The federal provider directory has 2.9 million fax lines and zero email addresses

The CMS National Provider Directory carries a telecom entry for nearly every active practitioner. Here is the complete breakdown of what kind, measured on the 2026-05-08 release across 7,196,385 active Practitioner records:

Telecom systemPractitioners carrying oneShare
phone7,195,27099.98%
fax2,871,69039.9%
email00%
url00%

Not sparse. Not partially populated. Zero email addresses on any of the 7.2 million practitioner records, while fax remains on 2.9 million of them.

Why this happens

NPPES, the upstream source of roughly 90% of these fields, collects a contact email during enumeration but does not carry it into the public dissemination file, so it never reaches the NDH. Fax, a legacy required field from paper-era workflows, is public. The result is a federal directory that can route a referral to a fax machine but cannot route one to an inbox.

Why it matters

  1. Anyone building "contact this provider" gets phone and fax, full stop. If your product assumes email is available somewhere in the record, it is not, on any of the three FHIR resources (Practitioner, PractitionerRole, Location).

  2. Direct messaging fills part of the gap, but it is not email. The NDH Endpoint table carries 1.25 million Direct Trust HISP addresses. Those are clinical-messaging endpoints requiring HISP membership, not addresses a patient or an administrative workflow can reach.

  3. The fax number is a data-quality tell. A directory field that survives from a deprecated workflow while the replacement channel stays at zero says something about which fields get maintained and which get carried forward untouched.

Verify it yourself

The measurement is part of finding H43 (practitioner phone-number reachability). The per-system counts are in the finding notes, the compute script is one capped BigQuery scan, and the raw NDH files are public.