medical treatment at one's own expense; treatment not covered by health insurance
Refers to medical care that the patient pays for entirely themselves, without using public health insurance. Often contrasted with 保険診療 (insurance-covered treatment).
See also: 自由診療
Both 自由診療 and 自費診療 often refer to medical treatment not covered by insurance.
This clinic offers cosmetic dermatology services as self-pay treatment.