# Tan M Nguyen, M.D., Sunnyvale: an internist in Sunnyvale (2026 guide)

Source: Local AI Registry, https://localairegistry.com/biz/ca/sunnyvale/tan-m-nguyen-m-d-sunnyvale-ca. Free to reuse with a link back.

By Steve Lee, founder and CEO of Local AI Registry. Fact-checked against 32 sources. Updated 2026-10-23. Owner review: not yet.

Canonical: https://localairegistry.com/biz/ca/sunnyvale/tan-m-nguyen-m-d-sunnyvale-ca

## In short

Tan M Nguyen, M.D. is an internist in Sunnyvale, CA. Its AI Score is 41 of 100, which is poor.

Every fact on this page carries one of three marks: Confirmed (from their website, Google Business Profile, review sites, licensing boards, or measured by Local AI Registry), Visitor submitted (added by a person, with a date and how they know), or AI guess (what AI engines like Gemini, Perplexity and ChatGPT are saying, not confirmed by anyone). Every mark points to a reference at the end of this page.


## Key facts

| Fact | Value |
| --- | --- |
| Type | Internist |
| Address | 201 Old San Francisco Rd, Sunnyvale, CA 94086, USA |
| Hours | Mon to Fri 8 AM to 5 PM · Closed Sat to Sun |
| Phone | (408) 730-4256 |
| Owner | Nothing found |
| Rating | 5.0 across 151 reviews |
| Known for | Nothing found |
| Prices | Nothing found |
| Quietest time | Nothing found |
| Parking | Nothing found |
| Last verified | October 22, 2026, 4:39 PM |


## All the details

Every row is something the owner can add or correct. Each one is marked Confirmed, Visitor submitted or AI guess, with where it came from.

| Group | Fact | Value | Mark | Evidence |
| --- | --- | --- | --- | --- |
| Location info | Address | 201 Old San Francisco Rd, Sunnyvale, CA 94086, USA | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Location info | Description | This provider is part of Sutter Health, dedicated to creating a more personalized healthcare experience. | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Location info | Hours | Mon to Fri 8:00 AM to 5:00 PM · Sat to Sun Closed | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Location info | Name | Tan M Nguyen, M.D. | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Location info | Phone | (408) 730-4256 | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Monday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Tuesday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Wednesday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Thursday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Friday | 8:00 AM to 5:00 PM | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Saturday | Closed | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Hours | Sunday | Closed | Confirmed | Google Business Profile, checked Aug 16, 2026 |
| Services | Service | Acute inpatient rehabilitation | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Adult congenital heart disease | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Amyotrophic lateral sclerosis als | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Anesthesia | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Animal assisted therapy | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Audiology | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Autism | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Back spine surgery | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Bariatric surgery | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Behavioral health | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Behavioral health outpatient | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Blood stem cell transplant | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Brain injury rehabilitation | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Breast cancer | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Breast health | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Breast imaging | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Breast reshaping | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cancer case conference | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cancer pain management | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cancer patient navigators | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cancer rehabilitation | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cardiac rehabilitation | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cardiovascular imaging diagnostic | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Cardiovascular surgery | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Child adolescent behavioral health | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Child life program | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Chronic kidney disease | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Colonoscopy | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Colorectal cancer | Confirmed | Business website, checked Sep 18, 2026 |
| Services | Service | Pediatric grief support | Confirmed | Business website, checked Sep 18, 2026 |
| Links | Facebook | https://www.facebook.com/sutterhealth | Confirmed | Business website, checked Oct 22, 2026 |
| Links | Instagram | https://www.instagram.com/sutterhealth | Confirmed | Business website, checked Oct 22, 2026 |
| Links | Website | https://www.sutterhealth.org/find-provider/dr-tan-m-nguyen-1046242838 | Confirmed | Google Business Profile, checked Aug 16, 2026 |


## Services and prices

These are the 30 services Tan M Nguyen, M.D offers, with the price where we have one and where it came from.

