Hennessey, C.J.
General Laws c. 175, § 47B, specifies mandatory minimum mental health care benefits for Massachusetts residents, which must be included in any general insurance policy, accident or sickness insurance policy, or employee health care plan, if the policy or plan covers hospital and surgical expenses.
The principal question before
us is whether § 47B is preempted by either the Employee Retirement Income Security Act, 29 U.S.C. §§ 1001 et seq. (1976, Supp. 1 1977, & Supp. II 1978) (ERISA), or the National Labor Relations Act, 29 U.S.C. §§ 151 et seq. (1976 & Supp. Ill 1979) (NLRA). In addition, the defendant insurance companies raise issues concerning severability, the effect of § 47B on policies issued before its effective date in 1976, and the applicability of the contract clause of the United States Constitution, art. 1, § 10. We conclude that the provisions of § 47B pertaining to insurance are not preempted, and that they are severable from a provision pertaining to employee benefit plans, which the parties have assumed to be preempted. We also conclude that § 47B applies to certain policies issued by the defendants before 1976, and that this application of the statute does not violate the contract clause.
The Attorney General brought this action for declaratory and injunctive relief to enforce § 47B against insurance companies that issue group insurance policies providing medical coverage to Massachusetts employees.
The parties stipulated that nearly all of the defendants’ group policies
covering Massachusetts employees insure welfare benefit plans subject to ERISA. In addition, a number of the policies insure plans mandated by collective bargaining agreements negotiated pursuant to the NLRA.
A Superior Court judge issued a preliminary order requiring the defendants to provide the mental health coverage described in § 47B. After trial, a second judge granted a permanent order to the same effect. We granted the defendants’ application for direct appellate review.
1.
Severability.
Although § 47B applies by its terms to “employees’ health and welfare fund[s],” as well as to policies of insurance, the Attorney General has not enforced it against uninsured plans subject to ERISA. The present case involves only insurers, and all parties have assumed that direct enforcement against plans is preempted by ERISA. A threshold question, therefore, is whether the provisions of § 47B requiring the inclusion of mental health care benefits in policies of insurance are severable from the provision pertaining directly to benefit plans. We believe that they are. The insurance requirements “have independent force, thus justifying the inference that the enacting body would have passed one without the other.”
DelDuca
v.
Town Adm’r of Methuen,
368 Mass. 1, 13 (1975). The judge’s findings indicate that many plans purchase insurance, and that § 47B as currently enforced (against insurers only) has brought about significant improvements in mental health care in Massachusetts. The judge also found that there was no credible evidence that partial enforcement of § 47B had caused plans to shift to self-insurance.
In light of our conclusion that the insurance provisions of § 47B are independently enforceable, the following discussion of preemption will be limited to the statute’s application to policies of insurance.
2.
Preemption
—
General Principles.
By the operation of the supremacy clause of the United States Constitution, art. 6, Federal law preempts conflicting State law.
Gibbons
v.
Ogden,
22 U.S. (9 Wheat.) 1,
210-211 (1824). The conflict may be direct, in the sense that State regulation contradicts Federal regulation, see
McDermott
v.
State,
228 U.S. 115, 132-134 (1913), or interferes with Federal policy, see
Burbank
v.
Lockheed Air Terminal, Inc.,
411 U.S. 624, 639 (1973), or it may arise from congressional intent, express or implied, to exclude all State regulation from a particular area. See
Commonwealth
v.
Federico,
383 Mass. 485, 489 (1981);
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504, 522-525 (1981);
Chicago & N.W. Transp. Co.
v.
Kalo Brick & Tile Co.,
450 U.S. 311, 324-326 (1981). See generally L. Tribe, American Constitutional Law 376-389 (1978). Preemption, however, is not favored, and State laws should be upheld unless a conflict with Federal law is clear. A finding of preemption must rest upon “persuasive reasons — either that the nature of the regulated subject matter permits no other conclusion, or that the Congress has unmistakably so ordained.”
Alessi
v.
Raybestos-Manhattan, Inc., supra
at 522, quoting from
Florida Lime & Avocado Growers
v.
Paul,
373 U.S. 132, 142, amended in other respects, 373 U.S. 929 (1963).
3.
Does ERISA Preempt
§ 47B?
