The full definition
Dynamic Number Insertion uses JavaScript to detect the visitor's traffic source (referrer, UTM parameters, GCLID, FBCLID) and replace the phone number on the website with a tracking number unique to that source. When the visitor calls, the call is recorded and attributed to the original ad campaign, keyword, or landing page. Combined with form-based tracking (GCLID, FBCLID capture), DNI completes the attribution loop.
Why it matters in practice
Healthcare practices live and die on calls. Most attribution platforms track form submissions well but lose call attribution entirely — a Google Ads click that becomes a phone call appears as 'direct traffic' in most analytics. DNI fixes this. Practices doing DNI properly typically see 30–50% of their actual lead volume that was previously invisible in analytics.
Real-world examples
- A visitor from a Google Ad for 'IOP near me' sees a unique 833-IOP-1234 number — when they call, it routes to the practice and attributes to that ad
- A visitor from organic search sees the practice's main number
- A visitor from a Meta Ad sees a different tracking number, attributing the call to that Meta campaign
Inside Velant
Velant includes DNI on every plan — 5 tracking numbers on Core, 10 on AI Pro, 20 on AI Advanced, custom pool on Enterprise. Closed-loop attribution back to Google Ads and Meta is included.
Related terms
- GCLID (Google Click ID)A unique identifier appended to Google Ads click URLs that allows offline conversion uploads back to Google Ads for closed-loop attribution and bidding optimization.
- 270/271 Real-Time Eligibility VerificationThe HIPAA standard transaction pair used to verify a patient's insurance coverage in real time. 270 is the request to the payer; 271 is the response.
- HIPAA-Compliant CRMA customer relationship management system designed to handle Protected Health Information (PHI) in accordance with the Health Insurance Portability and Accountability Act of 1996.