Charles E. Havenstrite (Claimant) petitions for review of an order of the Workers’ Compensation Appeal Board (Board) that affirmed the decision of a workers’ compensation judge (WCJ)(1) denying Claimant’s petition to review medical treatment and/or billing and to review compensation benefits, and (2) concluding that chiropractic treatment rendered to Claimant by Joseph Intelisano, D.C., (Provider) after August 1, 2000, was neither reasonable nor necessary. We affirm the order of the Board.
Claimant was injured on June 25, 1999, during the course of his employment with the Commonwealth of Pennsylvania, Department of Conservation and Natural Resources (Employer), when he slipped and fell on his left side while cutting brush with a weed whacker. Employer issued a Notice of Compensation Payable describing Claimant’s injury as strain to the left bicep muscle. Provider began to treat Claimant in January, 1999.
On August 29, 2000, Employer filed a petition for utilization review request questioning whether Provider’s treatment of Claimant on and after August 1, 2000 was reasonable or necessary. On September 5, 2000, the Bureau of Workers’ Compensation appointed Hoover Rehabilitation Services, Inc. as the utilization review organization, and Hoover, in turn named Thomas Kollars, D.O., a chiropractor, as its reviewer. Dr. Kollars issued his report on October 7, 2000, indicating his opinion that Provider’s treatment was neither reasonable nor necessary to address Claimant’s work-related injury. Hoover issued a utilization review determination face sheet, dated October 20, 2000, based upon Dr. Kollars’ report, indicating that Provider’s treatment was neither reasonable nor necessary.
On October 30, 2000, Claimant and Provider jointly filed a Petition for Review of Utilization Review Determination.1 Additionally, Claimant filed a second petition on January 19, 2001, seeking to (1) review medical treatment and/or billing, and (2) review compensation benefits,2 for the purpose of amending the description of Claimant’s work-related injury as indicated on the NCP.
Claimant and Provider raise two issues for our review: (1) Whether the Board erred in affirming the WCJ’s conclusion that Claimant failed to meet his burden of proof to establish that the NCP should be amended because it contained a material *1176mistake; and (2) Whether the testimony of the appointed utilization reviewer, Dr. Kol-lars, constitutes substantial evidence to support the WCJ’s findings in support of his conclusion that Provider’s treatment was not reasonable nor necessary.3
With regard to Claimant’s review petition, wherein he challenged the NCP description of his injury, Employer presented the April 30, 2000 report of Charles J. Hubbard, M.D., an orthopedic surgeon. Dr. Hubbard reviewed an earlier report he issued after he performed an independent medical examination of Claimant on January 19, 2000, and reviewed “documentation that was supplied [to him] at that time.” Dr. Hubbard also considered additional “materials” that Employer’s attorney provided to Dr. Hubbard. Among these materials and documents were reports from Dr. Conaboy, one of Claimant’s earlier treating physicians, and Provider. Based upon his review of this information and Claimant’s medical history, Dr. Hubbard opined that Claimant’s injury was limited to a strain of his left bicep muscle and tendon. The only medical evidence Claimant presented was Provider’s testimony. Provider opined that Claimant had sublux-ions of bilateral shoulders; subluxions of cervical spine; bilateral radiculopathy; cervical myovitis; and degenerative joint disease, G-A through C-6.
The WCJ rejected Provider’s diagnosis, and found Dr. Hubbard’s testimony credible. The WCJ is the arbiter of credibility in workers’ compensation matters. Environmental Options Group v. Workers’ Compensation Appeal Board (Brown), 787 A.2d 460 (Pa.Cmwlth.2001), petition for allowance of appeal denied, 569 Pa. 696, 803 A.2d 736 (2002). Claimant’s challenge is essentially an attack on the WCJ’s credibility determinations. Because those determinations are unassailable and support the necessary factual findings, we reject Claimant’s challenge to the WCJ’s denial of Claimant’s review petition.
We now address the remaining issue. Claimant asserts that the Board erred in affirming the WCJ’s decision because Dr. Kollars, the appointed reviewer, did not initiate discussions with Provider. Claimant asserts that, because Dr. Kollars indicated that one of the reasons he concluded Provider’s treatments were not reasonable or necessary was that Provider’s documentation was insufficient (for example, he could not understand some of Provider’s notes concerning his treatment of Claimant), Dr. Kollars had a duty to inquire as to the meaning of Provider’s notes. Specifically, Claimant relies upon 34 Pa.Code § 127.469, which provides:
Duties of reviewers — consultation with provider under review.
The [Utilization Review Organization (URO)] shall give the provider under review written notice of the opportunity to discuss treatment with the reviewer. The reviewer shall initiate discussion with the provider under review when such a discussion will assist the reviewer in reaching a determination. If the provider under review declines to discuss treatment decisions with the reviewer, a determination shall be made in the absence of such a discussion.
(Emphasis added.)
Additionally, 34 Pa.Code § 127.471 provides “[i]f the reviewer is unable to determine whether the treatment under review is reasonable or necessary, the reviewer *1177shall resolve the issue in favor of the provider under review.”
Thus, based upon Dr. Kollar’s statement in his report that Provider’s “office notes are weak and sketchy” and that his “objective findings are handwritten and difficult to interpret,” Claimant contends that the above-quoted regulations placed a duty upon Dr. Kollars to initiate communications with Provider in order to clarify the information in Provider’s office notes that he did not understand. Claimant asserts that taking such action would have assisted Dr. Kollars in reaching a determination as to the reasonableness and necessity of Provider’s treatment.
