Item 4.01. Changes in Registrant's Certifying Accountant.
OnApril 1, 2020 ,Grant Thornton , the independent registered public accounting firm of the Company for the fiscal year endedDecember 31, 2019 , notified the Company of its decision not to stand for re-appointment as the Company's independent registered public accounting firm for the fiscal year endingDecember 31, 2020 .Grant Thornton was previously engaged to review the Company's condensed consolidated financial statements for the quarter endedMarch 31, 2020 . Accordingly,Grant Thornton continued to serve as the Company's independent registered public accounting firm through the completion of such review and the Company's filing of its Quarterly Report on Form 10-Q for the quarter endedMarch 31, 2020 (the "Form 10-Q"). The Company filed the Form 10-Q with theSEC onMay 11, 2020 , at which timeGrant Thornton's resignation as the Company's independent registered public accounting firm became effective. The Audit Committee of the Company's Board of Directors (the "Audit Committee") is engaged in a process to select a successor independent registered public accounting firm for the year endingDecember 31, 2020 . The reports ofGrant Thornton on the Company's consolidated financial statements for the fiscal years endedDecember 31, 2019 ("fiscal 2019") andDecember 31, 2018 ("fiscal 2018") did not contain an adverse opinion or a disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope or accounting principles. During fiscal 2019 and fiscal 2018, and the subsequent period throughMay 11, 2020 , there were (i) no "disagreements" (as that term is defined in Item 304 (a)(1)(iv) of Regulation S-K and the related instructions) withGrant Thornton on any matter of accounting principles or practices, financial statement disclosure or auditing scope or procedure, which disagreements, if not resolved to the satisfaction ofGrant Thornton , would have causedGrant Thornton to make reference to the subject matter of the disagreements in connection with its report, and (ii) no "reportable events" (as that term is defined in Item 304(a)(1)(v) of Regulation S-K), except as described below. As disclosed in the Company's Annual Report on Form 10-K for fiscal 2019, management identified material weaknesses in the operating effectiveness of the Company's internal control over financial reporting that existed as ofDecember 31, 2018 , including material weaknesses relating to the ineffectiveness or failure to maintain effective controls relating to: (1) the control environment, (2) accounting for net patient service operating revenues, net accounts receivable, amounts due to payors, income taxes, noncontrolling interests and review and approval of journal entries, (3) information and communication and (4) monitoring. In connection with the Company's ongoing remediation efforts of the material weaknesses that existed as ofDecember 31, 2018 , management identified an additional material weakness in the Company's internal control over financial reporting that existed as ofDecember 31, 2019 . Specifically, the Company's controls over the financial statement close process were not effectively designed to ensure that the Company's financial statements are in compliance withU.S. generally accepted accounting principles due to a lack of sufficient accounting and supervisory personnel. The Audit Committee has discussed the subject matter of the foregoing material weaknesses withGrant Thornton , and the Company has authorizedGrant Thornton to respond fully to any inquiries concerning such matters made by the successor auditor expected to be engaged as the Company's independent registered public accounting firm to perform audit services for the fiscal year endingDecember 31, 2020 . The Company has provided a copy of the foregoing disclosures toGrant Thornton and requested thatGrant Thornton furnish the Company with a letter addressed to theSEC stating whetherGrant Thornton agrees with the above statements and, if not, stating the respects in which it does not agree. A copy ofGrant Thornton's letter, datedMay 15, 2020 , is filed as Exhibit 16.1. 2
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Item 9.01. Financial Statements and Exhibits
(d) Exhibits. Exhibit Number Description 16.1 Letter ofGrant Thornton LLP , datedMay 15, 2020 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 3
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