¶1. This case comes before the court on certification from District I of the court of appeals. Petitioners, Susan and Gary Czapin-ski, seek review of a circuit court decision that dismissed their medical malpractice claim on the grounds that they failed to state a claim upon which relief could be granted. Petitioners had sought damages for the loss of their mother's society and companionship following her death during a routine hip replacement surgery. The circuit court held that under Wis. Stat. § 893.55(4)(f) (1995-96), 1 adult children lack standing to recover for the wrongful death of a parent caused by medical malpractice.
¶ 2. We affirm. First, we hold that the language of Wis. Stat. § 893.55(4)(f) makes applicable to medical malpractice death cases only the limit on damages, and does not incorporate the wrongful death classification of claimants entitled to bring such an action. The clas *320 sification of claimants entitled to bring a wrongful death suit for medical malpractice is limited to those enumerated in Wis. Stat. § 655.007. Legislative history shows that adult children were not intended to be included within this classification. Second, we hold that § 893.55(4)(f) does not violate the equal protection clause of the Wisconsin Constitution.
I.
¶ 3. On October 19, 1995, seventy-eight-year-old Helen Czapinski was admitted to St. Francis Hospital to undergo routine hip replacement surgery. During the surgery, doctors had trouble intubating her, 2 and by late evening, after the surgery, she was having difficulty breathing. Her respiratory distress intensified throughout the night and measures were taken by hospital staff in an attempt to resolve the problem. The respiratory difficulty continued and an emergency tracheostomy was eventually performed; this too failed in solving the respiratory crisis. 3 Helen Czapinski went into cardiac arrest and was pronounced dead at 8:29 a.m. on October 20,1995. A post mortem examination showed that her esophagus had been lacerated, apparently allowing air to escape into her neck, a potential cause of the respiratory obstruction. 4
*321 ¶ 4. At the time of her death, Helen Czapinski was not survived by a spouse. As a result, her two adult children, Susan and Gary Czapinski, filed a medical malpractice claim under Wis. Stat. ch. 655 on November 12, 1997. They alleged that St. Francis Hospital, Inc., "acting through its employees, agents and others for whom it is responsible in respondeat superior," negligently caused their mother "to sustain injuries, severe pain and suffering, and ultimately to die." (R. at 1:5.) The Czapinskis sought damages for loss of their mother's society and companionship.
¶ 5. The defendant, St. Francis Hospital, along with American Continental Insurance Company, and Wisconsin Patients Compensation Fund (hereinafter, St. Francis) filed a motion for judgment on the pleadings pursuant to Wis. Stat. § 802.06(3). St. Francis claimed that the Czapinskis failed to state a claim upon which relief could be granted because Wis. Stat. ch. 655 precludes adult children from recovering for wrongful death resulting from medical malpractice.
¶ 6. The Czapinskis responded to this motion by claiming that Wis. Stat. § 893.55(4)(f) supersedes Wis. Stat. § 655.007 in terms of who may bring a cause of action in medical malpractice death cases, and it makes the classification of claimants entitled to bring wrongful death actions under Wis. Stat. § 895.04(4) 5 applicable to claims for loss of society and companionship in medical malpractice actions. The Czapinskis argued that this classification would include adult children's claims for such loss.
¶ 7. The circuit court, the Honorable Louis J. Ceci presiding, granted St. Francis' motion and dis *322 missed the complaint with prejudice. The circuit court held that adult children lack standing to recover for loss of society and companionship in the wrongful death of a parent caused by medical malpractice, because Wis. Stat. § 893.55(4) makes applicable to medical malpractice death cases only the limit on damages and does not incorporate the wrongful death classification of claimants entitled to bring such an action. The circuit court held that the classification of claimants entitled to bring claims for loss of society and companionship in wrongful death actions for medical malpractice are limited to those enumerated in Wis. Stat. § 655.007.
¶ 8. The Czapinskis appeal on two grounds. 6 First, they claim that as of May 25, 1995, Wis. Stat. § 893.55(4)(f) incorporated adult children in the classification of claimants that may bring claims for loss of society and companionship in wrongful death actions in medical malpractice cases. In support of their claim, they point to the terminology of § 893.55(4)(f), which provides in part, "damages recoverable against health care providers and an employee of a health care provider. . .for wrongful death are subject to the limit under s. 895.04(4)." Wisconsin Stat. § 895.04(4), in turn, provides that in wrongful death actions, "[additional damages not to exceed $150,000 for loss of society and companionship may be awarded to the spouse, children or parents of the deceased." 7
¶ 9. Second, the Czapinskis argue that if Wis. Stat. § 893.55(4)(f) is construed to incorporate only the wrongful death limitation on damages, and not the *323 classification of wrongful death claimants entitled to bring such actions, then the statute should be struck down as unconstitutional for violating the equal protection provision in art. I, § 1 of the Wisconsin Constitution. 8 Under the current statute, physicians whose negligence causes death while acting in a medical capacity are treated differently than physicians whose negligence causes death while acting in a non-medical capacity. Furthermore, adult children would not have the same protections under the law as minor children. The Czapinskis claim that this inequitable treatment of both tortfeasors and tort victims violates equal protection.
