These benchmarks come from EmailAddress.ai's ongoing analysis of 4.2 million healthcare professional records and over 340 million B2B email verifications. We update the numbers quarterly. The goal is to give pharma marketers, healthcare agencies, and commercial ops teams a concrete reference point when evaluating HCP list vendors or diagnosing campaign deliverability problems.
What is a good valid rate for an HCP email list?
A valid rate measures what percentage of email addresses in a list will successfully deliver to a real, active mailbox. For HCP lists, the benchmarks break down by how the list was built and how recently it was refreshed:
| List Type | Valid Rate | Hard Bounce Risk | Status |
|---|---|---|---|
| NPI-verified, quarterly refresh | 91.3% | <2% | Send-ready |
| NPI-verified, bi-annual refresh | 86.8% | 2–4% | Verify first |
| NPI-verified, annual refresh | 81.7% | 4–8% | Re-verify required |
| Purchased list, no NPI (recent) | 74.2% | 8–14% | Re-verify required |
| Email-appended HCP list | 58–68% | 18–30% | Do not send |
| Purchased list, no NPI (12+ months old) | 62–71% | 14–22% | Do not send |
Source: EmailAddress.ai verification analysis, 4.2M HCP records, Q3 2026
The 2% hard bounce threshold matters because Gmail, Microsoft 365, and most major ISPs begin throttling or blocking senders who exceed it. Once your sending domain accumulates hard bounce damage, it affects every future campaign sent from that domain, not just the one that triggered it.
Rule of thumb: If you cannot confirm a list was NPI-verified and refreshed within the past 90 days, run it through email verification before any send. The cost of verification is under $0.01 per record. The cost of a domain-level deliverability problem is measured in weeks of suppressed open rates across your entire email program.
How fast does physician email data decay?
Physician email data decays faster than most B2B contact data because of the volume of practice moves, institutional domain changes, and retirements in the healthcare sector. The overall average across all physician specialties is 24% annually, but the range by specialty is wide:
Source: EmailAddress.ai NPPES cross-validation tracking, 2025–2026
Hospitalists have the highest churn because they frequently rotate between hospitals, often on contract arrangements. Oncologists and radiologists working in academic medical centers or large cancer centers tend to stay in place longer, which keeps their email addresses stable.
The practical implication: if your target specialty is hospitalists or NPs, a list that is six months old may already have 15% stale records. If you are targeting oncologists, a 12-month-old list may still be usable if it was NPI-verified at build time.
What percentage of healthcare domains are catch-all?
In our analysis of 4.2 million HCP records, 31.2% of the email domains involved are configured as catch-all (also called accept-all) domains. These domains accept all inbound email at the server level, which means a standard email verification test cannot determine whether a specific mailbox exists. You get a "valid" result even for a made-up address.
| Organization Type | Catch-All Prevalence | Typical Deliverability (Unverified) |
|---|---|---|
| Academic Medical Centers | 62% | 54–61% |
| Hospital Systems (500+ beds) | 48% | 57–64% |
| Mid-size Hospital Groups | 34% | 60–68% |
| Large Group Practices (50+ MDs) | 29% | 63–71% |
| Independent / Solo Practices | 11% | 78–84% |
Source: EmailAddress.ai domain-level analysis, Q2–Q3 2026
Academic medical centers are the highest catch-all operators because large university IT systems often configure email at the domain level to ensure no messages to faculty or staff are lost. This is why catch-all verification is essential for any campaign targeting physicians at academic hospitals or major IDNs. For a detailed look at how bounce rates compound from catch-all and stale data combined, see HCP email deliverability and bounce rate benchmarks.
Standard email verification returns "valid" for catch-all addresses and stops there. EmailAddress.ai's catch-all verification goes further: every catch-all address is resolved in real time to a binary deliverable or undeliverable result, using behavioral signal analysis and delivery pattern matching across our sending network. There is no "unknown" output for catch-all addresses in our system.
What does the HCP email verification breakdown look like?
Across the HCP records in our database, the full verification breakdown for a freshly built, NPI-verified file is:
| Verification Status | Share of Records | What It Means |
|---|---|---|
| Valid | 61.4% | Confirmed deliverable, real mailbox |
| Catch-all (verified deliverable) | 17.6% | Catch-all domain, delivery confirmed via secondary check |
| Catch-all (verified undeliverable) | 13.6% | Catch-all domain, mailbox confirmed inactive or non-existent |
| Invalid | 5.8% | Hard bounce — mailbox does not exist |
| Unknown / risky | 1.6% | Server timeout, spam trap risk, or role address |
Source: EmailAddress.ai verification breakdown, NPI-verified HCP records, Q3 2026
The full breakdown shows that with proper catch-all verification, total confirmed deliverable reach is 79% (61.4% direct valid plus 17.6% catch-all verified deliverable). The 13.6% of catch-all addresses confirmed undeliverable are suppressed automatically, protecting sender reputation. EmailAddress.ai resolves catch-all addresses in real time to a binary deliverable or undeliverable result, which means no "send and see" guesswork on catch-all domains.
