NEW YORK–(BUSINESS WIRE)–Halper Sadeh LLC, an investor rights law firm, is investigating the sale of Surgery Partners, Inc. (NASDAQ: SGRY) to HealthSpan Partners for $23.50 in cash per share.Halper Sadeh encourages Surgery Partners shareholders to click here to learn more about their rights and options or contact Daniel Sadeh or Zachary Halper free of charge at (212) 763-0060 or sadeh@halpersadeh.com or zhalper@halpersadeh.com.The investigation concerns whether Surgery Partners and its board o