¶ 10. St. Francis seeks an affirmation of the circuit court decision, which would prevent adult children from recovering for loss of society and companionship in medical malpractice cases. They argue that because Wis. Stat. § 893.55(4)(f) only incorporates the amount of damages a claimant may recover in medical malpractice suits, the classification of claimants entitled to bring such a claim under medical malpractice is limited to those enumerated in Wis. Stat. § 655.007. St. Francis argues that the Czapinskis could not meet the heavy burden to show that Wis. Stat. § 893.55(4)(f) is unconstitutional.
¶ 11. The court of appeals certified the appeal to this court for its determination. We are presented with two issues for review. First, does Wis. Stat. § 893.55(4)(f) expand the classification of claimants *324 entitled to collect damages for loss of society and companionship in medical malpractice claims to include adult children who have lost a parent as a result of medical malpractice? 9 Second, if § 893.55(4)(f) is construed not to incorporate adult children who have lost a parent in the classification of claimants that can collect damages resulting from loss of society and companionship in medical malpractice cases, does this statute then violate the equal protection provision of the Wisconsin Constitution?
í — I HH.
¶ 12. We first address whether Wis. Stat. § 893.55(4)(f) includes adult children in the class of claimants that can recover for loss of society and companionship in a medical malpractice suit. The interpretation of a statute is a question of law that is reviewed
de novo. Burks v. St. Joseph's Hosp.,
¶ 13. We conclude that Wis. Stat. § 893.55(4)(f) does not expand the classification of claimants entitled to recover for loss of society and companionship in the wrongful death of a parent caused by medical malpractice to include adult children. Statutory language along with legislative history and precedent lead us to hold *325 that the intent of the legislature was to make applicable to medical malpractice death cases only the Wis. Stat. § 895.04(4) limit on damages, 10 and not to incorporate the wrongful death classification of claimants entitled to bring such an action.
¶ 14. We begin by outlining the statutory provisions at issue in this case. Wisconsin Stat. ch. 655 provides medical patients a recourse for health care liability and establishes the Patients Compensation Fund. Chapter 655 was created in 1975 as a response to what the legislature perceived as a "social and economic crisis."
State ex rel. Strykowski v. Wilkie,
The legislature cited a sudden increase in the number of malpractice suits, in the size of awards, and in malpractice insurance premiums, and identified several impending dangers: increased health care costs, the prescription of elaborate "defensive" medical procedures, the unavailability of certain *326 hazardous services and the possibility that physicians would curtail their practices.
However, soon after the enactment of Chapter 655, the legislature passed Wis. Stat. § 893.55, in part, to limit the damages a claimant could recover under medical malpractice claims.
¶ 15. Before the enactment of Wis. Stat. § 893.55(4)(f) in 1995, Wis. Stat. § 893.55(4)(b) and (d) provided that the limit on total noneconomic damages would be $1 million for actions filed or after June 14, 1986 and before January 1, 1991. During this same time period, damages for loss of society and companionship in all other wrongful death cases were limited under Wis. Stat. § 895.04(4) to $50,000.
Rineck v. Johnson,
¶ 16. In 1990, this court held that the larger $1 million limitation under Wis. Stat. ch. 655 superseded the smaller limitation in the general wrongful death statute.
Rineck,
¶ 17. The statutory construction of Wis. Stat. § 893.55(4)(f) supports our interpretation of only incorporating the damage limitations of Wis. Stat. § 895.04(4), and not the class óf claimants entitled to bring such an action under- that same section. A court will not ordinarily engage in statutory construction unless a statute is ambiguous.
Harris v. Kelley,
¶ 18. In
Rineck,
¶ 19. This statutory, construction is also supported by specific language in Wis. Stat. § 893.55(4)(f). First, the legislature chose to use the term "limit" to expand medical malpractice cases to incorporate only the wrongful death recovery limitation for loss of soci *329 ety and companionship. The word "limit" in its singular form suggests that the legislature did not want the entire second sentence of Wis. Stat. § 895.04(4) to be incorporated into § 893.55(4)(f). Had the legislature wanted also to incorporate the class of claimants entitled to recover for loss of society and companionship in wrongful death suits to medical malpractice suits, they could have easily done so by changing Wis. Stat. § 655.007, or by expressly stating this intention in § 893.55(4)(f), when the wrongful death limit on noneconomic damage awards was also incorporated.