Congress enacted ERISA in 1974 to protect the interests of beneficiaries of employee benefit plans. 29 U.S.C. § 1001 (1976).
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504, 510 (1981).
Nachman Corp.
v.
Pension Benefit Guaranty Corp.,
446 U.S. 359, 374-375 (1980). Prior Federal law
had preserved primary responsibility for regulation of benefit plans to the States. See
Malone
v.
White Motor Corp.,
435 U.S. 497, 505-512 (1978). See generally Hutchinson & Ifshin, Federal Preemption of State Law under the Employee Retirement Income Security Act of 1974, 46 U. Chi. L. Rev. 23, 25-30 (1978). In its place, ERISA outlined a detailed system for Federal regulation of benefit plan administration.
Alessi
v.
Raybestos-Manhattan, Inc., supra
at 510.
ERISA applies to two types of benefit plan — “pension plans,” which provide retirement benefits or deferred income;
and “welfare plans,” which provide nonpension benefits including medical and hospital expenses.
Wadsworth
v.
Whaland,
562 F.2d 70, 74 (1st Cir. 1977), cert. denied, 435 U.S. 980 (1978). ERISA’s regulatory provisions establish disclosure requirements and fiduciary standards applicable to both pension and welfare plans,
as well as funding and vesting requirements applicable only to pension plans.
Other sections of the act provide for enforcement and administration, and for national insurance against termination of pension plans. See generally Hutchinson & Ifshin,
supra
at 30-34.
ERISA also contains express provisions defining its preemptive effect on State law. Three provisions are relevant here. First, the act’s general preemption clause states in sweeping terms that ERISA supersedes all State laws that “relate to” employee benefit plans.
This general clause, however, is followed by a savings clause that exempts any State law that “regulates insurance” from the preemptive effect of the act.
The savings clause is limited in turn by a
third clause which provides that a State may not “deem” that a benefit plan is an insurer subject to its insurance laws.
The Attorney General argues that § 47B is a law that “regulates insurance,” and is therefore exempted from preemption by ERISA’s savings clause. The defendants argue that, because the purpose and effect of § 47B are to regulate benefits, it should not be saved from preemption as an insurance law.
Persuasive authority supports the Attorney General’s position. Both the United States Court of Appeals for the First Circuit and the Supreme Court of New Hampshire have rejected preemption challenges to a New Hampshire law nearly identical to § 47B.
Wadsworth
v.
Whaland,
562 F.2d 70 (1st Cir. 1977).
Metropolitan Life Ins. Co.
v.
Whaland,
119 N.H. 894 (1979). The defendants suggest that these decisions are not soundly reasoned, and have been undermined by a recent decision of the United States Supreme Court,
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504 (1981). We disagree. In light of the
Alessi
decision, however, we will set forth our reasoning in some detail.
We first address the language of ERISA’s preemption and savings provisions, to determine whether Congress has “unmistakably . . . ordained” preemption of § 47B.
Id.
at 522,
quoting
Florida Lime & Avocado Growers
v.
Paul,
373 U.S. 132, 142, amended in other respects, 373 U.S. 929 (1963). In
Alessi,
the Supreme Court adopted a broad construction of ERISA’s general preemption clause, holding that the clause applied to a New Jersey workers’ compensation law that prohibited set-offs of workmen’s compensation payments against pension benefits. The Court reasoned that the New Jersey statute was a law “relating] to” pension plans because it foreclosed a method of calculating pension benefits. 451 U.S. at 524-525. The Court added that “[i]t is of no moment that New Jersey intrudes indirectly, through a workers’ compensation law rather than directly, through a statute called‘pension regulation.’”
Id.
at 525. See also 29 U.S.C. § 1144 (c) (2) (1976).
The Court’s analysis in
Alessi
suggests that § 47B is a law that “relate [s] to” benefit plans, within ERISA’s general preemption clause. Because a plan that-purchases insurance has no choice but to provide mental health care benefits, the insurance provisions of § 47B effectively control the content of insured welfare benefit plans. Although grounds of distinction may exist between
Alessi
and the present case,
the Attorney General has not pressed them, and we treat § 47B as a law that “relate[s] to” employee benefit plans. See
Commonwealth
v.
