Yes, it’s possible to have multiple NPIs under one Tax ID, but it’s not recommended. For practice managers, healthcare providers, and owners, maintaining separate NPIs and Tax IDs for each practice or provider ensures smoother billing, accurate reimbursements, and compliance with regulations. Keeping them distinct minimizes administrative errors, reduces legal risks, and maintains clarity in financial and operational processes. Simplify your practice management by avoiding shared NPIs under a single Tax ID.