EXHIBIT 3.13 Certificate No. 6595 -------- STATE OF ILLINOIS OFFICE OF THE SECRETARY OF STATE [LOGO] TO ALL TO WHOM THESE PRESENTS SHALL COME, GREETING: WHEREAS, ARTICLES OF INCORPORATION, duly signed and verified of DU PAGE DIALYSIS, LTD. incorporated under the laws of the State of ILLINOIS have been filed in the Office of the Secretary of State as provided by The "Business Corporation Act" of Illinois, in force July 13, A.D. 1933. Now Therefore, I, ALAN J. DIXON, Secretary of State of the State of Illinois by virtue of the powers vested in me by law, do hereby issue this certificate and attach thereto a copy of the Application of the aforesaid corporation. IN TESTIMONY WHEREOF, Thereto set my hand and cause to be affixed the Great Seal of the State of Illinois, Done at the City of Springfield, this 30th day of April (SEAL) A.D. 1979 and of the Independence of the United States the two hundred and 3rd /s/ Alan J. Dixon ----------------------------------- SECRETARY OF STATE FORM B C A-47 BEFORE ATTEMPTING TO EXECUTE THESE BLANKS BE SURE TO READ CAREFULLY THE INSTRUCTIONS ON THE BACK THEREOF. (THESE ARTICLES MUST BE FILED IN DUPLICATE) -------------------------------- (Do note write in this space) STATE OF ILLINOIS, ) Date Paid 4/30/79 )ss. Initial License Fee $ .50 ) Franchise Tax $31.25 COOK COUNTY _______________ ) Filing Fee $75.00 TO ALAN J. DIXON, Secretary of State Clerk /s/ JP $106.75 -------------------------------- The undersigned, - -------------------------------------------------------------------------------- Address Name Number Street City State - -------------------------------------------------------------------------------- LUIS E. CESPEDES, M.D. 79 W. Monroe, Suite 700, Chicago, Il.60603 - -------------------------------------------------------------------------------- ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ being one or more natural persons of the age of twenty-one years or more or a corporation, and having subscribed to shares of the corporation to be organized pursuant hereto, for the purpose of forming a corporation under "The Business Corporation Act" of the State of Illinois, do hereby adopt the following Articles of Incorporation: ARTICLE ONE The name of the corporation hereby incorporated is: DU PAGE DIALYSIS, LTD. ARTICLE TWO The address of its initial registered office in the State of Illinois is: Suite 700, 79 W. Monroe Street, in the City of Chicago (60603) County of Cook and the (Zip Code) name of its initial Registered Agent at said address is: Bernard Kleinman ARTICLE THREE The duration of the corporation is: perpetual ARTICLE FOUR The purpose or purposes for which the corporation is organized are: MEDICAL CORPORATION: To own, operate and maintain an establishment for the study, diagnosis and treatment of human ailments and injuries, whether physical or mental and to promote medical, surgical and scientific research and knowledge, specializing in nephrology and dialysis; provided, that medical or surgical treatment, consultation or advice may be given by employees of the corporation only if they are licensed pursuant to the Medical Practice Act. ARTICLE FIVE PARAGRAPH 1: The aggregate number of shares which the corporation is authorized to issue is 100,000, divided into one classes. The designation of each class, the number of shares of each class, and the par value, if any, of the shares of each class, or a statement that the shares of any class are without par value, are as follows: Series Number of Par value per share of statement that shares Class (If any) Shares are without par value Common None 100,000 $1.00 PARAGRAPH 2: The preferences, qualifications, limitations, restrictions, and the special or relative rights in respect of the shares of each class are: None ARTICLE SIX The class and number of shares which the corporation proposes to issue without further report to the Secretary of State, and the consideration (expressed in dollars) to be received by the corporation therefor, are: Total consideration to be Class of shares Number of shares received therefor: Common 1,000 $ 1,000.00 $ ARTICLE SEVEN The corporation will not commence business until at least one thousand dollars has been received as consideration for the issuance of shares. ARTICLE EIGHT The number of directors to be elected at the first meeting of the shareholders is: Four (4) ARTICLE NINE PARAGRAPH 1: It is estimated that the value of all property to be owned by the corporation for the following year wherever located will be $______ PARAGRAPH 2: It is estimated that the value of the property to be located within the State of Illinois during the following year will be $_______ PARAGRAPH 3: It is estimated that the gross amount of business which will be transacted by