In Arizona, a lien "is a charge or encumbrance upon property to secure the payment or performance of a debt, duty, or other obligation. . . . In the absence of an obligation to be secured there can be no lien." Matlow v. Matlow, 89 Ariz. 293, 297-98, 361 P.2d 648, 651 (1961). Section 33-931(A) provides: Every health care provider is entitled to a lien for the customary charges for care and treatment or transportation of an injured person, on all claims of liability or indemnity except health insurance for damages accruing to the person to whom the services are rendered, or to that person's legal representative, on account of the injuries that gave rise to the claims and that required the services.