Additional Credit Extension Amendment

Exhibit 10.1

EXECUTION VERSION

Additional Credit Extension Amendment

This Additional Credit Extension Amendment is dated as of October 23, 2014 (this “Amendment”) by and among Manufacturers and Traders Trust Co. (the “Additional Lender”), Select Medical Corporation, a Delaware corporation (the “Borrower”), Select Medical Holdings Corporation, a Delaware corporation (“Holdings’) and JPMorgan Chase Bank, N.A., as Administrative Agent and Collateral Agent.

W I T N E S S E T H:

WHEREAS, reference is hereby made to that certain Credit Agreement, dated as of June 1, 2011 and as amended by Amendment No. 1 dated as of August 8, 2012, the Additional Credit Extension Amendment dated as of August 13, 2012, Amendment No. 2 dated as of November 6, 2012, Amendment No. 3 dated as of February 15, 2013, the Additional Credit Extension Amendment dated as of February 20, 2013, Amendment No. 4 dated as of June 3, 2013, and Amendment No. 5, dated as of March 4, 2014, as amended, supplemented and in effect from time to time (the “Credit Agreement”; capitalized terms used herein and not defined shall have the meanings set forth in the Credit Agreement), among SELECT MEDICAL HOLDINGS CORPORATION (“Holdings”), SELECT MEDICAL CORPORATION (the “Borrower”), JPMORGAN CHASE BANK, N.A., as Administrative Agent and Collateral Agent (the “Administrative Agent” and the “Collateral Agent,” respectively), MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED and GOLDMAN SACHS BANK USA, as Co-Syndication Agents, MORGAN STANLEY SENIOR FUNDING, INC. and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Documentation Agents, and the several banks and other financial institutions from time to time party thereto as lenders (the “Lenders”).

WHEREAS, Section 2.21 of the Credit Agreement permits the Credit Agreement to be amended from time to time in order to provide for Extended Revolving Commitments;

WHEREAS, the Additional Lender has agreed, on the terms and conditions set forth herein, to provide $6,750,000 in aggregate principal amount of Extended Revolving Commitments in the form of 2018 Extended Revolving Commitments, as contemplated by Section 2.21 of the Credit Agreement ;

WHEREAS, in accordance with Section 2.21, the Additional Lender’s existing Revolving Commitments will be reduced in an amount that corresponds with the 2018 Extended Revolving Commitments being provided hereunder by the Additional Lender;

NOW, THEREFORE, in consideration of the foregoing, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

SECTION ONE. Amendments. The Credit Agreement is, effective as of the Amendment Effective Date (as defined below) hereby amended to reflect (x) that the Additional Lender is providing $6,750,000 in aggregate principal amount of 2018 Extended Revolving Commitments and (y) that the $6,750,000 in aggregate principal amount of the Additional Lender’s existing Revolving Commitments are hereby reduced to zero. In addition, after giving effect to this Amendment on the Amendment Effective Date, the aggregate amount of the Lenders’ 2018 Extended Revolving Commitments shall be as set forth on Schedule II to this Amendment.

SECTION TWO. Conditions to Effectiveness. This Amendment shall become effective on October 23, 2014 (the “Amendment Effective Date”) when, and only when, the following conditions have been satisfied:

(i)                                     this Amendment shall have been executed and delivered by the Borrower, Holdings, the other Loan Parties, the Additional Lender and the Administrative Agent;

(ii)                                  the Administrative Agent shall have received copies of the resolutions of the board of directors (or authorized committee thereof) of (x) Holdings, (y) the Borrower and (z) each Subsidiary Loan Party approving and authorizing the execution, delivery and performance of this Amendment, certified as of the Amendment Effective Date by the corporate secretary or an assistant secretary thereof as being in full force and effect without modification or amendment;

(iii)                               the Administrative Agent shall have received a legal opinion dated the Amendment Effective Date from Dechert LLP in form and substance reasonably satisfactory to the Arrangers and the Administrative Agent;