the corporation during the following year will be $______ PARAGRAPH 4: It is estimated that the gross amount of business which will be transacted at or from places of business in the State of Illinois during the following year will be $______ NOTE: If all the property of the corporation is to be located in this State and all of its business is to be transacted at or from places of business in this State, or if the incorporators elect to pay the initial franchise tax on, the basis of its entire stated capital and paid-in surplus, then the information called for in Article Nine need not be stated. /s/ Luis E. Cespedes, M.D. -------------------------------- LUIS E. CESPEDES, M.D. -------------------------------- -------------------------------- -------------------------------- } Incorporators -------------------------------- -------------------------------- -------------------------------- NOTE: There may be one or more incorporators. Each incorporator shall be either a corporation, domestic or foreign, or a natural person of the age of twenty-one years or more. If a corporation acts as incorporator, the name of the corporation and state of incorporation shall be shown and the execution must be by its President or Vice-President and verified by him, and the corporate seal shall be affixed and attested by its Secretary or an Assistant Secretary. OATH AND ACKNOWLEDGMENT STATE OF ILLINOIS ) ) ss. COOK County ) I, NANCY PATRICK, A Notary Public, do hereby certify that on the 22 day of March 1979 LUIS E. CESPEDES, M.D. personally appeared before me and being first duly sworn by me acknowledged the signing of the foregoing document in the respective capacities therein set forth and declared that the statements therein contained are true. IN WITNESS WHEREOF, I have hereunto set my hand and seal the day and year above written. Place (NOTARIAL SEAL /s/ Nancy Patrick ---------------------------- Here Notary Public FORM B C A-47 ================================================================================ ARTICLES OF INCORPORATION ________________________________________________________________________________ ================================================================================ The following fees are required to be paid at the time of issuing Certificate of Incorporation: Filing fee $75.00; Initial license fee of 50c per $1,000.00 or 1/20th of 1% of the amount of stated capital and paid-in surplus the corporation proposes to issue without further report (Article Six): Initial franchise tax of 1/10th of 1% of the issued, as above noted. However, the minimum initial franchise tax is $25.00 and varies monthly on $25,000, or less, as follows: January, $37.50; February, $35.42; March, $33.33; April, $31.25; May, $29.17; June, $27.08; July, $25.00; August, $22.92; September, $20.83; October, $18.75; November, $16.67; December, $14.58; (See Sec. 133 BCA). In excess of $25,000, the franchise tax per $1,000.00 is as follows: Jan., $1.50; Feb., 1,4167; March, 1.3334; April, 1.25; May, 1.1667; June, 1.0834; July, 1.00; Aug., .9167; Sept., .8334; Oct., .75; Nov., .6667; Dec., .5834. All shares issued in excess of the amount mentioned in article Six of this application must be reported within 60 days from date of issuance thereof, and franchise tax and license fee paid thereon; otherwise, the corporation is subject to a penalty of 1% for each month on the amount until reported and subject to a fine of not to exceed $500.00. The same fees are required for a subsequent issue of shares except the filing fee is $1.00 instead of $75.00. /s/ Allan J. Dixon Secretary of State ================================================================================ File Number 5173-474-2 STATE OF ILLINOIS OFFICE OF THE SECRETARY OF STATE WHEREAS, ARTICLES OF AMENDMENT TO THE ARTICLES OF INCORPORATION OF DU PAGE DIALYSIS, LTD. INCORPORATED UNDER THE LAWS OF THE STATE OF ILLINOIS HAVE BEEN FILED IN THE OFFICE OF THE SECRETARY OF STATE AS PROVIDED BY THE BUSINESS CORPORATION ACT OF ILLINOIS, IN FORCE JULY 1, A.D. 1984. Now Therefore, I George H. Ryan, Secretary of State of the State of Illinois, by virtue of the powers vested in me by law, do hereby issue this certificate and attach a copy of the Application of the aforesaid corporation. IN TESTIMONY WHEREOF, I hereto set my hand and cause to be affixed the Great Seal of the State of Illinois at the City of [SEAL] Springfield this 9TH day of APRIL A.D. 1996 and of the Independence of the United States the two hundred and 20th. /s/ George H. Ryan Secretary of State Form BCA-10.30 ARTICLES OF AMENDMENT (Rev. Jan. 1995) File # D5173-474-2 - -------------------------------------------------------------------------------- George H. Ryan SUBMIT IN DUPLICATE Secretary of