
948 P.2d 700 (1997)
David RUCKDASCHEL, Sr., and Tami Ruckdaschel, Plaintiffs and Respondents,
v.
STATE FARM MUTUAL AUTOMOBILE INSURANCE CO., Defendant and Appellant.
No. 97-194.
Supreme Court of Montana.
Submitted on Briefs September 17, 1997.
Decided November 13, 1997.
Susan P. Roy, Garlington, Lohn & Robinson, Missoula, for Defendant and Appellant.
*701 William P. Joyce, Burgess, Joyce, Starin & Whelan, Butte, for Plaintiffs and Respondents.
TRIEWEILER, Justice.
The plaintiffs, Tami and David Ruckdaschel, brought this action against the defendant, State Farm Mutual Automobile Insurance Co., in the District Court for the Second Judicial District in Silver Bow County to obtain coverage for medical payments pursuant to their policies with State Farm. Both parties moved for summary judgment. The District Court granted the Ruckdaschels' motion as it pertained to coverage issues, and held that genuine issues of material fact exist regarding other claims. State Farm appeals from the District Court's order. We affirm the judgment of the District Court.
The issue on appeal is:
Does State Farm's anti-stacking language in the medical payment portion of the Ruckdaschels' policy violate Montana public policy?

FACTUAL BACKGROUND AND DISCUSSION
This appeal initially involved two separate automobile accidents. The first occurred on April 27, 1994. In that accident, Tami Ruckdaschel was injured while riding as a passenger in her husband's 1993 Chevrolet truck when it was struck by a vehicle driven by Rod Timmer. She incurred medical expenses in the amount of $5,725.08 as a result of this accident. State Farm paid $5,000 toward those expenses. On appeal, Tami has moved this Court to dismiss her claim related to that accident, given the amount of money in controversy. Although State Farm objects to that motion, we grant Tami's motion to dismiss. Therefore, State Farm's appeal with regard to the issue of coverage for Tami's April 27, 1994, accident is moot. In State v. Murray (1979), 183 Mont. 499, 503, 600 P.2d 1174, 1176, we held that "[a] moot question is one which existed once but because of an event or happening, it has ceased to exist and no longer presents an actual controversy." This Court will not decide moot questions and therefore will not address State Farm's appeal regarding Tami's claim for medical payment benefits arising out of the April 27, 1997, accident. See Murray, 183 Mont. at 503, 600 P.2d at 1176.
The second accident occurred on October 16, 1994. In that accident, Tami was injured when struck as a pedestrian by a vehicle driven by Neil Gordon. She incurred medical expenses in excess of $15,000 as a result of those injuries.
Tami had three separate medical payment policies in effect with State Farm at the time of the accident. She paid a separate premium for each of those coverages. Each policy had a limit of $5,000 for medical payment coverage. However, State Farm refused to pay more than the single limit of $5,000. The District Court held that the coverages may be "stacked" and ordered State Farm to pay the additional $10,000.
Each of Tami's three policies in effect at the time of the October 16, 1994, accident contained the following coverage language:
We will pay medical expenses for bodily injury sustained by:
1. a. the first person named; and
b. his or her relatives.
These persons have to sustain the bodily injury:

a. while they operate or occupy a vehicle covered under the liability section; or
b. through being struck as a pedestrian by a motor vehicle or trailer.
(Underlining added.)
Although this language provides coverage pursuant to each of the three policies for the injuries Tami sustained in the October accident, State Farm added the following language in an amendatory endorsement to each policy:
2. Policies Issued by Us to You, Your Spouse or Relatives
If two ore [sic] more policies issued by us to you, your spouse or your relatives provide vehicle medical payments coverage and apply to the same bodily injury sustained;
a. while occupying a non-owned car, a temporary substitute car; or