(iv)                              the representations and warranties set forth in Article III of the Credit Agreement and in each other Loan Document shall be true and correct in all material respects (except to the extent any such representation or warranty is qualified by “materially,” “Material Adverse Effect” or a similar term, in which case such representation and warranty shall be true and correct in all respects) on and as of the date hereof (both before and after giving effect to the effectiveness of this Amendment) with the same effect as though made on and as of the date hereof, except to the extent such representations and warranties expressly relate to an earlier date, in which case they shall be true and correct in all material respects as of such earlier date (provided that the solvency representation will be deemed to have been made on the Amendment Effective Date after giving effect to the effectiveness of this Amendment);

(v)                                 to the extent not previously delivered, the Additional Lender and the Administrative Agent shall have received at least 3 business days prior to the date hereof all documentation and other information about the Borrower and the Subsidiary Loan Parties required under applicable “know your customer” and anti-money laundering rules and regulations, including the PATRIOT Act that has been requested in writing at least 5 business days prior to the date hereof;

(vii)                           immediately prior to and after giving effect to the effectiveness of this Amendment, no Default has occurred or is continuing or shall result from the effectiveness of this Amendment; and

(viii)                        to the extent not previously delivered, (i) the Administrative Agent shall have received a completed “Life-of-Loan” Federal Emergency Management Agency Standard Flood Hazard Determination with respect to each Mortgaged Property (together with a notice about special flood hazard area status and flood disaster assistance, if applicable, duly executed by the Borrower and each Loan Party relating thereto) and (ii) the Administrative Agent shall have received a copy of, or a certificate as to coverage under, the insurance policies required by Section 5.07 of the Credit Agreement including, without limitation, flood insurance policies (to the extent required in order to comply with applicable law) and the applicable provisions of the Security Documents, each of which shall be endorsed or otherwise amended to include a “standard” or “New York” lender’s loss payable or mortgagee endorsement (as applicable) and shall name the Collateral Agent, on behalf of the Secured Parties, as additional insured, in form and substance reasonably satisfactory to the Administrative Agent.

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SECTION THREE. Post-Closing Covenant. Subject to the provisions of the Collateral and Guarantee Requirement and any applicable limitations in any Loan Document, Borrower hereby agrees with the Administrative Agent to deliver, on or before the date that is 60 days after the Amendment Effective Date (or such longer period of time as may be agreed by the Administrative Agent in its sole discretion), with respect to each Mortgaged Property:

(a)                                 an amendment to each existing Mortgage (each, a “Mortgage Amendment”) duly executed and acknowledged by the applicable Loan Party and in form for recording in the recording office where such Mortgage was recorded, together with such certificates, affidavits, questionnaires or returns as shall be required in connection with the recording or filing thereof under applicable law, in each case in form and substance reasonably satisfactory to the Administrative Agent and otherwise approved by the applicable local counsel for filing in the appropriate jurisdiction;

(b)                                 with respect to each Mortgage Amendment (other than those Mortgage Amendments relating to Mortgaged Property located in New Jersey and Ohio), a datedown endorsement to each existing mortgage title policy (if such endorsement is not available in the jurisdiction, a title search and modification endorsement in lieu thereof) (each, a “Datedown Endorsement,” collectively, the “Datedown Endorsements”) relating to the Mortgaged Property subject to such Mortgage insuring the Administrative Agent that such Mortgage, as amended by such Mortgage Amendment is a valid and enforceable first priority lien on such Mortgaged Property in favor of the Collateral Agent for the benefit of the Secured Parties and that there are no Liens of record in violation of the provisions of the Loan Documents, and such Datedown Endorsement shall otherwise be in form and substance reasonably satisfactory to the Administrative Agent; and

(c)                                  with respect to each Mortgage Amendment relating to Mortgaged Property located in New Jersey and Ohio, (i) title searches in form and substance reasonably acceptable to the Administrative Agent, conducted by a title insurance company reasonably acceptable to the Administrative Agent, which reflect that there are no Liens of record in violation of the provisions of the Loan Documents and (ii) opinions addressed to the Administrative Agent and the Collateral Agent for its benefit and for the benefit of the Secured Parties of (A) local counsel in each jurisdiction where the Mortgaged Property is located with respect to the enforceability and perfection of the Mortgages, as amended by such Mortgage Amendments, and other matters customarily included in such opinions and (ii) counsel for the Borrower regarding due authorization, execution and delivery of such Mortgage Amendments, in each case, in form and substance reasonably satisfactory to the Administrative Agent.