¶ 20. Further, the final sentence in Wis. Stat. § 893.55(4)(f) clarifies that the legislature intended to equate "limit" with monetary damages, not a class of claimants. The sentence states that "if damages in excess of the limit under s. 895.04(4) are found, the court shall make any reduction required under s. 895.045 and shall award the lesser of the reduced amount or the limit under s. 895.04(4)." § 893.55(4)(f). The repeated references to § 895.04(4) connect "limit" to damages, but there is ño reference that connects "limit" to a class of claimants.
¶ 21. Second, Wis. Stat. § 893.55(4)(f) uses the language, "damages recoverable. . .are subject to the limit under s. 895.04(4)." (Emphasis added.) This shows that the legislature intended to extend to medical malpractice suits the wrongful death limit on damages, not the class of claimants entitled to bring such a suit. Again, had the legislature been attempting to incorporate the wrongful death class of claimants to medical malpractice claims, they could have used terminology such as, "damages recoverable and class of claimants entitled to bring a s.uit. . .are subject to the limits under s. 895.04(4)." This type of statutory language would have decidedly incorporated the wrongful *330 death class of claimants that could recover damages for loss of society and companionship into medical malpractice cases. But, the legislature did not use such terminology.
¶ 22. "When interpreting a statute, our primary objective is to ascertain and give effect to the intent of the legislature.. .and the legislature is presumed to act with knowledge of the existing case law."
Ziulkowski,
¶ 23. Numerous Wisconsin courts, including this one, have held that adult children lack standing to recover for loss of society and companionship in medical malpractice cases.
Ziulkowski,
¶ 24. Our construction of Wis. Stat. § 893.55(4) is also supported by legislative history, which is properly subject to judicial notice.
Strykowski,
¶ 25. Petitioners argue that the real purpose in enacting Wis. Stat. § 893.55(4)(f) was to make the treatment of medical malpractice claims and other tort actions uniform. They support this proposition by citing several prepared statements from members of the medical and insurance communities who testified in favor of amending Wis. Stat. ch. 655 to create a system that would treat medical malpractice death cases the same as actions under the wrongful death act. The Petitioners, however, fail to discuss the context in which such testimony was presented. When examining a particular phrase in a statute, a court must look at the phrase in light of the entire statute.
Elliott v. Employers Mut. Cas. Co.,
HH HH I — Í
¶ 26. The second issue raised by Petitioners is based on the Equal Protection Clause of the Wisconsin Constitution. They argue that if this court would find Wis. Stat. § 893.55(4)(f) not to include adult children in the classification of claimants that could recover for loss of society and companionship in medical malpractice death cases, then the statute would be in violation of art. I, § 1 of the Wisconsin Constitution — the equal protection provision. We conclude that this claim has no merit. Although § 893.55(4)(f) creates separate classifications for both tortfeasors and tort victims, these classifications do not violate equal protection.
¶ 27. This court starts with the presumption that a statute is constitutional and will continue to preserve a statute's constitutionality if there is a reasonable basis for the exercise of legislative power.
Miller v. Kretz,
¶ 28. We have previously held that Wis. Stat. ch. 655 does not deny any fundamental right.
Strykowski,
¶ 29. In applying the rational basis standard to equal protection challenges, this court is not concerned with the wisdom or correctness of the legislative determination.
Strykowski,
(1) All classifications must be based upon substantial distinctions which make one class really different from another.
(2) The classification adopted must be germane to the purpose of the law.
(3) The classification must not be based upon existing circumstances only and must not be so constituted as to preclude addition to the numbers included within a class.
(4) To whatever class a law may apply, it must apply equally to each member thereof.
(5) The characteristics of each class should be so far different from those of other classes as to reasonably suggest at least the propriety, having regard to the public good, of substantially different legislation.
Id. at 509 n.8.
¶ 30. Petitioners' equal protection argument has two parts. First, medical personnel, as tortfeasors, would be immune from claims brought by adult children of parents who died as a result of medical malpractice. Medical personnel would have immunity from damage awards for loss of society and companionship while other non-medical personnel would not. Second, under the Respondents' interpretation of § 893.55(4)(f), adult children of parents who died as a result of medical malpractice would not be given the same opportunity to recover damages for loss of society and companionship as would minor children in the same circumstance. However, this court has already held that medical malpractice actions are substantially
*336
distinct from other tort actions when it upheld the constitutionality of Wis. Stat. ch. 655.
Strykowski,
¶ 31. Because medical malpractice actions are substantially distinct from other tort actions, it is reasonable to conclude that the legislature has the constitutional authority to determine which classifications of persons are eligible to pursue a medical malpractice claim. Possible justifications for the statutory limit on the ability of adult children to recover for loss of society and companionship when a parent dies as a result of medical malpractice include the prevention of,
inter alia,
a sudden increase in the number of malpractice suits, increased medical costs or decreased accessibility to health care.
