Spina, J.
Clarendon National Insurance Company (Clarendon) commenced an action seeking a declaration that the coverage afforded under the automobile liability insurance policies it issued to nine rental car companies was excess over any other valid and collectible insurance available to rental customers under their personal motor vehicle insurance policies. Clarendon based its claim on two policy endorsements that it had failed to file with the Commissioner of Insurance (commissioner), and on provisions of the rental agreements signed by its customers. The defendants included sixteen insurance companies whose insureds were involved in nineteen different accidents while driving cars rented from car rental companies insured by Clarendon. The defendant insurers have argued that Clarendon’s policy endorsements are void because they were not filed with the commissioner, as required by G. L. c. 175, §§ 22A, 113A, and 192, and that in any event the Clarendon motor vehicle liability policies must provide primary coverage as a matter of law because the accidents occurred while the rental customers were driving cars owned by Clarendon’s insureds and for which Clarendon issued motor vehicle liability policies.
On cross motions for summary judgment, a judge in the Superior Court ordered judgment for the defendants Commercial [250]*250Union, CGU, Commerce, and Premier Insurance Companies,2 ruling that because Clarendon failed to file the two policy endorsements with the commissioner pursuant to G. L. c. 175, §§ 22A, 113A, and 192, the endorsements are void, but the policies Clarendon issued to the rental car companies are otherwise valid and must be construed as if the two endorsements “do not exist.” Clarendon appealed and we transferred the case here on our own motion. We affirm the judgment, but hold that G. L. c. 175, § 193, treats the illegally issued endorsements as valid for- the limited purpose of protecting Clarendon’s insureds from an interruption in coverage, and it requires that coverage thereunder be consistent with the requirements of G. L. c. 175.
1. Facts. The facts are not disputed. In 1996, 1997, and 1998, Clarendon issued business automobile insurance policies to nine rental car companies in Massachusetts. Rental customers of the companies were involved in nineteen accidents while driving their rented automobiles. Each customer owned his or her own automobile, which was insured under a standard Massachusetts automobile liability insurance policy issued by a defendant insurer.3 As a result of each accident, a person injured, or one of the defendant insurers as subrogee of an injured person, submitted a claim for bodily injury, medical expenses, lost wages, or property damage to Clarendon as insurer of the rented car involved in the accident. Clarendon paid some, but not all, claims, and reserved its rights. It seeks a declaration that, as to all claims, each rental customer’s individual policy coverage must be exhausted before Clarendon is obligated to pay under its policy, and that it is entitled to reimbursement for each claim it has paid or may pay. Each Clarendon policy includes a Massachusetts mandatory endorsement (MM 9911 07 94), which states, in part:
[251]*251“E. ADDITIONAL CONDITIONS
“2. If anyone is entitled to PERSONAL INJURY PROTECTION benefits and also to benefits under any other insurance provided by this policy, we will pay from this insurance first” (emphasis added).
In addition, each Clarendon policy includes a business auto coverage form, approved by the commissioner, that states, in part:
“SECTION IV — BUSINESS AUTO CONDITIONS
“B. General Conditions.
“5. Other Insurance
“a. For any covered ‘auto’ you own, this Coverage Form provides primary insurance. For any covered ‘auto’ you don’t own, the insurance provided by this Coverage Form is excess over any other collectible insurance.” (Emphasis added.)
Each Clarendon policy contains two endorsements that purport to modify the above quoted policy provisions. These endorsements were not filed with the commissioner pursuant to G. L. c. 175, §§ 22A, 113A, and 192. Endorsement No. 3 states, in part:
“SECTION n — LIABILITY COVERAGE
“C. LIMIT OF INSURANCE.
“The limit of our Uability for the insurance provided by this endorsement for the rentee, is the minimum limit required by any applicable compulsory or financial responsibility law, unless endorsed hereon. This Insuranee provided by this endorsement is excess over any other collectible insurance (whether primary, excess or contingent)” (emphasis added).