| Service | Price | Price mark | Price evidence | Service mark |
| --- | --- | --- | --- | --- |
| Back spine surgery |  |  |  | Confirmed |
| Bariatric surgery |  |  |  | Confirmed |
| Amyotrophic lateral sclerosis als |  |  |  | Confirmed |
| Anesthesia |  |  |  | Confirmed |
| Animal assisted therapy |  |  |  | Confirmed |
| Audiology |  |  |  | Confirmed |
| Autism |  |  |  | Confirmed |
| Behavioral health |  |  |  | Confirmed |
| Behavioral health outpatient |  |  |  | Confirmed |
| Blood stem cell transplant |  |  |  | Confirmed |
| Brain injury rehabilitation |  |  |  | Confirmed |
| Breast cancer |  |  |  | Confirmed |
| Breast health |  |  |  | Confirmed |
| Acute inpatient rehabilitation |  |  |  | Confirmed |
| Adult congenital heart disease |  |  |  | Confirmed |
| Colorectal cancer |  |  |  | Confirmed |
| Pediatric grief support |  |  |  | Confirmed |
| Breast reshaping |  |  |  | Confirmed |
| Cancer pain management |  |  |  | Confirmed |
| Cancer patient navigators |  |  |  | Confirmed |
| Cancer rehabilitation |  |  |  | Confirmed |
| Cardiac rehabilitation |  |  |  | Confirmed |
| Cardiovascular imaging diagnostic |  |  |  | Confirmed |
| Cardiovascular surgery |  |  |  | Confirmed |
| Child adolescent behavioral health |  |  |  | Confirmed |
| Child life program |  |  |  | Confirmed |
| Chronic kidney disease |  |  |  | Confirmed |
| Colonoscopy |  |  |  | Confirmed |
| Breast imaging |  |  |  | Confirmed |
| Cancer case conference |  |  |  | Confirmed |


### Known for

Reviews not read yet, back on Scan Day.


## The team

Nothing found


## Visiting Tan M Nguyen, M.D

Address: 201 Old San Francisco Rd, Sunnyvale, CA 94086, USA. Phone: (408) 730-4256. Hours: Mon to Fri 8 AM to 5 PM · Closed Sat to Sun. (Confirmed, Google Business Profile, checked August 16, 2026 at 8:11 PM.)


### Location info from Google Business Profile

Business description, written by Tan M Nguyen, M.D on its Google Business Profile: "This provider is part of Sutter Health, dedicated to creating a more personalized healthcare experience."


### When to go

Busy times not read yet, back on Scan Day.


### Parking and getting in

Nothing found


### Nearby

| Place | Type | Distance |
| --- | --- | --- |
| Dumpling Depot 水饺家园 | Dumpling restaurant | 2 min walk |
| El Camino & Sunnyvale | Bus station | 2 min walk |
| Boudin SF | Bakery | 3 min walk |
| Dave's Hot Chicken | Chicken restaurant | 3 min walk |
| Sunnyvale-Saratoga & El Camino | Bus stop | 3 min walk |
| El Camino & Sunnyvale-Saratoga | Bus stop | 3 min walk |


## Reputation

5.0 average across 151 reviews.


### What people like

Nothing found


### What people do not like

Nothing found


### Press

No press story about Tan M Nguyen, M.D found yet.


### Awards

None named yet.


### Directories

Directory listings not read yet.


## Recent updates from Tan M Nguyen, M.D

Tan M Nguyen, M.D hasn't posted an update here yet.