State Department of Business Services This space for use by Springfield, IL 62756 Secretary of State Telephone (217) 782-1832 - ------------------------------- Date 4-9-96 Remit payment in check or money Franchise Tax $ order, payable to "Secretary of Filing Fee* $ 25.00 State." Penalty $ GEORGE H. RYAN *The filing fee for articles of SECRETARY OF STATE Approved: amendment - $25.00 - -------------------------------------------------------------------------------- 1. CORPORATE NAME: DuPage Dialysis, Ltd. ------------------------------------------------------------ (Note 1) 2. MANNER OF ADOPTION OF AMENDMENT: The following amendment of the Articles of Incorporation was adopted on 3-23, 1995 in the manner indicated below. ("X" one box only) [_] By a majority of the incorporators, provided no directors were named in the articles of incorporation and no directors have been elected; (Note 2) [_] By a majority of the board of directors, in accordance with Section 10.10, the corporation having issued no shares as of the time of adoption of this amendment; (Note 2) [_] By a majority of the board of directors, in accordance with Section 10.15, shares having been issued but shareholder action not being required for the adoption of the amendment; (Note 3) [_] By the shareholders, in accordance with Section 10.20, a resolution of the board of directors having been duly adopted and submitted to the shareholders. At a meeting of shareholders, not less than the minimum number of votes required by statute and by the articles of incorporation were voted in favor of the amendment; (Note 4) [_] By the shareholders, in accordance with Sections 10.20 and 7.10, a resolution of the board of directors having been duly adopted and submitted to the shareholders. A consent in writing has been signed by shareholders having not less than the minimum number of votes required by statute and by the articles of incorporation. Shareholders who have not consented in writing have been given notice in accordance with Section 7.10; (Notes 4 & 5) [X] By the shareholders, in accordance with Sections 10.20 and 7.10, a resolution of the board of directors having been duly adopted and submitted to the shareholders. A consent in writing has been signed by all the shareholders entitled to vote on this amendment. (Note 5) 3. TEXT OF AMENDMENT: a. When amendment effects a name change, insert the new corporate name below. Use Page 2 for all other amendments. Article 1: The name of the corporation is: ________________________________________________________________________________ (NEW NAME) All changes other than name, include on page 2 (over) TEXT OF AMENDMENT b. (If amendment affects the corporate purpose, the amended purpose is required to be set forth in its entirety. If there is not sufficient space to do so, add one or more sheets of this size.) RESOLVED, that Article Four of the Articles of Incorporation is hereby amended to read as follows: "The purpose or purposes or which the corporation is organized are: To maintain and conduct any and every kind of sales, distribution, leasing, investment, and service business; to manufacture, process, fabricate, rebuild, service, invest in, purchase, sell, lease or otherwise dispose of and generally deal in and with raw materials, products, wares, goods, merchandise and real and personal property, both tangible and intangible, of every kind and description; to make investments of every kind and nature; and to provide services of every kind and character. To aquire, own, use, convey and otherwise dispose of and deal in real property." The corporation elects to be governed by the Business Corporation Act and will not engage in the practice of medicine. PAGE 2 4. The manner, if not set forth in Article 3b, in which any exchange, reclassification or cancellation of issued shares, or a reduction of the number of authorized shares of any class below the number of issued shares of that class, provided for or effected by this amendment, is as follows: (If not applicable, insert "No change") No change 5. (a) The manner, if not set forth in Article 3b, in which said amendment effects a change in the amount of paid-in capital (Paid-in capital replaces the terms Stated Capital and Paid-in Surplus and is equal to the total of these accounts) is as follows: (If not applicable, insert "No change") No change (b) The amount of paid-in capital (Paid-in Capital replaces the terms Stated Capital and Paid-in Surplus and is equal to the total of these accounts) as changed by this amendment is as follows: (If not applicable, insert "No Change") No change Before Amendment After Amendment Paid-in Capital $_________ $_________ (COMPLETE EITHER ITEM 6 OR 7 BELOW. ALL SIGNATURES MUST BE IN BLACK INK.) --------- 6. The