Strykowski,
¶32. For the foregoing reasons, the classifications of tortfeasors and tort victims are not arbitrary or irrational, but are based on reasonable and rational criteria. Therefore, the Petitioners' equal protection argument must fail.
IV.
¶ 33. We hold that an adult child lacks standing to recover for loss of society and companionship in a wrongful death case involving medical malpractice. The language of Wis. Stat. § 893.55(4)(f), along with legislative history, shows that the classification of claimants entitled to bring a wrongful death suit for medical malpractice was not expanded to include adult children, and is limited to the classification of claimants enumerated in Wis. Stat. § 655.007. Further, we hold that Wis. Stat. § 893.55(4)(f) does not violate the Equal Protection Clause of the Wisconsin Constitution. Accordingly, the circuit court decision is affirmed.
*338 By the Court. — The judgment of the circuit court is affirmed.
Notes
All subsequent references to the Wisconsin Statutes are to the 1995-96 text unless otherwise noted. 1995 Wisconsin Act 10 created Wis. Stat. § 893.55(4)(f), which became effective on May 25, 1995. Section 893.55(4)(f) sets forth the damages for loss of society and companionship recoverable for a wrongful death resulting from medical malpractice.
An endotracheal tube was inserted during Helen Czapin-ski's surgery. The Petitioners contend that this tube punctured her trachea and esophagus.
A tracheostomy is the construction of an artificial opening through the neck into the trachea, usually done to help difficulty in breathing.
It is not clear in the record when the laceration of the esophagus occurred; the Petitioners alleged that the laceration occurred during the intubation done during surgery.
Wisconsin Stat. § 895.04(4) sets forth the damages available for loss of society and companionship in a wrongful death action.
An amicns cnriae brief was filed on behalf of the Czapin-skis by the Wisconsin Academy of Trial Lawyers.
The parties in this action dispute whether "children" in Wis. Stat. § 895.04(4) refers to both adult and minor children.
Petitioners claim that following our interpretation of Wis. Stat. § 893.55(4)(f), the statute would also violate the due process provision of the Wisconsin Constitution. However, Petitioners failed to present any further arguments pertaining to due process in either their brief or at oral argument, and thus, we do not address the due process issue.
Wisconsin Stat. § 893.55(4)(f) provides in pertinent part, "Notwithstanding the limits on noneconomic damages under this subsection, damages recoverable against health care providers. . .acting within the scope of his or her employment and providing health care services, for wrongful death are subject to the limit under s. 895.04(4)."
Wisconsin Stat. §895.04(4) now reads "Judgment for damages for pecuniary injury from wrongful death may be awarded to any person entitled to bring a wrongful death action. Additional damages not to exceed * * * $500,000 per occurrence in the case of a deceased minor, or $350,000 per occurrence in the case of a deceased adult, for loss of society and companionship may be awarded to the spouse, children or parents of the deceased, or to the siblings of the deceased, if the siblings were minors at the time of the death." Wis. Stat. Ann. § 895.04(4) (West Supp. 1999).
Wisconsin Stat. § 893.55 Medical malpractice; limitation of actions; limitation of damages; itemization of damages. (4)(f) Notwithstanding the limits on noneconomic damages under this subsection, damages recoverable against health care providers and an employe of a health care provider, acting within the scope of his or her employment and providing health care ser *327 vices, for wrongful death are subject to the limit under s. 895.04 (4). If damages in excess of the limit under s. 895.04(4) are found, the court shall make any reduction required under s. 895.045 and shall award the lesser of the reduced amount or the limit under s. 895.04(4).
Wisconsin Stat. § 895.04(4) pertains to limits on wrongful death awards and states, in part, "Additional damages not to exceed $150,000 for loss of society and companionship may be awarded to the spouse, children or parents of the deceased."
Wisconsin Stat. § 895.04(2) includes adult children in the class of claimants that can recover for wrongful death.
Senate Substitute Amendment 1 to 1997 Senate Bill 148, which was rejected, proposed that Wis. Stat. § 655.007 be amended to state, in part, that "any patient or the patient's representative having a claim or any spouse, parent, sibling or child of the patient having a derivative claim for injury or death on account of malpractice is subject to this chapter. In this section, "child" means an adult or minor child." The amendment of § 655.007 that passed both houses and was signed into law stated, in pertinent part, that "any patient or the patient's representative having a claim or any spouse, parent, minor sibling or child of the patient having a derivative claim for injury or death on account of malpractice is subject to this chapter." Wis. Stat. § 655.007 (1997 — 1998). This is at least some evidence that the legislature specifically declined to include adult children in *332 the class of claimants that could recover for medical malpractice.
Examples of suspect criterion include race, alienage, or nationality.
Miller v. Kretz,
As stated earlier, this court is not concerned with the wisdom or correctness of a legislative determination.
State ex rel. Strykowski v. Wilkie,