Federico,
383 Mass. 488 (1981).
This brings us to the savings clause, which exempts “any law of any state which regulates insurance.” 29 U.S.C. § 1144 (b)(2)(A) (1976). The defendants insist that § 47B is not an insurance law, becuase it is designed to promote public health,
rather than to regulate “traditional” sub
jects of State insurance. The language of the savings clause, however, is not limited to “traditional” insurance laws, even if such a category could be defined. Contrast
Commonwealth
v.
Federico,
383 Mass. 485 (1981) (savings clause for “generally applicable” criminal laws). The only express limit on the savings clause is the third clause, sometimes called the “deemer” clause, which prevents States from deeming plans to be insurers. See
Wadsworth
v.
Whaland,
562 F.2d 70, 77-79 (1st Cir. 1977);
Metropolitan Life Ins. Co.
v.
Whaland,
119 N.H. 894, 902 (1979). On the other hand, we cannot agree with the Attorney General’s contention that our analysis should end with the deemer clause. In the Attorney General’s view, if § 47B applies to insurance, and does not treat plans as insurers, it is not preempted. See
Wadsworth
v.
Whaland, supra
at 77-78;
Metropolitan Life Ins. Co.
v.
Whaland, supra
at 902. We are wary of such a literal reading, which might permit the State, through its insurance laws, to reach far into areas governed by ERISA, and thereby negate the unmistakable intent of Congress to work a broad preemption. The deemer clause is one indication of the intended breadth of the savings clause, but we do not accept it as determinative. We conclude only that the language of the savings clause is broad enough to permit a construction that would exempt § 47B from preemption. Beyond this, the term “insurance law,” and the wording of the deemer clause are of little help.
We prefer to resolve the tension between the general preemption clause and the savings clause by reference to the policies and operation of ERISA, and the general principle that preemption should not be implied unless there is a clear conflict between State and Federal law.
Chicago & N.W. Transp. Co.
v.
Kalo Brick & Tile Co.,
450 U.S. 311, 317-318 (1981).
Jones
v.
Rath Packing Co.,
430 U.S. 519, 525-526 (1977). Congress, when it enacted ERISA, was
concerned with widespread abuses in plan administration, often resulting in employees’ losses of anticipated benefits. 29 U.S.C. § 1001 (a) (1976).
Wadsworth
v.
Whaland, supra
at 73-74. See
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504, 510 (1981). In response, Congress enacted rules governing disclosure and fiduciary conduct by administrators of welfare benefit plans.
29 U.S.C. §§ 1001 (b), 1021-1031, 1101-1114 (1976). Section 47B has no bearing on the problem of administrative abuse, and does not overlap or interfere with the means chosen by Congress to deal with such abuse. Section 47B affects only the substantive content of plans — a subject completely untouched by ERISA’s regulatory provisions. See
Gast
v.
State,
36 Or. App. 441, 452-458 (1978). Therefore, nothing in the practical relationship between the two statutes calls for an implied limitation on the phrase “regulates insurance” that would exclude § 47B from the protection of the savings clause.
The defendants discern an additional “policy” in ERISA’s preemption provisions. They suggest that Congress intended to designate an area of private self-determination with respect to choice of benefits, and to protect it from all State regulation. But the defendants have not identified persuasive evidence in the legislative history of an affirmative policy to curtail State police power in favor of private decision-making. See
Gast
v.
State, supra
at 457-458. To the contrary, comments during floor debates indicate that broad preemption language was favored in order to provide a clear line of demarcation and to deter States from enacting inconsistent laws on the periphery of ERISA’s subject matter.
Nor does the Supreme Court’s opinion in
Alessi, supra,
support the defendants’ view that Congress intended to establish strict protection of self-determination in an area outside the scope of ERISA’s regulatory provisions. In fact, the Court emphasized in its discussion of preemption that the New Jersey law at issue affected a subject covered by ERISA.
The defendants also contend that ERISA established a policy in favor of uniformity with respect to benefit plans, which would be undermined if States were permitted to impose varying requirements on the substantive content of
plans. The defendants point out that businesses that employ workers in a number of different States would be unable to adopt standardized plans covering all of their employees. We are not persuaded by this argument. Congress undoubtedly contemplated a system of uniform, national regulation in the areas governed by ERISA. On the other hand, it specifically approved State regulation in the fields of insurance, banking and securities, and so could not have intended to mandate complete uniformity for the convenience of multi-State employers. Moreover, the judge below stated in his findings that the defendants had presented “no credible evidence that [diverse State mandatory benefit laws] would be any more complex or burdensome to interstate commerce than various other . . . multi-state regulatory schemes such as workmen’s compensation laws.”