## Questions people ask


### parking at Tan M Nguyen, M.D, where does everyone put the car?

No answer yet


### anywhere cheaper than Tan M Nguyen, M.D in Sunnyvale that is still good?

No answer yet


### people keep recommending this place, what for?

No answer yet


### Saturdays at Tan M Nguyen, M.D, are they open?

No answer yet


### Tan M Nguyen, M.D or Teresa Cheng , M.D?

No answer yet


### are prices in Sunnyvale higher than everywhere else

No answer yet


### lunch near Old San, what is good

No answer yet


### anything I should sort out before a first visit here?

No answer yet


### Booking here, how does it work?

No answer yet


### best internist in Sunnyvale

No answer yet


### any last minute slots here?

No answer yet


### what time does Tan M Nguyen, M.D in Sunnyvale actually open?

No answer yet


### address for Tan M Nguyen, M.D, anyone have it?

No answer yet


### points or member pricing at Tan M Nguyen, M.D, worth signing up?

No answer yet


## What AI gets wrong about Tan M Nguyen, M.D

We ask Gemini, Perplexity and ChatGPT about Tan M Nguyen, M.D. These are the answers that disagree with the record.

ChatGPT and Gemini, read by Local AI Registry on Oct 22, 2026. Perplexity via DataForSEO on Oct 22, 2026.

No capture has disagreed with the record yet.


## The AI Score: 41 of 100

The AI Score measures how likely AI engines are to recommend a business, and how accurately. Sunnyvale internists run 38 to 49. Fair starts at 45, good at 65. Tan M Nguyen, M.D scores 41, below the Sunnyvale average of 43. The same method scores every business on the registry.

| Signal | Weight | Score | What it measures | Tan M Nguyen, M.D |
| --- | --- | --- | --- | --- |
| Retrieval grounding | 26 | 50 | Whether you appear in the ranked results AI retrieves and cites: AI-Overview citations, organic top-10 for your money queries, and the Bing index ChatGPT leans on. | Fair |
| Off-property attestation | 20 | 39 | Volume and consistency of what others say about you: YouTube mentions, branded web mentions, third-party “best-of” lists. The cause of retrievability. | Poor |
| AI visibility | 14 | 6 | Whether ChatGPT, Gemini, Perplexity, and AI Overviews name you, and whether they name you for the right service. | Named in 1 of 18 answers that recommended anyone. 17 more named nobody, which is not a loss and is not scored. |
| Reviews & response | 12 | 59 | The star average is only one input. We also read volume, velocity, the specificity of review language, and response cadence. Specific reviews are what AI quotes verbatim. | Fair |
| Backlink & citation authority | 8 | 68 | Domain authority and editorial quality of the sources that attest to you. | Good |
| Google Business Profile | 8 | 79 | Required and recommended fields; update cadence. The listing AI pulls from first. | Good |
| Speed & mobile | 7 | 46 | Core Web Vitals at the 75th percentile, on a real phone. | Fair |
| Content freshness & schema | 5 | 81 | Crawl recency, intent alignment, valid JSON-LD, canonicals. | Good |

Full method: https://localairegistry.com/methodology


## How AI decides what to tell you about an internist

When you ask ChatGPT, Gemini or Google about a local business, the AI doesn't visit it. It reads what's already written about it: the business's website, its Google Business Profile, review sites, news stories and directories like this one. Then it repeats what those sources agree on.

That's why AI gets small facts wrong. If Yelp says a place is open Mondays and the website says it isn't, the AI has to pick one. The table above shows the answers that disagree with the record today.

The more sources agree, and the more specific they are, the more confidently AI recommends a business. A review that names who helped and what they did tells an AI far more than one that says "great place."


## How to choose an internist in California, with or without AI

A few checks take ten minutes and tell you more than any rating.

- Check that the hours and phone number match on Google, Yelp and the business's own website. Mismatches are how people end up at a locked door.
- Read reviews that name a person and what they did. Vague praise is easy to fake.
- Look for recent reviews and recent posts. A page nobody has touched in a year may not match the business today.
- Ask for the price before you go, and ask what it includes.
- Where the work needs a license, ask whose license it is and look it up with California.


## How to read the marks on this page

- Confirmed (solid circle): from a known source. The business website, its Google Business Profile, review sites like Yelp, Healthgrades and RealSelf, a licensing board, or measured by Local AI Registry.
- Visitor submitted (hollow circle): added or corrected by a person, with the date and how they know, like a phone call or a visit.
- AI guess (hollow triangle): what AI engines are saying right now. Nobody has confirmed it.


