delivered the Opinion of the Court.
¶1 Rubеn Fellenberg (Fellenberg) appeals the Workers’ Compensation Court’s denial of his claim for benefits under the Occupational Disease Act of 1985. We affirm.
ISSUES
¶2 Fellenberg presents the following issues on appeal:
¶3 1. Did the Workers’ Compensation Court (WCC) err in concluding that he is not entitled to permanent total disability (PTD) benefits?
¶4 2. Did the WCC err in concluding that he is not entitled to 500 weeks of permanent partial disability (PPD) benefits under
Hunter v. Gibson Products of Billings
(1986),
¶5 3. Did the WCC err in concluding that he is not entitled to an impairment award?
¶6 4. Are various statutes in the Montana Occupational Disease Act (MODA) unconstitutional?
FACTUAL AND PROCEDURAL BACKGROUND
¶7 Fellenberg worked for W.R. Grace/Zonolite (Grace) in Libby, Montana, from 1958 until July 1986. In March 1985, Fellenberg was diagnosed with asbestosis. He immediately filed a report of occupational diseаse alleging that his asbestosis arose out of his employment. Transportation Insurance Company (Transportation), Grace’s insurer at that time, denied the claim.
¶8 In July 1986, at the age of 62, Fellenberg retired. He elected early sоcial security retirement benefits, which he has been receiving since 1986. He also has been receiving a pension from Grace since 1986.
*469 ¶9 Since his retirement, Fellenberg’s lung disease has become progressively worse, and in October 1998, his personal physician deemed him permanently totally disabled. On December 5, 2002, Fellenberg filed a Petition for Trial seeking compensation and medical benefits under the 1985 1 Montana Occupational Disease Act. In February 2003, Transportation accepted liability for Fellenberg’s illness but challenged the claim on several grounds.
¶10 Following a trial, the WCC issued Findings of Fact, Conclusions of Law and Judgment. The WCC found that, while still capable of working, Fellenberg voluntarily retired from Grace in 1986, for reasons unrelated to his occupational asbestos disease. The court further found that Fellenberg has not worked since his retirement and that at the time of his retirement, he had no intention of returning to the work force. Fellenberg does not dispute these findings.
¶11 The WCC concluded that, as a result of his voluntary withdrawal from the labor force in 1986, Fellenberg was not entitled to PTD benefits because he did not meet the statutory requisites for such benefits. Specifically, the court concluded Fellenberg had no “loss of actual earnings” or loss of “earning capability” as a result of his occupational disease; rather, his “loss of actual earnings” was the result оf his voluntary retirement. Furthermore, while finding that Fellenberg suffered a sixty percent loss of earning capability, the WCC concluded that such a reduction in earning capability was not compensable because he had voluntarily retired at 62, and at age 79, did not work and did not intend to work. The WCC also concluded that under the 1983 version of § 39-71-710, MCA, Fellenberg would not be entitled to PTD benefits at any fixture time because he receives social secxxrity retirement benefits.
¶12 Having dеtermined that Fellenberg was not entitled to PTD benefits, the WCC concluded that Fellenberg likewise did not qualify for PPD benefits, pursuant to Hunter. The Court also concluded that Fellenberg was not entitled to an impairment award. Lastly, the WCC considered Fellenberg’s constitutional challenges to two of the four statutes in question and held that the statutes were constitutional. Fellenberg appeals these WCC determinations.
*470 STANDARD OF REVIEW
¶13 Our review of a WCC decision is twofold. We review the court’s findings of fаct to determine whether they are supported by substantial credible evidence and its conclusions of law to determine whether they are correct.
Van Vleet v. Ass’n of Counties Work. Comp.,
DISCUSSION
¶14 Fellenburg maintains that the WCC erred in taking into account his voluntary retiremеnt when considering his eligibility for PTD benefits. Transportation counters that the cause of one’s loss of earnings and earning capability is critical to one’s eligibility for PTD benefits, and that, since Fellenburg retired voluntarily and for reasons wholly unrеlated to his asbestosis condition, he fails to qualify for PTD benefits under the PTD statute.
¶15 “Permanent total disability,” as defined by the 1983 Workers’ Compensation Act, 2 means:
a condition resulting from injury as defined in this chapter that results in the loss of actual earnings or earning capability that exists after the injured wоrker is as far restored as the permanent character of the injuries will permit and which results in the worker having no reasonable prospect of finding regular employment of any kind in the normal labor market. Disability shall be supported by a preponderance of medical evidence. (Emphasis added.)
