title: Coding for headache.
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Silberstein
authors.forename: Laura B
authors.initials: LB
authors.lastname: Powers
mesh_terms: D059019:Clinical Coding / Q000379:methods*; D006261:Headache / Q000145:classification / Q000175:diagnosis / Q000628:therapy; D006801:Humans; D038801:International Classification of Diseases