*702 b. as a pedestrian

the total limits of liability under all such policies shall not exceed that of the policy with the highest limit of liability.
On appeal, State Farm contends that the District Court erred when it concluded that our decision in Bennett v. State Farm Is. Co. (1993), 261 Mont. 386, 862 P.2d 1146, allowed stacking of medical payment coverage in spite of the cited language. It contends that because medical payment coverage is not required by law, the rationale from Bennett is inapplicable. It further contends that because other jurisdictions have upheld similar or identical language with regard to medical payment coverage, the District Court erred when it chose to follow our decision in Bennett. The Ruckdaschels contend, on the other hand, that our decision in Bennett controls the outcome of this case and that the District Court was correct to follow that decision.
Our standard of review in appeals from summary judgment rulings is de novo. See Motarie v. Northern Montana Joint Refuse Disposal Dist. (1995), 274 Mont. 239, 242, 907 P.2d 154, 156; Mead v. M.S.B., Inc. (1994), 264 Mont. 465, 470, 872 P.2d 782, 785. When we review a summary judgment, we apply the same criteria as the district court based on Rule 56, M.R.Civ.P. See Bruner v. Yellowstone County (1995), 272 Mont. 261, 264, 900 P.2d 901, 903.
The essential question presented by this appeal is whether State Farm may rely on the language of its amendatory endorsement to deny coverage under each policy when it received a separate premium for each policy. In Bennett, we addressed a nearly identical question. The only difference between the facts of this case and the facts of Bennett is that Bennett involved underinsurance coverage and this case involves medical payment coverage. All other facts are identical: Bennett dealt with a pedestrian/automobile accident as does this case; Bennett involved a plaintiff who had purchased multiple insurance policies with identical coverages, just as the Ruckdaschels had done in this case; in Bennett, as in this case, the insurance company charged and was paid a separate premium for each policy; and, finally, in Bennett, as in this case, State Farm sought to prohibit stacking of an optional coverage by relying on the following "anti-stacking" language: "The total limits of liability under all such coverages shall not exceed that of the coverage with the highest limit of liability." Bennett, 261 Mont. at 388, 862 P.2d at 1148. Based on the facts in Bennett, we held that this "anti-stacking" provision is unenforceable as a violation of Montana's public policy.
In Bennett, we articulated Montana's public policy as follows: "[A]n insurer may not place in an insurance policy a provision that defeats coverage for which the insurer has received valuable consideration." Bennett, 261 Mont. at 389, 862 P.2d at 1148. Although stated most recently in Bennett, this Court has consistently upheld and relied upon this public policy for the past twenty-five years. See, e.g., Grier v. Nationwide Ins. Co. (1991), 248 Mont. 457, 812 P.2d 347; Sayers v. Safeco Ins. Co. (1981), 192 Mont. 336, 628 P.2d 659; Chaffee v. U.S. Fidelity & Guaranty Co. (1979), 181 Mont. 1, 591 P.2d 1102; Sullivan v. Doe (1972), 159 Mont. 50, 495 P.2d 193. We agree with the Ruckdaschels that Bennett is applicable here and, therefore, apply that same public policy to the facts of this case.
In Montana, an insurer is not allowed to deny coverage for which it has received valuable consideration. See Bennett, 261 Mont. at 389, 862 P.2d at 1148. It is undisputed that the Ruckdaschels paid a premium for each of the three policies in effect at the time of Tami's October 1994 accident. It is also undisputed that each of the Ruckdaschels' policies provided for medical payment coverage for pedestrian accidents, such as the accident in which Tami was involved. Because State Farm received valuable consideration for each policy, we conclude that State Farm cannot now refuse to pay benefits due pursuant to each policy. To hold otherwise would deny State Farm's insured the benefit of the coverage that she purchased.
In Bennett, State Farm argued that the cases which articulate Montana's public policy apply only to coverage which insurance companies are required by statute to offer to all their customers, and not "optional" types of coverage such as medical payment and underinsured motorist coverage. We disagreed with State Farm in Bennett because *703 the public policy of this state favors adequate compensation for accident victims when the tort-feasor does not provide adequate indemnification. See Bennett, 261 Mont. at 389, 862 P.2d at 1148. We further held, as we do here, that the absence of a statutory requirement for that type of coverage is irrelevant because the public policy considerations which invalidate contractual anti-stacking provisions in mandatory insurance coverage also support invalidating those provisions in an optional type of insurance coverage. See Bennett, 261 Mont. at 389, 862 P.2d at 1148. Therefore, we conclude that the District Court did not err when it held that the public policy concerns which apply in statutorily required insurance coverage contexts also apply to optional types of insurance coverage such as, in this case, medical payment coverage.
For these reasons, we affirm the judgment of the District Court related to coverage for injuries sustained by Tami Ruckdaschel on October 16, 1994, and dismiss her claim for additional coverage for injuries sustained on April 27, 1994.
We remand to the District Court for further proceedings consistent with this opinion.
TURNAGE, C.J., and LEAPHART, REGNIER and HUNT, JJ., concur.
