What's the difference between these modifiers?
D001706:Biopsy / Q000145:classification / Q000191:economics; D039702:Current Procedural Terminology; D005568:Forms and Records Control / Q000145:classification*; D006801:Humans; D007344:Insurance Claim Reporting / Q000145:classification*; D012878:Skin Neoplasms / Q000191:economics / Q000601:surgery; D013514:Surgical Procedures, Operative / Q000145:classification* / Q000191:economics; D014481:United States