Physician Locums Updated May 21, 2025

By Editorial Team

A Quick Guide to Getting a NPI Number for Locum Doctors, Clinicians, Residents & Fellows

Navigating the complexities of the healthcare ecosystem often starts with securing a National Provider Identifier (NPI) number. Whether you're a seasoned locum doctor, a clinician transitioning to a new practice, a medical resident embarking on your career, or a fellow preparing to specialize, understanding the importance of an NPI number is vital.  

This guide is designed to simplify the process, explain why obtaining your NPI is essential, and provide you with actionable steps to get started. By the end, you’ll know exactly why this 10-digit identifier matters and how to secure it quickly. 

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The Importance of an NPI Number for Healthcare Providers 

An NPI number is a unique 10-digit identification number assigned to healthcare providers in the United States. It’s a requirement of the Health Insurance Portability and Accountability Act (HIPAA) and is used in standard healthcare transactions like billing, insurance claims, electronic health records, and communication among providers.  

According to the U.S. Centers for Medicare & Medicaid Services (CMS), the NPI is "intelligence-free," meaning the number itself doesn’t indicate information such as the provider’s specialization or location. Instead, this universal identifier unifies healthcare operations across disciplines and ensures consistency in processing healthcare claims. 

Whether you're prescribing medications, ordering tests, or participating in direct patient care, your NPI plays a crucial role. 

Why Medical Residents Should Get an NPI Number  

If you're a medical resident, you might be wondering, Do medical students have NPI numbers, and do I need one during residency? The answer depends on your responsibilities, but most medical residents should acquire an NPI as early as possible. 

Reasons to Get an NPI as a Resident: 

  • Prescriptions and Orders: If you're prescribing medications, referring patients to specialists, or ordering lab tests, your NPI will be required for these processes to ensure claims are properly reimbursed.
  • Minimized Workflow Delays: Pharmacies, labs, and other healthcare facilities need your NPI to process claims with Medicaid, Medicare, or private insurers. Without it, claims may be delayed or denied entirely.
  • Professional Continuity: Your NPI number follows you throughout your career, even if you change roles, employers, or states. Obtaining one early ensures a seamless transition as you grow professionally.
  • Regulatory Compliance: Many residency programs integrate HIPAA compliance, and NPI registration is often part of this standardization. Preemptively securing an NPI ensures you remain compliant. 

By obtaining your NPI during residency or even as an intern, you'll be better prepared for practical aspects of patient care. 

How to Get an NPI Number 

Fortunately, the process of obtaining an NPI number is straightforward, whether you’re preparing to work as a locum tenens physician or transitioning out of residency. Here’s how to get started: 

Step 1: Gather Required Information 

Before applying, make sure you have: 

  • Your personal details (name, contact information, Social Security Number/Taxpayer Identification Number)
  • Taxonomy code (indicates your specialization or status; for residents, use the code denoting "Student, Health Care" until you’re fully licensed)
  • State medical license information (if already licensed) 

Step 2: Apply Online 

Visit the National Plan and Provider Enumeration System (NPPES) website to submit an application. The system requires you to create a user account. Once logged in, complete the digital application process by providing the necessary details. 

The online application takes about 20 minutes to complete. 

Step 3: Alternative Application Options 

Prefer a paper process? Download and print the NPI Application Form. Mail your completed form to the address provided in the document. 

Step 4: Double-Check Your Application 

Before submission, carefully review all entries to ensure accuracy. Errors in personal or licensing information could delay your number assignment. 

Step 5: Confirmation and Tracking 

After submission, you’ll receive a confirmation email from NPPES. Most applications are processed in 10 days or less. Keep your login credentials ready for tracking status updates or changes. 

Step 6: Transitioning from Residency (Optional) 

When transitioning from residency or fellowship to licensure, update your taxonomy code in the NPPES system. For example, once you become fully licensed, remove the “Student” taxonomy code and replace it with one that aligns with your specialty (e.g., internal medicine, pediatrics). 

Physician working on a laptop entering in patient information
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Why Locum Tenens Physicians Need an NPI Number 

Locum tenens physicians, in particular, rely heavily on their NPI numbers due to the versatile nature of their work. Locums often transition between different settings and may even work multiple temporary assignments across states. Here’s why having an NPI is critical: 

  • Assignment Approvals: Hospitals and clinics often require an NPI to verify your credentials before allowing you to begin work.
  • Insurance Claims: If you're billing insurers or Medicare/Medicaid directly, inputting an individual NPI ensures payments are attributed correctly.
  • Using Your Records Across Jobs: Each assignment may require documenting medical records, patient histories, or other activities where your NPI is important. 

For short-term assignments (fewer than 60 days), employers may use the NPI of the provider you're replacing. However, for extended engagements, your own NPI is essential. 

Avoid the Risks of Operating Without an NPI 

While it may be easy to postpone obtaining an NPI, delays can cause serious disruptions in professional life: 

  • Payment Delays or Denials: Claims submitted without a proper NPI may experience financial holdups.
  • Non-Compliance Fines: Failing to comply with HIPAA standards (which require you to provide NPIs where applicable) can result in penalties.
  • Professional Gaps: Without an NPI, you may miss out on valuable job or locum tenens opportunities due to administrative issues. 

Given the relatively simple application process, there’s no reason to take these risks. 

Resources for Getting Started 

Here’s a quick reference to streamline your process: 

Take the First Step Today 

Obtaining an NPI number is one of the simplest yet most impactful steps you can take to ensure your healthcare career runs smoothly. From medical students and residents to locum tenens clinicians, every healthcare provider benefits from the standardization and compliance NPIs provide. 

Whether you're just starting out or preparing for new opportunities, securing your NPI today will eliminate future hurdles. Begin your application now through the NPPES portal, or consult these helpful resources for additional guidance. 

Looking to explore locum tenens assignments or further resources? AMN Healthcare offers tools, advice, and job opportunities tailored to your professional growth. Contact AMN Healthcare today! 

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