinated health and accident benefits are no-fault benefits, subject to the requirements of the no-fault act, would subvert an important purpose of the coordination provision, § 3109a. In Federal Kemper Ins Co v Health Ins Administration, Inc, supra, 424 Mich. 550, we recognized that § 3109a was enacted as a means of controlling health care costs. One way of containing those costs is for an insurer to place dollar limits upon the amounts it will pay to doctors and hospitals for particular services. While health and accident carriers generally are free to establish such limits, a no-fault insurer is not. Only the statutory qualification of reasonableness limits the amount that must be paid by a no-fault carrier for covered medical expenses. Thus, as the Kemper Court concluded, "health care costs are contained by recognizing health [and accident] insurance as primary." Id.

Even though, as a result of coordination, the obligation of NY Life to provide benefits became primary, it does not follow that N Y Life was transformed into a no-fault insurer any more than it follows that the benefits due under its policy were transformed into no-fault benefits. We find support for this conclusion in Welton v Carriers Ins Co, 421 Mich. 571; 365 N.W.2d 170 (1984). There, we recognized that the relatively short limitation period in § 3145(1), which protects no-fault insurers against stale claims, is part of a comprehensive legislative scheme with the goal, inter alia, of protecting no-fault insureds by requiring the prompt payment of claims. Id. at 578-579. However, N Y Life is not governed by the act's provisions relating to prompt payment, even when benefits have been coordinated. For example, N Y Life is not subject to the act's statutory interest penalty if it fails to pay benefits quickly, and it is not required by the act to pay attorney fees incurred by its insured in an action to obtain no-fault benefits that have been unreasonably denied.

Just as coordination with a no-fault policy does not subject NY Life to these costly requirements of the no-fault act, coordination does not entitle N Y Life to invoke the relatively short limitation period of § 3145(1).

V

Because § 3145(1) of the no-fault act does not apply to plaintiff's common-law action as subrogee to recover benefits due under the health and accident insurance contract issued by defendant, we reverse the decision of the Court of Appeals.

CAVANAGH, C.J., and LEVIN, BRICKLEY, BOYLE, RILEY, and MALLETT, JJ., concurred with GRIFFIN, J.