In sum, there is no conflict between § 47B and the policies or operation of ERISA that calls for a narrow interpretation of the phrase “regulates insurance” in the savings clause of ERISA’s preemption provisions. Therefore, we conclude that ERISA does not preempt § 47R.
4.
Does the NLRA Preempt
§
47BP
Congress enacted the NLRA in 1935 to combat industrial strife by encouraging collective bargaining on terms and conditions of employment. 29 U.S.C. § 151 (1976). The act protects employees’ rights to organize and to engage in concerted activity, and defines unfair labor practices by employers and unions. See 29 U.S.C. §§ 157-160 (1976). Certain of the insurance policies issued by the defendants insure plans agreed to through collective bargaining,
and the defendants contend that the NLRA preempts application of § 47R to these policies.
The issue of preemption takes a different form under the NLRA from that under ERISA. The NLRA does not pro
vide expressly for preemption of State law, as does ERISA. Thus, the NLRA’s preemptive effect must be discerned entirely by implication from the policies of the act. On the other hand, Congress clearly did intend, in enacting the NLRA, to mark off an area for autonomous private ordering by labor and management, free from most forms of regulation by either the National Labor Relations Board or the States.
Lodge 76, Int’l Ass’n of Machinists
v.
Wisconsin Employment Relations Comm’n,
427 U.S. 132, 140 (1976) (hereinafter
Machinists). Local 24, Int’l Bhd. of Teamsters
v.
Oliver,
358 U.S. 283, 295-296 (1959) (hereinafter
Oliver). NLRB
v.
American Nat'l Ins. Co.,
343 U.S. 395, 404 (1952). Apart from the limits set by Congress, both the economic tactics used during negotiations and the substantive terms of the resulting agreement are “left ‘to be controlled by the free play of economic forces.’”
Machinists, supra
at 140, quoting from
NLRB
v.
Nash-Finch Co.,
404 U.S. 138, 144 (1971). Therefore, when labor and management agree upon subjects of mandatory bargaining, the terms of their agreement “themselves become expressions of federal law, requiring preemption of intrusive state law.”
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504, 526 (1981).
Despite the breadth of its statements concerning the preemptive effect of collective bargaining agreements, the Supreme Court has recognized that Congress could not have
intended to preempt “all local regulation that touches or concerns in any way the complex interrelationships between employees, employers and unions; obviously, much of this is left to the States.”
Malone
v.
White Motor Corp.,
435 U.S. 497, 504 (1978), quoting from
Amalgamated Ass’n of St., Elec. Ry. & Motor Coach Employees
v.
Lockridge,
403 U.S. 274, 289 (1971). See
Massachusetts Council of Constr. Employers, Inc.
v.
Mayor of Boston,
384 Mass. 446, 472-473 (1981), cert. granted sub nom.
White
v.
Massachusetts Council of Constr. Employers, Inc.,
455 U.S. 919 (1982). Accordingly, the Court has acknowledged a number of exceptions to NLRA preemption, each based upon the probability that Congress did not intend to displace a particular type of State regulation. Preemption will not be implied when Congress has indicated in other Federal legislation that State law should govern a certain area,
or when “the activity regulated [is] a merely peripheral concern of the [NLRA].”
San Diego Bldg. Trades Council
v.
Garmon,
359 U.S. 236, 243 (1959).
The Court has also upheld State laws when “the regulated conduct touched interests . . . deeply rooted in local feeling and responsibility,”
id.
at
244,
and has suggested an exception for “local health or safety regulation[s],”
Oliver, supra
at 297.
Section 47B affects health benefits, a subject of mandatory collective bargaining. See
Allied Chem. & Alkali Workers Local No. 1
v.
Pittsburgh Plate Glass Co., Chem. Div.,
404 U.S. 157, 159 (1971). It does not, however, regulate labor-management relations as such; its purpose is to protect public health,
and its method is regulation of insurers and insurance policies. Ordinarily, preemption depends upon the
effect
of State law upon NLRA policy, and the fact that a State law is enacted for neutral purposes and applies outside the employment relationship cannot save it from preemption.
