How do I verify an applicant's provider status?

You can verify an individual's provider status by visiting This system is a free service provided by ONS to assist individuals and organizations requiring verification of a nurse’s ONS provider card and/or Certificate of Added Qualification in chemotherapy/biotherapy and/or radiation.

Requests for verification that require completion of a verification form or verification on official ONS letterhead must be requested in writing, include payment of a $15 fee, and include the nurse’s full name and home address. Please send requests for written verification to

Questions can be submitted to ONS Customer Relations at or at 866-257-4667, option 2. You can also reach us by selecting "Submit a request" within the ONS Help Center. Business hours are Monday through Friday, 8:30 am–5 pm EST.

Have more questions? Submit a request


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