Section 37-71-116(13), MCA (1983).
¶16 As argued by Transportation, in addition to meeting the specific medical and labor market components of § 37-71-116(13), MCA, to qualify for benefits, a claimаnt must also establish a causal connection between his or her injury and the right to benefits. “Causation is an essential element to an entitlement to benefits and the claimant has the burden of proving a causal connection by a preponderance of the evidence.”
Grenz v. Fire and Cas. of Connecticut
(1991),
¶17 To be entitled to benefits under § 37-71-116(13), MCA, *471 Fellenberg must prove that he has a “condition resulting from an injur/’ as defined in the applicable statutes, and that it is the injurious condition that “results in the loss of actual earnings” or a lоss of “earnings capability.” While acknowledging that Fellenberg had an injurious condition that was one hundred percent attributable to his former employment with Grace, the WCC concluded that Fellenberg failed to establish that his 1998 disability condition caused a “loss of actual earnings.” It is important to note that this conclusion stems from certain undisputed facts. Fellenburg admitted in testimony that his 1986 retirement was not related to his lung disease. Moreover, he said that he did not work nor did he intend to return to work after 1986. In other words, Fellenberg ceased receiving “actual earnings” at the time he retired, and that “loss of actual earnings” had nothing to do with his medical condition. The court also concluded that, whilе Fellenberg had a sixty percent diminution in earnings capability, his voluntary retirement and lack of intent to return to work precluded recovery based on diminished wage capability.
¶18 Fellenberg cites numerous cases to support his argument that he need not be seeking employment to qualify for PTD benefits. We conclude the cases relied upon by Fellenberg are factually as well as legally distinguishable because they do not address the statutory causаtion nexus that is dispositive of this case.
¶19 In the case before us, the WCC’s ruling was based on the lack of causal connection between Fellenberg’s claimed loss of wages and earning capability, and his illness. In
Brurud v. Judge Moving & Storage Co., Inc.
(1977),
¶20 For the same reasons as those noted above,
Walker v. H.F. Johnson, Inc.
(1978),
¶21 The WCC made a factual finding that Fellenburg was not entitled to benefits for loss of earning capability. Even if we accept as true Fellenburg’s contention that he is one hundred percent disabled because he has no еarning capability in his labor market, the fact remains that his decision not to work again has been both longstanding and resolute-he decided years ago, for reasons unrelated to his disability, never to work again. Nor has he testified that he would return to work now, but for his disability. Therefore, the causal connection between the loss of earning capability and his disabling condition resulting from injury that the PTD statute requires, is missing.
¶22 In
Hash v. Montana Silversmith
(1993),
¶23 Because we find the lack of causation issue dispositive, we need not reach the remaining theories addressed by the parties under which Fellenburg might otherwise be entitled to or denied PTD benefits.
¶24 We likewise affirm the WCC’s determination with respect to Fellenburg’s claim for PPD benefits. As Fellenburg himself argues on appeal, he would be entitled to 500 weeks of PPD benefits under
Hunter v. Gibson Products of Billings
(1986),
*473
¶25 Fellenberg also challenges the WCC’s conclusion that he is not entitled to an impairment award. Fellenberg argues that as a result of his PTD, he is entitled to a disability award in accordance with
Holton v. F.H. Stoltze Land & Lumber Co.
3
(1981),
¶26 Finаlly, Fellenberg raises constitutional challenges with respect to four ODA statutes. Basically, he raises equal protection objections to the extent that the statutes in question deny certain benefits to occupationаlly diseased workers which are otherwise available to injured workers. Notably, though, Fellenberg does not challenge the constitutionality of § 37-71-116(13), MCA, taken from the Worker’s Compensation Act, and under which we make our decision. Sincе our decision does not require us to interpret or apply any ODA statute the constitutionality of which is in question, we need not reach Fellenberg’s constitutional challenges to those statutes.
*474 CONCLUSION
¶27 For the foregoing reasons, we affirm the Workers’ Compensation Court.
Notes
The WCC decided the matter under the 1983 MODA. Use of the 1983 Act was acceptable to the parties as there was no substantive difference between the 1983 and 1985 Acts.
The MODA does not define “permanent total disability,” therefore, the WCC correctly relied on the definition contained in the Workers’ Compensation Act.
The statutory definition of PPD as relied upon in
Holton
and
Grimshaw v. L. Peter Larson Co.
(1984),
