**EXHIBIT 31.1****CERTIFICATIONS**I, Thomas W. Erickson, President and Chief Executive Officer, certify that: 1. I have reviewed this quarterly report on Form 10-Q of National Medical HealthCard Systems, Inc. (the “Registrant”);  2. Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statements made,in light of the circumstances under which such statements were made, not misleadingwith respect to the period covered by this report;  3. Based on my knowledge, the financial statements, and other financialinformation included in this report, fairly present in all material respects thefinancial condition, results of operations and cash flows of the Registrant as of, andfor, the periods presented in this report;  4. The Registrant’s other certifying officer(s) and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined in ExchangeAct Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (asdefined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant, and have:a) designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure thatmaterial information relating to the Registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;b) designed such internal control over financial reporting, or caused such internalcontrol over financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance withgenerally accepted accounting principles;c) evaluated the effectiveness of the Registrant’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness ofthe disclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; andd) disclosed in this report any change in the Registrant’s internal control overfinancial reporting that occurred during the Registrant’s most recent fiscal quarter(the Registrant’s fourth fiscal quarter in the case of an annual report) that hasmaterially affected, or is reasonably likely to materially affect, the Registrant’sinternal control over financial reporting; and 5. The Registrant’s other certifying officer(s) and I have disclosed, based on ourmost recent evaluation of internal control over financial reporting, to theRegistrant’s auditors and the audit committee of the Registrant’s board of directors(or persons performing the equivalent functions):
 

 
a) all significant deficiencies and material weaknesses in the design or operationof internal control over financial reporting which are reasonable likely toadversely affect the Registrant’s ability to record, process, summarize and reportfinancial information; andb) any fraud, whether or not material, that involves management or other employeeswho have a significant role in the Registrant’s internal control over financialreporting.Date: November 8, 2007              /s/ Thomas W. Erickson   Thomas W. Erickson   President and Chief Executive Officer