Chip-in at a doc's office

• Health insurance figure
• Insured's contribution
• Health insurance up-front fee
• Patient's liability
• Amount owed by an insurance policy holder
• Doctor's visit expense
• Drug charge?
• Out-of-pocket medical cost
• Patient's obligation

Wiktionary Word definitions in Wiktionary
n. A copayment. vb. To jointly pay with another or others.