Domain Authority Is a Vendor Metric, Not a Google One

August 19, 2026

Every hospital system runs at least one proprietary risk score. A readmission index built by an EHR vendor, a severity algorithm bundled into a lab panel, a “quality” number a device rep prints on a slide.

These aren’t nothing. They come from real data and a real formula.

But the formula belongs to the vendor. CMS didn’t write it, nobody validated it as a clinical instrument, and moving the number doesn’t move the outcome it resembles.

You learned early to ask who built a score and what they built it to do, before you let it change how you practice.

Domain Authority deserves the same question. It sounds like a Google number, mostly because “authority” is the word Google itself reaches for when it talks about ranking factors. It isn’t one.

Domain Authority is proprietary to Moz, a marketing software company, built from its own crawl of the web and its own formula for what counts as a strong backlink profile.

Google has never confirmed the score feeds rankings, and it can’t, since Google doesn’t use it.

Ahrefs, another vendor, publishes a similar number called Domain Rating off a different crawl and a different formula, so a practice can carry a high Domain Rating and a middling Domain Authority, or the reverse.

Two private companies measuring the same site two different ways will disagree. Neither number shows up anywhere in Google’s own documentation of how it ranks a page.

Why the number shows up in your report anyway

Domain Authority survives in monthly reports because it’s easy to move and easy to chart.

A vendor can point a batch of directory listings and low-effort backlinks at your site, watch the score climb over a few months, and never once touch whether a single patient found your practice through a Google search.

The chart goes up and to the right. It looks like proof of work.

Now compare the metric that actually correlates with new patients. Where does your practice rank when someone nearby searches “OBGYN accepting new patients” or “pediatric dermatologist near me”?

That number moves slowly, resists manufacture, and lives at the level of your specialty and your zip code.

A vendor chasing Domain Authority gets to show you improvement every month. A vendor chasing your rankings is working on something slower, and much easier for you to check.

Authority scores are domain-wide. Ranking happens page by page, and a page’s relevance to one specific search outweighs whatever the domain’s aggregate score says.

So a hospital system’s homepage can carry a high Domain Authority earned over decades of press coverage and still have nothing that ranks for “fibroid specialist” in your town, because nobody ever built a page there to answer that question.

Meanwhile a two-physician practice with a modest Domain Authority can outrank that hospital system for the exact phrase a patient typed, on the strength of one page written specifically to answer it.

The domain-wide score never predicted that, and it was never built to.

What Domain Authority hides

A high Domain Authority score can sit on top of a site with:

• No page that actually targets the conditions patients in your area search for
• Pages that exist but read too thin or too generic to answer what the search was really asking
• A backlink profile padded with directory submissions that add to the score without sending a single referral
• Zero connection to whether the phone rings or the booking form gets submitted

None of that shows up when a vendor reports “Domain Authority up 8 points this quarter.” The score can climb all quarter while nothing about what a patient sees changes at all.

What to ask for instead

The honest replacements are specific and checkable:

1. Rankings for the searches a patient in your area would actually run. The phrases tied to your specialty and your city. “Endometriosis specialist [city].” “Second opinion OBGYN near me.” That specific, down to the wording, because a category like “SEO” or “healthcare” tells you nothing. Ask which positions moved, and for which exact terms.
2. Calls and form submissions traceable to search. A tracking number, or one form field asking how someone found you, turns “traffic” into a number you can hold up against your own front desk log month over month.
3. New patient bookings that trace back to a Google search. That was always the point. Everything upstream of it, Domain Authority included, exists only to explain how you got there, or why you didn’t.

If a vendor can’t connect their reported metric to one of those three, it’s decoration.

Two questions for your vendor

Pull your last two or three monthly reports and look for the word “authority.” If it’s there, and nothing near it explains a ranking for a specific patient search or a change in calls and bookings, ask directly.

Which searches did we move on this quarter? And how many new patients trace back to them?

A vendor doing real work answers in a sentence. A vendor who spent the quarter charting Domain Authority will go hunting for the number and take a while, because nobody was tracking it.

Photograph: Mikhail Nilov / Pexels