A lien is created: 1. By contract of the parties; or, 2. By operation of law. Ca. Civ. Code § 2881 Enacted 1872.

(a) Subject to the provisions of Section 23004.3, in any case in which the county is authorized or required by law to furnish hospital, medical, surgical, or dental care and treatment, including prostheses and medical appliances, to a person who is injured or suffers a disease, under circumstances creating a tort liability upon some third person to pay damages therefor, the county shall have a right to recover from said third person the reasonable value of the care and treatment so furnished or to

(a) No lien asserted by a licensee of the Department of Managed Care or the Department of Insurance, and no lien of a medical group or an independent practice association, to the extent that it asserts or enforces a lien, for the recovery of money paid or payable to or on behalf of an enrollee or insured for health care services provided under a health care service plan contract or a disability insurance policy, when the right of the licensee, medical group, or independent practice association to