undersigned corporation has caused this statement to be signed by its duly authorized officers, each of whom affirms, under penalties or perjury, that the facts stated herein are true. Dated 3-23 1996 DuPage Dialysis, Ltd. ------------------------, -- ------------------------------ (Exact Name of Corporation & state of execution attested by /s/ L E Cespedes MD by /s/ Paul Balter -------------------------- --------------------------- (Signature of Secretary or (Signature of President or Assistant Secretary Vice President Luis E. Cespedes, M.D., Secy. Paul Balter, M.D., President ------------------------------ ------------------------------ (Type or Print Name and Title) (Type or Print Name and Title) 7. If amendment is authorized pursuant to Section 10.10 and there are no officers, then a majority of the directors or such directors as may be designated by the board, must sign below, and type or print name and title. OR If amendment is authorized by the directors pursuant to Section 10.10 and there are no officers, then a majority of the directors or such directors as may be designated by the board, must sign below, and type or print name and title. The undersigned affirms, under the penalties of perjury, that the facts stated herein are true. Dated_________________________, 19__ ____________________________________ __________________________________ ____________________________________ __________________________________ ____________________________________ __________________________________ ____________________________________ __________________________________ Page 3 NOTES AND INSTRUCTIONS NOTE 1: State the true exact corporate name as it appears on the records of the office of the Secretary of State, BEFORE any amendments herein reported. NOTE 2: Incorporators are permitted to adopt amendments ONLY before any shares have been issued and before any directors have been named or elected. ((S) 10.10) NOTE 3. Directors may adopt amendments without shareholder approval in only seven instances, as follows: (a) to remove the names and addresses of directors named in the articles of incorporation; (b) to remove the name and address of the initial registered agent and registered office, provided a statement pursuant to (S) 5.10 is also filed; (c) to increase, decrease, create or eliminate the par value of the shares of any class, so long as no class or series of shares is adversely affected. (d) to split the issued whole shares and unissued authorized shares by multiplying them by a whole number, so long as no class or series is adversely affected thereby; (e) to change the corporate name by substituting the word "corporation", "incorporated", "company", "limited", or the abbreviation "corp", "inc.", "co.", or "ltd." for a similar word or abbreviation in the name, or by adding a geographical attribution to the name; (f) to reduce the authorized shares of any class pursuant to a cancellation statement filed in accordance with (S) 9.05, (g) to restate the articles of incorporation as currently amended. ((S) 10.15) NOTE 4: All amendments not adopted under (S) 10.10 or (S) 10.15 require (1) that the board of directors adopt a resolution setting forth the proposed amendment and (2) that the shareholders approve the amendment. Shareholder approval may be (1) by vote at a shareholders' meeting (either annual or special) or (2) by consent, in writing, without a meeting. To be adopted, the amendment must receive the affirmative vote or consent of the holders of at least 2/3 of the outstanding shares entitled to vote on the amendment (but if class voting applies, then also at least a 2/3 vote within each class is required). The articles of incorporation may supersede the 2/3 vote requirement by specifying any smaller or larger vote requirement not less than a majority of the outstanding shares entitled to vote and not less than a majority within each class when class voting applies. ((S) 10.20) NOTE 5: When shareholder approval is by consent, all shareholders must be given notice of the proposed amendment at least 5 days before the consent is signed. If the amendment is adopted, shareholders who have not signed the consent must be promptly notified of the passage of the amendment. ((S)(S)7.10 & 10.20) Page 4 BCA 5.10/5.20 (Rev. Jul. 1984) File # D 5173-474-2 ---------------------------- JIM EDGAR This Space For Use By Submit in Duplicate Secretary of State Secretary of State State of Illinois Remit payment in Check or Money Date 6-25-86 Order, payable to "Secretary of State", STATEMENT OF CHANGE OF REGISTERED AGENT Filing Fee $5.00 DO NOT SEND CASH! AND/OR REGISTERED OFFICE Clerk ---------------------------- Pursuant to the provisions of "The Business Corporation Act of 1983", the undersigned corporation hereby submits the following statement. 