“SECTION IV — BUSINESS AUTO CONDITIONS
“B. General Conditions
“5. Other Insurance
“For any covered auto, the insurance provided by [252]*252this policy is excess over any other collectible insurance whether primary, excess or contingent” (emphasis added).
“B. 5. d. The insurance provided by this policy for the rentee is subject to the terms, conditions, restrictions and limitations contained in the rental agreement...” (emphasis added).
Endorsement No. 2 states, in part:
“The insurance provided for any lessee or rentee under this policy is subject to the terms of the lease or rental agreement, including any limit of liability or conditions, restrictions and limitations contained therein.” (Emphasis added.)
The rental agreements used by the different rental companies are not uniform, but state variously that the insurance provided by the rental car company is “excess insurance over” or “secondary” to the customer’s own policy, or that the rental company provides no automobile liability insurance coverage for the rental customer. One rental agreement is silent on the matter but contains the customer’s certification that he maintains an automobile liability insurance policy with minimum coverage limits required by law.
Each customer owned his or her own personal automobile for which one of the defendant insurers issued a standard sixth edition Massachusetts automobile liability insurance policy with coverage for bodily injury, personal injury protection, and property damage required by G. L. c. 90, §§ 34A and 340. See note 3, supra. As to both bodily injury and property damage the policies state, in part:
“[I]f someone covered under this Part is using an auto he or she does not own at the time of the accident, the owner’s auto insurance must pay its limits before we pay” (emphasis added).
2. Discussion. Clarendon argues that the motion judge erred by concluding that endorsements no. 2 and no. 3 have no effect because they were not filed with the commissioner pursu[253]*253ant to G. L. c. 175, §§ 22A,4 113A,5 and 192.6 Clarendon contends that, although not filed with the commissioner, endorsements no. 2 and no. 3 are effective by operation of G. L. c. 175, § 193, which states:
“Any policy of insurance . . .
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Spina, J.
Clarendon National Insurance Company (Clarendon) commenced an action seeking a declaration that the coverage afforded under the automobile liability insurance policies it issued to nine rental car companies was excess over any other valid and collectible insurance available to rental customers under their personal motor vehicle insurance policies. Clarendon based its claim on two policy endorsements that it had failed to file with the Commissioner of Insurance (commissioner), and on provisions of the rental agreements signed by its customers. The defendants included sixteen insurance companies whose insureds were involved in nineteen different accidents while driving cars rented from car rental companies insured by Clarendon. The defendant insurers have argued that Clarendon’s policy endorsements are void because they were not filed with the commissioner, as required by G. L. c. 175, §§ 22A, 113A, and 192, and that in any event the Clarendon motor vehicle liability policies must provide primary coverage as a matter of law because the accidents occurred while the rental customers were driving cars owned by Clarendon’s insureds and for which Clarendon issued motor vehicle liability policies.
On cross motions for summary judgment, a judge in the Superior Court ordered judgment for the defendants Commercial [250]*250Union, CGU, Commerce, and Premier Insurance Companies,2 ruling that because Clarendon failed to file the two policy endorsements with the commissioner pursuant to G. L. c. 175, §§ 22A, 113A, and 192, the endorsements are void, but the policies Clarendon issued to the rental car companies are otherwise valid and must be construed as if the two endorsements “do not exist.” Clarendon appealed and we transferred the case here on our own motion. We affirm the judgment, but hold that G. L. c. 175, § 193, treats the illegally issued endorsements as valid for- the limited purpose of protecting Clarendon’s insureds from an interruption in coverage, and it requires that coverage thereunder be consistent with the requirements of G. L. c. 175.