San Deigo Bldg. Trades Council
v.
Garmon,
359 U.S. 236, 244 (1959).
Oliver, supra
at 297.
See
John Hancock Mut. Life Ins. Co.
v.
Commissioner of Ins.,
349 Mass. 390, 400 (1965). See also
New York Tel. Co.
v.
New York State Dep’t of Labor,
440 U.S. 519, 550-551 (1979) (Blackmun, J., concurring, joined by Marshall, J.), 557-558 (Powell, J., dissenting, joined by Burger, C.J., and Stewart, J.). Nevertheless, the various exceptions described above suggest that the character and purpose of the State law may bear upon congressional intent to subordinate it to the NLRA’s policy of free collective bargaining.
At least two of the exceptions recognized by the Court are relevant to the validity of § 47B. The first of these is the exception for public health laws, suggested by the Court’s statement in
Oliver
that, “We have not here a case of a collective bargaining agreement in conflict with a local health or safety regulation; the conflict here is between the federally sanctioned agreement and state policy which seeks specifically to adjust relationships in the world of commerce.” 358 U.S. at 297. (See note 23,
supra.)
Section 47B appears to us to be the type of permissible health regulation envisioned by the Oliver court. Section 47B is designed to solve a serious health problem, rather than to alter the bargaining positions of unions and employers. It is unlikely that Congress intended, by enacting the NLRA, to bind the hands of State Legislatures with respect to problems such as mental health. And because § 47B is addressed to a Statewide health problem not peculiar to employment relationships, its exemption will not open a door to State interference with the “free play of economic forces” between labor and management. See Cox, Labor Law Preemption Revisited, 85 Harv. L. Rev. 1337, 1352 (1972).
A second indication that Congress did not intend the NLRA to preempt laws such as § 47B can be found in another Federal statute, the McCarran-Ferguson Act, 15 U.S.C. §§ 1011-1015 (1976).
Wadsworth
v.
Whaland,
562 F.2d 70, 79 n.44 (1st Cir. 1977).
Metropolitan Life Ins. Co.
v.
Whaland,
119 N.H. 894, 905-906 (1979). See
Malone
v.
White Motor Corp.,
435 U.S. 497 (1978). See also note 20,
supra.
The McCarran-Ferguson Act establishes a congres
sional policy in favor of State regulation of insurance, and provides that “No Act of Congress shall be construed to invalidate, impair, or supersede any law enacted by any state for the purpose of regulating the business of insurance.” 15 U.S.C. § 1012 (b) (1976). Although the purposes and effect of § 47B extend beyond regulation of insurance as such, the statute operates upon insurance and insurance policies. The McCarran-Ferguson Act does not contain a limiting definition of the term “business of insurance,” see
SEC
v.
National Sec., Inc.,
393 U.S. 453, 460 (1969), and we do not believe that conflict between § 47B and the NLRA is serious enough to call for a narrow reading that would exclude § 47B from the act’s protection.
Finally, § 47B is not an absolute limit on the parties’ freedom to negotiate the terms of employee health plans. The provisions of § 47B now before us apply to insurers. They do not mandate the inclusion of mental health benefits in employee plans unless the parties decide to purchase insurance. In view of the need to accommodate the “separate spheres of governmental authority preserved in our federalist system,”
Alessi
v.
Raybestos-Manhattan, Inc.,
451 U.S. 504, 522 (1981), we hesitate to extend the implied preemptive reach of the NLRA to such a law.
In sum, § 47B imposes some limits on the freedom of labor and management to bargain for health benefit terms, but does so only as an incident of the parties’ decision to purchase insurance. At least two of the factors that the Supreme Court has identified as indicia of congressional intent to tolerate particular State legislation despite its effect on collective bargaining pertain to § 47B. Applying the principle
that an “exercise of federal supremacy is not lightly to be presumed,”
id.,
quoting
Schwartz
v.
Texas,
344 U.S. 199, 203 (1952), we conclude that the NLRA does not preempt §47B.
5.
Application of
§
47B to Policies Issued Before 1976.
