Hugh Hefner, the man who created Playboy magazine, is recovering in his Los Angeles mansion from what a Playboy spokeswoman described yesterday as a cerebral vascular spasm. She emphasized that the incident that occurred about nine days ago "was not a stroke." It was brought on by "an anti-inflammatory drug he took for a mild case of pneumonia. He's up and around and fine now" . . .

House Speaker Tip O'Neill is serious about writing a book, and although he has yet to sign a contract, the list of writers who will assist him on the project is narrowing. Two of the writers on the final "short list" that the speaker's agent, Larry Moulter of the Edward J. Acton Agency, is negotiating with are Bob Novak, who cowrote Lee Iacocca's runaway best seller, "Iacocca: An Autobiography," and John Cox, who cowrote New York Mayor Edward Koch's hot book, "Mayor," and who was called in to fix the bestselling "In Search of Excellence" . . .

It will be an unusual political reception in that alcohol won't be served. And for w0015 ----- r e BC-03/19/85-CELEBS 1stadd w0015 03-19 C03 director of advance for the White House, and Reagan pollster Richard Wirthlin, all Mormons, are hosting a party tomorrow for conservative, direct-mail maestro Richard Viguerie at Viguerie's McLean home to give him the opportunity to meet Virginia Mormons to see if they will support his candidacy for lieutenant governor of Virginia . . .

This is a big week for Johann Sebastian Bach in Germany for the 300th anniversary of his birth. And the Washington Bach Consort, believed to be the only American organization officially taking part in the International Bach Festival, will perform in Leipzig, near the church where Kappelmeister Bach spent the last 27 years of his life. As part of the tour, J. Reilly Lewis, head of the consort, will perform a harpsichord recital in Prague . . .

Former prima donna Beverly Sills, now director of the New York City Opera, was in town yesterday autographing records at Tower Records and speaking at a luncheon for Wolf Trap at the Four Seasons Hotel. Also at the $40-a-head luncheon were Barbara Bush and Health and Human Services Secretary Margaret Heckler . . .