1. Facts. The facts are not disputed. In 1996, 1997, and 1998, Clarendon issued business automobile insurance policies to nine rental car companies in Massachusetts. Rental customers of the companies were involved in nineteen accidents while driving their rented automobiles. Each customer owned his or her own automobile, which was insured under a standard Massachusetts automobile liability insurance policy issued by a defendant insurer.3 As a result of each accident, a person injured, or one of the defendant insurers as subrogee of an injured person, submitted a claim for bodily injury, medical expenses, lost wages, or property damage to Clarendon as insurer of the rented car involved in the accident. Clarendon paid some, but not all, claims, and reserved its rights. It seeks a declaration that, as to all claims, each rental customer’s individual policy coverage must be exhausted before Clarendon is obligated to pay under its policy, and that it is entitled to reimbursement for each claim it has paid or may pay. Each Clarendon policy includes a Massachusetts mandatory endorsement (MM 9911 07 94), which states, in part:
[251]*251“E. ADDITIONAL CONDITIONS
“2. If anyone is entitled to PERSONAL INJURY PROTECTION benefits and also to benefits under any other insurance provided by this policy, we will pay from this insurance first” (emphasis added).
In addition, each Clarendon policy includes a business auto coverage form, approved by the commissioner, that states, in part:
“SECTION IV — BUSINESS AUTO CONDITIONS
“B. General Conditions.
“5. Other Insurance
“a. For any covered ‘auto’ you own, this Coverage Form provides primary insurance. For any covered ‘auto’ you don’t own, the insurance provided by this Coverage Form is excess over any other collectible insurance.” (Emphasis added.)
Each Clarendon policy contains two endorsements that purport to modify the above quoted policy provisions. These endorsements were not filed with the commissioner pursuant to G. L. c. 175, §§ 22A, 113A, and 192. Endorsement No. 3 states, in part:
“SECTION n — LIABILITY COVERAGE
“C. LIMIT OF INSURANCE.
“The limit of our Uability for the insurance provided by this endorsement for the rentee, is the minimum limit required by any applicable compulsory or financial responsibility law, unless endorsed hereon. This Insuranee provided by this endorsement is excess over any other collectible insurance (whether primary, excess or contingent)” (emphasis added).
“SECTION IV — BUSINESS AUTO CONDITIONS
“B. General Conditions
“5. Other Insurance
“For any covered auto, the insurance provided by [252]*252this policy is excess over any other collectible insurance whether primary, excess or contingent” (emphasis added).
“B. 5. d. The insurance provided by this policy for the rentee is subject to the terms, conditions, restrictions and limitations contained in the rental agreement...” (emphasis added).
Endorsement No. 2 states, in part:
“The insurance provided for any lessee or rentee under this policy is subject to the terms of the lease or rental agreement, including any limit of liability or conditions, restrictions and limitations contained therein.” (Emphasis added.)
The rental agreements used by the different rental companies are not uniform, but state variously that the insurance provided by the rental car company is “excess insurance over” or “secondary” to the customer’s own policy, or that the rental company provides no automobile liability insurance coverage for the rental customer. One rental agreement is silent on the matter but contains the customer’s certification that he maintains an automobile liability insurance policy with minimum coverage limits required by law.
Each customer owned his or her own personal automobile for which one of the defendant insurers issued a standard sixth edition Massachusetts automobile liability insurance policy with coverage for bodily injury, personal injury protection, and property damage required by G. L. c. 90, §§ 34A and 340. See note 3, supra. As to both bodily injury and property damage the policies state, in part:
“[I]f someone covered under this Part is using an auto he or she does not own at the time of the accident, the owner’s auto insurance must pay its limits before we pay” (emphasis added).
2. Discussion. Clarendon argues that the motion judge erred by concluding that endorsements no. 2 and no. 3 have no effect because they were not filed with the commissioner pursu[253]*253ant to G. L. c. 175, §§ 22A,4 113A,5 and 192.6 Clarendon contends that, although not filed with the commissioner, endorsements no. 2 and no. 3 are effective by operation of G. L. c. 175, § 193, which states:
“Any policy of insurance . . . issued in violation of any provision of this chapter shall be valid and binding upon the company issuing it, and the rights, duties and obligations of the parties thereto shall be determined by this chapter.”