SECTION FOUR. Representations and Warranties. In order to induce the Additional Lender and the Administrative Agent to enter into this Amendment, the Borrower represents and warrants to each of the Additional Lender and the Administrative Agent that, after giving effect to this Amendment, and both before and after giving effect to the transactions contemplated by this Amendment:

(a)                                 no Default or Event of Default has occurred and is continuing;

(b)                                 the entry into this Amendment by (x) Holdings, (y) the Borrower and (z) each other Loan Party has been duly authorized by all necessary corporate or other action of each such entity; and

(c)                                  each of the representations and warranties made by each of the Loan Parties in or pursuant to the Loan Documents is true and correct in all material respects (except to the extent any such representation or warranty is qualified by “materially,” “Material Adverse Effect” or a

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similar term, in which case such representation and warranty shall be true and correct in all respects) on and as of the date hereof as if made on the date hereof (or, if any such representation or warranty is expressly stated to have been made as of a specific date, in all material respects as of such specific date).

SECTION FIVE. Reference to and Effect on the Loan Documents. On and after the Amendment Effective Date, each reference in the Credit Agreement to “this Agreement,” “hereunder,” “hereof” or words of like import referring the Credit Agreement, and each reference in the Notes and each of the other Loan Documents to “the Credit Agreement,” “thereunder,” “thereof” or words of like import referring to the Credit Agreement, shall mean and be a reference to the Credit Agreement, as amended by this Amendment, and this Amendment shall constitute a “Loan Document” for all purposes under the Credit Agreement. The Credit Agreement, the Notes and each of the other Loan Documents, as specifically amended by this Amendment, are and shall continue to be in full force and effect. The execution, delivery and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Lender or any Agent under any of the Loan Documents, nor constitute a waiver of any provision of any of the Loan Documents.

SECTION SIX. Reaffirmation. Each Loan Party (x) hereby expressly acknowledges the terms of this Amendment and reaffirms, as of the date hereof, the covenants and agreements contained in each Loan Document to which it is a party, including, in each case, such covenants and agreements as in effect immediately after giving effect to this Amendment and the transactions contemplated hereby, (y) by its signature below, hereby affirms and confirms (a) its obligations under each of the Loan Documents to which it is a party, and (b) the pledge of and/or grant of a security interest in its assets which are Collateral to secure such Obligations, all as provided in the Security Documents as originally executed, and acknowledges and agrees that such guarantee, pledge and/or grant shall continue in full force and effect in respect of, and to secure, such Obligations under the Credit Agreement and the other Loan Documents and (z) acknowledges and agrees that each of the Loan Documents in existence as of the date hereof shall be henceforth read and construed in accordance with and so as to give full force and effect to the ratifications, confirmations, acknowledgements and agreements made herein.

SECTION SEVEN. Costs, Expenses and Taxes. The Borrower agrees to pay all reasonable out-of-pocket expenses incurred by the Administrative Agent in connection with the preparation, execution and delivery of this Amendment and the other instruments and documents to be delivered hereunder, if any (including, without limitation, the reasonable fees, charges and disbursements of Cahill Gordon & Reindel LLP, counsel to the Administrative Agent) in accordance with the terms of Section 9.03 of the Credit Agreement.

SECTION EIGHT. Execution in Counterparts. This Amendment may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. Delivery of an executed counterpart of a signature page to this Amendment by telecopy or other electronic transmission shall be effective as delivery of a manually executed counterpart of this Amendment.

SECTION NINE. Governing Law. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

[Signature Pages Follow]

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[Select Medical — Revolver Extension Amendment (Extension)]

[Select Medical — Revolver Additional Credit Extension Amendment (Extension)]

[Select Medical — Revolver Additional Credit Extension Amendment (Extension)]

SCHEDULE I

TO ADDITIONAL CREDIT EXTENSION AMENDMENT

SUBSIDIARY LOAN PARTIES

SCHEDULE II

TO ADDITIONAL CREDIT EXTENSION AMENDMENT

2018 Extended Revolving Commitments