Can I be denied a government service for not providing an Aadhaar number?

Aadhaar's mandatory use has been the subject of significant judicial scrutiny, with courts clarifying that it can be made mandatory for specific purposes like receiving government subsidies and benefits funded from the Consolidated Fund of India, but not universally required for every kind of service or private transaction.

Whether Aadhaar can genuinely be insisted upon for the specific service you're trying to access depends on the exact nature of that service and the specific legal basis (if any) the department is relying on to require it — this is a fairly technical, context-specific question.

If you believe Aadhaar is being wrongly insisted upon for a service where it shouldn't be mandatory, you can seek clarification through an RTI request about the specific legal basis for the requirement, and if necessary, consult a lawyer about challenging it, since this remains an actively evolving and sometimes contested area of law.