What are the hard bounce thresholds that trigger ISP action?
The thresholds that major email infrastructure providers enforce are:
- Gmail / Google Workspace: Hard bounce above 2% triggers throttling; above 5% triggers potential sending suspension
- Microsoft 365 / Outlook.com: Similar 2% threshold; Microsoft's SmartScreen scoring accumulates over time across campaigns
- SendGrid / Mailgun / AWS SES: Most platforms auto-suppress after 2% hard bounce per campaign; continued violations result in account review
For HCP campaigns specifically, a practical target is staying below 1.5% hard bounce per send. This leaves a margin for edge cases (email address changes between verification and send) without approaching the threshold that triggers ISP-level damage.
Real cost of threshold violations: Once a sending domain exceeds ISP bounce thresholds, deliverability typically drops 15 to 30% across all sends from that domain for 30 to 90 days, even after the underlying list problem is fixed. For pharma marketing teams running multi-touch campaigns, this is a significant disruption to any campaign timeline.
How do these benchmarks compare to general B2B email benchmarks?
HCP email data behaves differently from general B2B contact data in three key ways:
| Metric | General B2B | HCP / Healthcare |
|---|---|---|
| Average valid rate (fresh list) | 76–82% | 61–79% (wide range by source quality) |
| Annual data decay | 20–25% | 22–34% (specialty-dependent) |
| Catch-all domain prevalence | 8–14% | 28–35% |
| Role-based / shared inbox risk | Low | Moderate (practice admin inboxes) |
| NPI cross-validation possible | No | Yes — NPPES registry is public |
Source: EmailAddress.ai comparative analysis, B2B vs. HCP verification datasets
The higher catch-all prevalence in healthcare is the most operationally significant difference. Standard email verification returns "valid" for any catch-all address, which means a large portion of an HCP list appears clean but is not. Resolving catch-all to a definitive deliverable or undeliverable result is the step that separates a usable HCP list from a risky one.
The NPI cross-validation advantage is the offsetting factor. Because every licensed physician and mid-level provider has a public NPI number tied to their specialty, practice address, and license status, HCP data can be anchored to a ground-truth registry in a way that general B2B data cannot. This is why NPI-verified lists consistently outperform non-verified lists by 15 to 20 percentage points in valid rate. See our full breakdown in the HCP email list buyer's guide.
Get a verified HCP sample against these benchmarks
Request a 100-record sample from our NPI-verified HCP database. Full fields, independently testable. You will see the verification breakdown for your target specialty before committing to a full file.
Request a SampleFrequently asked questions
What is a good valid rate for an HCP email list?
A well-maintained, NPI-verified HCP list refreshed quarterly should have a valid rate of 88% or higher. Lists that are refreshed quarterly typically hold 90% to 93% valid rates. If a vendor cannot tell you their refresh cadence, assume the list is not maintained. Email-appended lists or annually refreshed lists commonly fall below 75% valid.
How fast does physician email data decay?
Physician email data decays at roughly 22% to 28% per year on average. High-turnover specialties like hospitalists and urgent care physicians decay faster, around 30% to 35% annually. Low-turnover specialties like oncologists and academic physicians decay more slowly, around 12% to 16% annually.
What percentage of healthcare email domains are catch-all?
Approximately 31% of healthcare organization email domains are configured as catch-all. Academic medical centers are the highest at 62%. Sending to unverified catch-all addresses in HCP lists produces deliverability rates of 48% to 64%, which is why catch-all verification is essential before any HCP campaign.
What hard bounce rate will get an HCP campaign flagged by ISPs?
Most major ISPs begin throttling or blocking senders whose hard bounce rate exceeds 2% in a single campaign. Gmail's sender policy reinforces this threshold. For HCP campaigns, a practical safe target is under 1.5% hard bounce. Lists with a valid rate below 85% will typically exceed 2% bounce on the first send.
How do NP and PA email decay rates compare to physician rates?
Nurse practitioners and physician assistants churn at higher rates than physicians, typically 28% to 34% annually. NPs and PAs change employers more frequently and often transition between clinical and non-clinical roles. This means NP and PA email lists require more frequent refresh than physician lists.
What is the difference in deliverability between NPI-verified and non-verified HCP lists?
NPI-verified HCP lists consistently show valid rates 15 to 20 percentage points higher than non-verified lists at equivalent ages. A freshly built, NPI-verified list will typically show 90% to 93% valid. A purchased HCP list without NPI verification, refreshed annually, will typically show 68% to 76% valid.