Exhibit 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 33-48030, 33-48348, 33-65742, 33-93224, 33-12325, 333-27011, 333-56179 and 333-79549) of Vertex Pharmaceuticals Incorporated of our report dated February 16, 2000, except as to the information in Note R for which the date is February 28, 2000, relating to the financial statements, which appears in this Form 10-K. PricewaterhouseCoopers LLP Boston, Massachusetts March 3, 2000