1. The name of the corporation is DU PAGE DIALYSIS, LTD. -------------------------------------------- ___________________________________________________________________________ 2. The State or Country of incorporation is Illinois ---------------------------------- 3. The name and address of its registered agent and its registered office as they appear on the records of the office of the Secretary of State (Before Change) are: Registered Agent David J. Hochman ---------------------------------------------------- First Name Middle Name Last Name Registered Office 70 W. Madison, Suite 2200 ---------------------------------------------------- Number Street Suite No.(A P.O. Box alone is not acceptable) Chicago, IL 60602 Cook ---------------------------------------------------- City Zip Code County 4. The name and address of its registered agent and its registered office shall be (After All Changes Herein Reported): Registered Agent David J. Hochman ---------------------------------------------------- First Name Middle Name Last Name Registered Office 30 N. LaSalle Street ---------------------------------------------------- Number Street Suite No.(A P.O. Box alone is not acceptable) Chicago, IL 60602 Cook ---------------------------------------------------- City Zip Code County 5. The address of the registered office and the address of the business office of the registered agent, as changed, will be identical. 6. The above change was authorized by: ("X" one box only) a. [_] By resolution duly adopted by the board of directors. (Note 5) b. [X] By action of the registered agent. (Note 6) (IF AUTHORIZED BY THE BOARD OF DIRECTORS, SIGN HERE. SEE NOTE 5) The undersigned corporation has caused this statement to be signed by its duly authorized officers, each of whom affirm, under penalties of perjury, that the facts stated herein are true. Dated ________________________________, 19____ ______________________________________________________ (Exact Name of Corporation) attested by __________________________________ by ___________________________________________________ (Signature of Secretary or (Signature of President or vice president) Assistant Secretary) __________________________________ ___________________________________________________ (Type or Print Name and Title) (Type or Print Name and Title) (IF CHANGE OF REGISTERED OFFICE BY REGISTERED AGENT, SIGN HERE. SEE NOTE 6) The undersigned, under penalties of perjury, affirms that the facts stated herein are true. Dated June 6, 1986 /s/ David J. Hochman ------- ---- ------------------------------------------------- (Signature of Registered Agent of Record) NOTES 1. The registered office may, but need not be the same as the principal office of the corporation. However, the registered office and the office address of the registered agent must be the same. 2. The registered office must include a street or road address, a post office box number alone is not acceptable. 3. A corporation cannot act as its own registered agent. 4. If the registered office is changed from one county to another, then the corporation must file with the recorder of deeds of the new county a certified copy of the artilces of incorporation and a certified copy of the statement of change of registered office. Such certified copies may be obtained ONLY from the Secretary of State. 5. Any change of REGISTERED AGENT must be by resolution adopted by the board of directors. This statement must then be signed by the President (or vice- president) and by the Secretary (or an assistant secretary). 6. The registered agent may report a change of the REGISTERED OFFICE of the corporation for which he or she is registered agent. When the agent reports such a change, this statement must be signed by the registered agent. FORM BCA-6.10/6.20 File No. D-5173-474-2 ================================================================================ STATEMENT OF CHANGE OR REGISTERED AGENT AND/OR REGISTERED OFFICE FILING FEE $5.00 Return to: David J. Hockman, Esq. Finger, Hochman & Delott, P.C. 30 North LaSalle Street Chicago, IL 60602 RETURN TO: CORPORATION DEPARTMENT SECRETARY OF STATE SPRINGFIELD, ILLINOIS 62756 TELEPHONE 217 - 782-7808 ================================================================================ STATE OF ILLINOIS Office of the Secretary of State I hereby certify that this is a true and correct copy, consisting of Twelve pages, as taken from the original on file in this office. /s/ George H. Ryan EXPEDITED SECRETARY OF STATE [SEAL] GEORGE H. RYAN SECRETARY OF STATE APR 27 1998 EXP. FEES 25.00 ---------- DATED: APRIL 27, 1998 COPY - CERT. 11.00 ------------------------ -------- BY: /s/ James P. Lesley, Jr. --------------------------