## About the author

Steve Lee is the founder and CEO of Local AI Registry and sets its editorial standards. He is a former Google executive in Search and a former Microsoft executive, with more than 20 years in digital: search, local discovery, and how people find businesses online. He is based in Irvine.

- Expertise: search at Google and Microsoft, AI search, answer engine optimization, generative engine optimization, local SEO, structured data and entity mapping.
- Industry: medical aesthetics, injectables, med spa operations and marketing.
- Disclosure: Local AI Registry sells services to business owners, including Tan M Nguyen, M.D if it claims this page. That does not change what this page says. Every fact carries its source.


## Entity map

Every person, place, organization and treatment named on this page, with a stable ID and a public reference. The JSON-LD below connects them to each other.

| Entity | Type | ID on this page | Same as | Relationship to Tan M Nguyen, M.D |
| --- | --- | --- | --- | --- |
| Tan M Nguyen, M.D. | LocalBusiness | #business | https://www.sutterhealth.org/find-provider/dr-tan-m-nguyen-1046242838 | Subject of this page |
| Sunnyvale, California | City | #city | Nothing found | City Tan M Nguyen, M.D is in |
| Local AI Registry | Organization | #publisher | https://localairegistry.com | Publisher of this page |
| Steve Lee | Person | #author | https://localairegistry.com/team | Author of this page |


## Topical map

Where this page sits in the registry. It's one profile among the internists in Sunnyvale, linked to the lists and towns around it.


### Lists

- Best internists in Sunnyvale: https://localairegistry.com/leaderboards/ca/sunnyvale/internist
- Best businesses in Sunnyvale: https://localairegistry.com/leaderboards/ca/sunnyvale


### Nearby

- /los-angeles: https://localairegistry.com/leaderboards/ca/los-angeles
- /san-francisco: https://localairegistry.com/leaderboards/ca/san-francisco
- /san-jose: https://localairegistry.com/leaderboards/ca/san-jose
- /san-diego: https://localairegistry.com/leaderboards/ca/san-diego
- /irvine: https://localairegistry.com/leaderboards/ca/irvine
- /fresno: https://localairegistry.com/leaderboards/ca/fresno


### Every list

- Every leaderboard in California: https://localairegistry.com/leaderboards/ca


## Frequently asked questions


### What is AI search optimization for local business?

Getting a business named when a neighbor asks ChatGPT, Gemini, or Perplexity for a recommendation. Some call it AI SEO, some call it generative engine optimization. Traditional SEO fights for ten blue links; this fights for the one answer an assistant says out loud. The AI Score on this page measures the eight signals that drive it.


### What is Local AI Registry?

The public record of how AI sees local business. We score every business we list by one published method, we keep the questions people ask about it in one place, and we never sell rank. Looking up any business here is free.


### How does this page help a business get recommended by AI?

Assistants read public pages before they answer. This one states what the business does, what people ask about it, and what the Record answers, in one place a machine can read. Correcting what is wrong here changes what an assistant repeats next.


### Who writes the answers here?

Registry AI writes the first answer under every question, from the Record and the public sources named beneath it. Neighbors write the rest under pseudonyms. A registered owner can reply as the business, and their reply says so.


### I own Tan M Nguyen, M.D.. How do I fix something or rank higher?

Register the page. It is free, it takes about five minutes, and it lets you correct the Record and reply as the business. Nothing on this page is for sale, so the only thing that moves the score is the work.