Clarendon relies on Hewins v. London Assurance Corp., 184 Mass. 177 (1903), where the court applied St. 1894, c. 522, §§ 60, 105, a predecessor to G. L. c. 175, § 193, to a fire insurance policy that did not comply with the standard statutory form policy or permissible variations. The 1894 statute stated that no company could issue a policy that conflicted with the statutory form, and any offending company would be subject to [254]*254a fine.7 The 1894 statute further provided that any such policy would be binding on the company. Id. at 183. The court held that because the statute contained no rule of interpretation of a policy issued contrary to law, “[t]he penalty suffered by the company is a fine, and not a liability to be held on a contract different from that made by it” (emphasis added). Id. at 184.
We agree with Clarendon that, contrary to the ruling of the motion judge, the endorsements are not without existence, despite Clarendon’s failure to file them with the commissioner. Section 193, made applicable to endorsements no. 2 and no. 3 by § 192, like its 1894 predecessor makes illegally issued endorsements “valid and binding” on the company. Unlike the 1894 statute, however, § 193 contains a rule of interpretation of illegally issued policies and endorsements: “the rights, duties and obligations of the parties [to the policy] shall be determined by [G. L. c. 175].” This language, as the Hewins case suggests, can leave an insurer “liabl[e] on a contract different from that made by it.” Id. at 184. We conclude that endorsements no. 2 and no. 3, although issued in violation of G. L. c. 175, §§ 22A, 113A, and 192, are binding on Clarendon, as between it and its insureds. However, to the extent that the endorsements are inconsistent with G. L. c. 175 they can have no effect, and Clarendon’s policy (with endorsements) will be construed as conforming with G. L. c. 175.
The question remains, however, whether, as Clarendon implies, § 193 validates illegally issued policies for all purposes, an issue that was not argued or decided in the Hewins case. Clarendon contends that its endorsements are not inconsistent with G. L. c. 175 or any regulation promulgated thereunder because there is no requirement that an owner’s policy provide primary coverage, and therefore the endorsements are valid by operation of § 193.8 Clarendon’s argument [255]*255assumes that § 193 operates to cure, for all purposes, its failure to obtain the commissioner’s approval of its endorsements before they were issued. Section 193 has no such effect. It gives the endorsements limited validity for the purpose of protecting Clarendon’s insureds against an interruption in coverage, and by its own terms it affects only the relationship between the issuer and its insured. It has no effect on the commissioner. Section 193 does not alter the status of Clarendon’s endorsements as lacking the approval of the commissioner.
When considering the effect of the illegally issued endorsements on third parties, § 193 must be read in harmony with related provisions of G. L. c. 175 so that the statutory scheme, as a whole, is internally consistent. See Massachusetts Ass’n of Ins. Agents v. Commissioner of Ins., 425 Mass. 477, 481 (1997). A condition precedent to the validity of endorsements no. 2 and no. 3 is that they be filed with the commissioner under G. L. c. 175, §§ 22A and 113A. The commissioner then has thirty days to approve or disapprove the endorsements in writing, or constructively approve them by taking no action within thirty days of filing. The commissioner’s authority to approve all policies and endorsements before they may be issued is an integral component of her authority to set the language of compulsory motor vehicle liability policies, which we have recognized as necessary and incidental to her power to fix the rates for compulsory coverage under G. L. c. 175, § 113B. See Liberty Mut. Ins. Co. v. Commissioner of Ins., 395 Mass. 765, 771 (1985). Under the existing statutory scheme, only the commissioner may approve a policy, either expressly or by default.
The reading of § 193 that Clarendon urges would effectively subvert the statutory scheme created for fixing compulsory motor vehicle liability insurance coverage rates. It would permit an insurer unilaterally to issue a policy that effectively overrides the standard policy language required of all other carriers, and in doing so alter the cornerstone on which the commissioner relies to set automobile insurance rates for the entire industry.9 [256]*256Certainly the Legislature did not intend § 193 to produce such a result. Rather, § 193 validates illegally issued policies for the limited purpose of protecting the issuer’s insureds, as discussed. Because the endorsements were illegally issued, they have no effect on the policies approved by the commissioner and issued by the defendant insurers, and they are effectively void for purposes of this litigation.
Judgment affirmed.