Three decisions of this court control our conclusion here. In Seamon v. Workers’ Compensation Appeal Board (Sarno & Son Formals), 761 A.2d 1258 (Pa.Cmwlth. 2000), petition for allowance of appeal granted, 566 Pa. 654, 781 A.2d 150, appeal dismissed as improvidently granted, 572 Pa. 410, 816 A.2d 1096 (2003), this court, relying upon Section S06(f.l) of the Workers’ Compensation Act, Act of June 2, 1915, P.L. 736, as amended, 77 P.S. § 531(6)(iv), noted that a WCJ must consider a utilization review report as evidence, but is not bound by the report in reaching his decision. Rather, the WCJ determines the degree of credibility and weight to which the report is entitled. The Court stated that “[a]ny deficiency or irregularity in the [utilization review] process can be argued before and considered by the WCJ in determining the weight and credibility of the [utilization review] evidence.” Id. at 1262.
In Solomon v. Workers’ Compensation Appeal Board (City of Philadelphia), 821 A.2d 215 (Pa.Cmwlth.2003), the Court summarized our holding in Bolinsky v. Workers’ Compensation Appeal Board (Norristown State Hospital), 814 A.2d 833 (Pa.Cmwlth.2003), that a utilization reviewer’s failure to obtain a claimant’s “entire medical file does not automatically preclude a [utilization review] reviewer from assessing the reasonableness or necessity of a particular treatment. This is true even where there was no substantive contact between the reviewer and the treating health care provider.” Solomon, 821 A.2d at 219, (citing Bolinsky, 814 A.2d at 836-37).
The Court in Solomon concluded,
The WCJ must make credibility and weight of the evidence determinations regarding any irregularity or deficiency of the contested evidence. Here, as in Seamon and Bolinsky, the breadth of information reviewed is a factor which the fact-finder may consider, but is no more conclusive than any other single factor considered in evaluating the credibility of conflicting expert opinions. We decline the invitation to declare a [utilization review] reviewer’s opinion automatically incompetent for failure to review the entire medical file or speak with the health care provider.
Id. at 220.
The facts in Bolinsky are likewise instructive. In that case, the employer relied upon a reviewer’s report that indicated that physical therapy was not reasonable or necessary for the claimant. The UR determination affirmed that conclusion, and the claimant sought review of that decision before a WCJ. The claimant submitted her medical records and a neurologist’s report. The neurologist opined that the physical therapy was reasonable and necessary, and the claimant testified that the therapy helped to decrease her pain and improve her mobility. The WCJ, accepting the testimony of the claimant and her neurologist, concluded that the treatments were reasonable and necessary. As in Bolinsky, Claimant here had a full and fair opportunity to present his evidence to *1178the WCJ, and the WCJ rejected Provider’s testimony as to the reasonableness and necessity of his treatment. Unlike Bolin-sky, the WCJ in this case accepted as credible the testimony of employer’s witnesses, Dr. Hubbard and Dr. Kollars.
We conclude that, in accordance with the above-cited authority, the WCJ performed his role properly by assigning credibility and weight-of-the-evidence where he deemed it belonged — with Employer’s witnesses. Although Seamon and Solomon are factually distinguishable from the present case, in that the reviewers in those cases indicated that the lack of information would not prevent them from forming an opinion as to the reasonableness or necessity of the care at issue, that distinction is immaterial under Solomon. Nor is our decision affected by the fact that Solomon and Seamon involved the lack of information from providers whose treatment was not being questioned. The point to be taken from Seamon and Solomon is that any defects in the utilization review process, if challenged by a claimant, provider, or employer, can be addressed by a WCJ in a hearing on the merits. An allegedly aggrieved claimant or provider has the opportunity in a hearing before a WCJ to challenge the credibility of a reviewer’s report, and can there assert that the WCJ should not assign much weight to the report because it is based on incomplete information or a failure to follow the utilization review procedures.
In this case, the WCJ considered not only the report of Dr. Kollars, but also the report of Dr. Hubbard, who indicated that Claimant’s injury was limited to his left bicep muscle and tendon, and that his condition did not require treatment after August 1, 2000. Based upon this substantial evidence, we agree with the Board’s conclusion that the WCJ did not err in determining that Provider’s treatments were neither reasonable nor necessary for Claimant’s work-related injury.
ORDER
AND NOW, this 15th day of October 2003, the order of the Workers’ Compensation Appeal Board is affirmed.
. Colloquy between counsel for the parties and the WCJ on January 18, 2001, the date of the first hearing in this matter, indicates that Provider also filed a petition for review of utilization review on his own behalf. The WCJ indicated that the two petitions would be consolidated. We note that the original record contains only the one petition dated October 20, 2000, which, on its face indicates both Claimant and Provider as petitioners.
. Claimant filed this second petition following the first hearing apparently because Provider’s testimony at the January 18, 2001 hearing indicated that he was treating Claimant for injuries beyond the left bicep muscle injury indicated on the NCP. Claimant sought to show that the NCP injury description was wrong, and that Provider was treating him solely for his actual work-related injuries he alleged were not fully described in the NCP.
. Our scope of review is limited to determining whether substantial evidence supports necessary factual findings, whether the Board committed legal error, and whether constitutional rights were violated. 2 Pa.C.S.A. § 704.