The defendants’ final contention is that § 47B does not and cannot apply to certain policies issued before its effective date (January 1, 1976), under which termination or renewal is at the option of the policyholder. These policies either do not permit the defendants to refuse to continue coverage, or permit refusal in limited circumstances only. All of the policies, however, authorize the defendants to raise premium rates. The judge found that since January, 1976, the defendants have raised premium rates for almost all policies, and that in many instances the parties have altered benefit coverage as well. The judge ordered the defendants to provide the benefits required by § 47B under policies that were “issued prior to January 1, 1976, but. . . have been
altered or renewed through any change in premium or benefits”
(emphasis added). We interpret this order to require the defendants to provide benefits from the date of alteration under policies altered since January 1, 1976.
Section 47B applies by its terms to policies “issued or subsequently
renewed by agreement between the insurer and the policyholder”
after its effective date (emphasis added). We agree with the judge that “renew[al] by agreement” includes changes in benefits or premiums. A change in benefit coverage is in effect an agreement to a new policy, whatever the label applied by the parties. An insurer’s decision to raise premiums presents a closer question; the insurer has not actually assented to continued coverage. Nevertheless, we believe that an insurer’s adjustment of its compensation, coupled with the insured’s acceptance of the new rates, amounts to renewal for purposes of § 47B. Section 47B is designed to enable as many Massachusetts residents as possible to receive mental health coverage. The provision limiting its application to policies newly issued or renewed is best read as a measure to ensure that insurance companies can adjust their rates to reflect the new risks imposed.
This application of § 47B does not conflict with the contract clause of the United States Constitution, art. 1, § 10. Although the Supreme Court has confirmed in recent decisions that the contract clause imposes substantial limits on the power of States to alter contractual obligations, it remains clear that the prohibition against impairment of contract is not absolute. See
Allied Structural Steel Co.
v.
Spannaus,
438 U.S. 234 (1978);
United States Trust Co.
v.
New Jersey,
431 U.S. 1 (1977). Private contract rights are subject to reasonable and necessary legislation in furtherance of important public interests, and legislative judgments concerning reasonableness and necessity are entitled to deference.
Allied Structural Steel Co.
v.
Spannaus, supra
at 244.
United States Trust Co.
v.
New Jersey, supra
at 22-23. The Supreme Court has approached issues arising under the contract clause by assessing the relative weight of the impairment and the State’s interest in enacting the impairing legislation.
See Allied Structural Steel Co.
v.
Spannaus, supra
at 244-250.
The impairment wrought by § 47B is minimal. The defendants must provide insurance against a risk they did not assume in the original policies. The risk imposed by § 47B, however, does not affect the defendants retroactively; benefits are due only from the date on which the policies were issued or amended, and in no case before the effective date of the statute. Contrast
American Mfrs. Mut. Ins. Co.
v.
Commissioner of Ins.,
374 Mass. 181 (1978) (mandatory premium rebates);
Allied Structural Steel Co.
v.
Spannaus, supra
(increased pension liability). Moreover, the defendants’ policies permit them to counteract the new risk by raising premium rates. Contrast
Allied Structural Steel Co.
v.
Spannaus, supra
at 246-247. Thus, the defendants — participants in a heavily regulated industry —
cannot complain of a serious interference with their reasonable expectations.
The State interest supporting § 47B — protection of the public health — is an important one, and the means selected to further it are reasonable. Section 47B applies generally to all insurers that issue policies to Massachusetts residents. Contrast
Allied Structural Steel Co.
v.
Spannaus, supra
at 250. Its application to policies altered after January 1, 1976, is reasonable and necessary to accomplish its objective of ensuring broad mental health coverage. Exclusion of such policies would permit insurance companies to avoid much of the effect of future insurance laws at no cost, by entering contracts characterized as perpetual, while retaining the right to raise premium rates. Without determining the full extent to which the State’s interest in a broad application of mandatory benefit laws would justify impairment of private contracts, we believe that it overrides the minimal private interests here at stake.
We conclude that the application of § 47B at issue is severable from the application of § 47B that the parties have assumed to be invalid, and is not preempted by ERISA or the NLRA. With respect to policies issued since January 1, 1976, the judge correctly ordered the defendants to comply with § 47B from the date of issuance. With respect to policies issued before January 1, 1976, and altered or renewed through any change in premium or benefits after January 1, 1976, the judge correctly ordered the defendants to comply from the date of alteration.
Judgment affirmed.