## References


### Sources cited

- [1] Google Business Profile, https://www.google.com/maps/place/?q=place_id:ChIJA8VOy2W2j4AR_5cl64zNRhs (accessed Aug 16, 2026)
- [2] sutterhealth.org, https://www.sutterhealth.org/services/acute-inpatient-rehabilitation (accessed Sep 18, 2026)
- [3] sutterhealth.org, https://www.sutterhealth.org/services/adult-congenital-heart-disease (accessed Sep 18, 2026)
- [4] sutterhealth.org, https://www.sutterhealth.org/services/amyotrophic-lateral-sclerosis-als (accessed Sep 18, 2026)
- [5] sutterhealth.org, https://www.sutterhealth.org/services/anesthesia (accessed Sep 18, 2026)
- [6] sutterhealth.org, https://www.sutterhealth.org/services/animal-assisted-therapy (accessed Sep 18, 2026)
- [7] sutterhealth.org, https://www.sutterhealth.org/services/audiology (accessed Sep 18, 2026)
- [8] sutterhealth.org, https://www.sutterhealth.org/services/autism (accessed Sep 18, 2026)
- [9] sutterhealth.org, https://www.sutterhealth.org/services/back-spine-surgery (accessed Sep 18, 2026)
- [10] sutterhealth.org, https://www.sutterhealth.org/services/bariatric-surgery (accessed Sep 18, 2026)
- [11] sutterhealth.org, https://www.sutterhealth.org/services/behavioral-health-care (accessed Sep 18, 2026)
- [12] sutterhealth.org, https://www.sutterhealth.org/services/behavioral-health-outpatient (accessed Sep 18, 2026)
- [13] sutterhealth.org, https://www.sutterhealth.org/services/blood-stem-cell-transplant (accessed Sep 18, 2026)
- [14] sutterhealth.org, https://www.sutterhealth.org/services/brain-injury-rehabilitation (accessed Sep 18, 2026)
- [15] sutterhealth.org, https://www.sutterhealth.org/services/breast-cancer (accessed Sep 18, 2026)
- [16] sutterhealth.org, https://www.sutterhealth.org/services/breast-health (accessed Sep 18, 2026)
- [17] sutterhealth.org, https://www.sutterhealth.org/services/breast-imaging (accessed Sep 18, 2026)
- [18] sutterhealth.org, https://www.sutterhealth.org/services/breast-reshaping (accessed Sep 18, 2026)
- [19] sutterhealth.org, https://www.sutterhealth.org/services/cancer-case-conference (accessed Sep 18, 2026)
- [20] sutterhealth.org, https://www.sutterhealth.org/services/cancer-pain-management (accessed Sep 18, 2026)
- [21] sutterhealth.org, https://www.sutterhealth.org/services/cancer-patient-navigators (accessed Sep 18, 2026)
- [22] sutterhealth.org, https://www.sutterhealth.org/services/cancer-rehabilitation (accessed Sep 18, 2026)
- [23] sutterhealth.org, https://www.sutterhealth.org/services/cardiac-rehabilitation (accessed Sep 18, 2026)
- [24] sutterhealth.org, https://www.sutterhealth.org/services/cardiovascular-imaging-diagnostic (accessed Sep 18, 2026)
- [25] sutterhealth.org, https://www.sutterhealth.org/services/cardiovascular-surgery (accessed Sep 18, 2026)
- [26] sutterhealth.org, https://www.sutterhealth.org/services/child-adolescent-behavioral-health (accessed Sep 18, 2026)
- [27] sutterhealth.org, https://www.sutterhealth.org/services/child-life-program (accessed Sep 18, 2026)
- [28] sutterhealth.org, https://www.sutterhealth.org/services/chronic-kidney-disease (accessed Sep 18, 2026)
- [29] sutterhealth.org, https://www.sutterhealth.org/services/colonoscopy (accessed Sep 18, 2026)
- [30] sutterhealth.org, https://www.sutterhealth.org/services/colorectal-cancer (accessed Sep 18, 2026)
- [31] sutterhealth.org, https://www.sutterhealth.org/services/pediatric-grief-support (accessed Sep 18, 2026)
- [32] sutterhealth.org, https://www.sutterhealth.org/find-provider/dr-tan-m-nguyen-1046242838 (accessed Oct 22, 2026)