John Nguyen, PA-C
- Medicare services, 2024
- 154
- Medicare patients, 2024
- 37
- Part D claims, 2024
- 790
- Industry payments
- $4,588
- Affiliated sites
- 1
- Practice address
- 500 Chadbourne Rd, Fairfield, CA 94534
- Practice phone
- Call (707) 439-4039
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
North American Mental Health Services
Fairfield, California
Find John Nguyen's professional email, personal email and mobile number
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John Nguyen is a physician assistant in Fairfield, California
John Nguyen practices at North American Mental Health Services in Fairfield, California.
John Nguyen's NPI, 1558924803, was assigned on April 22, 2019. John Nguyen holds California license 57004.
- NPI
- 1558924803NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1153659412
- NPI enumeration date
- April 22, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (707) 439-4039
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
John Nguyen practices at North American Mental Health Services in Fairfield, California
John Nguyen's primary practice is North American Mental Health Services, at 500 Chadbourne Rd, Fairfield, CA 94534 in Solano County. The practice phone is (707) 439-4039.
- North American Mental Health Services500 Chadbourne Rd, Fairfield, CA 94534 · Solano CountyPhone(707) 439-4039
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
John Nguyen is affiliated with 2 sites of care and 1 medical group
John Nguyen's primary practice is North American Mental Health Services in Fairfield, California. The medical group on file is North American Mental Health Services. Dmand AI also links John Nguyen to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John Nguyen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Nguyen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| North American Mental Health Services | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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John Nguyen is one of 11,482 physician assistants in California
Physician assistant is John Nguyen's primary specialty in the NPI Registry, under taxonomy code 363A00000X. John Nguyen is licensed in California.
Specialties and state licenses
- Physician assistant, CaliforniaPrimary
Physician assistants near John Nguyen
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John Nguyen billed Medicare for 154 services in 2024
CMS data shows 154 Medicare services from John Nguyen across 2 procedure codes in 2024, all of them office visits, for 37 Medicare patients. Medicare paid $13,773 for them. Every service was in an office.
John Nguyen compared with the California median for physician assistants, 2024
- John Nguyen
- California median
- Medicare services
- 154vs 20425% below
- Medicare patients
- 37vs 10565% below
- Part D claims
- 665vs 2432.7 times
Medians across 7,065 physician assistants in California with Dmand AI profiles that report each measure.
John Nguyen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
John Nguyen treated 37 Medicare patients in 2024, average age 55
CMS counts 37 Medicare patients who saw John Nguyen in 2024. The largest group is under 65, with 26 patients. 75% of them have mood disorders, and 68% have anxiety. Their average risk score is 1.28, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Nguyen's median patient age at 36, with 47% women.
John Nguyen's Medicare patients by age, 2024
John Nguyen's Medicare patients by sex, 2024
- Women1643%
- Men2157%
Chronic conditions among John Nguyen's Medicare patients, 2024
- Mood disorders75%
- Anxiety68%
- Depression62%
- High cholesterol62%
- High blood pressure57%
- Diabetes41%
- Alcohol and drug use disorders30%
- Bipolar disorder30%
Share of Medicare patients with each condition. A patient can have several.
John Nguyen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 36
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John Nguyen wrote 790 Medicare Part D claims in 2024
In 2024, John Nguyen wrote 790 Medicare Part D claims for 49 patients. 95% of them were for generic drugs. CMS names the drug for 665 of them, across 28 drugs with 11 or more claims each, at $51,615 in total drug cost.
John Nguyen's Part D claims by kind of drug, 2024
- Generic747 claims95%
- Brand-name43 claims5%
John Nguyen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in John Nguyen's Part D claims, 2024
- Antipsychotics, patients 65 and over6%47 of 790 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
John Nguyen offers telehealth to Medicare patients
John Nguyen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists John Nguyen as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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John Nguyen received $4,588 in industry payments from 2024 to 2025
CMS Open Payments shows 149 general payments to John Nguyen from 15 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 95% of the total. Alkermes, Inc. paid the most, $516.
General payments to John Nguyen by program year, 2024 to 2025
General payments to John Nguyen by kind, 2024 to 2025
- Food and beverage$4,37195%
- Education$2175%
Companies that paid John Nguyen the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for John Nguyen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John Nguyen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John Nguyen's NPI number?
John Nguyen's NPI number is 1558924803. It was assigned on April 22, 2019, and it is active in the NPI Registry.
What does John Nguyen specialize in?
John Nguyen is a physician assistant in Fairfield, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does John Nguyen practice?
John Nguyen practices at 500 Chadbourne Rd, Fairfield, CA 94534. John Nguyen's primary practice is North American Mental Health Services in Fairfield, California. Dmand AI also links John Nguyen to 1 group practice or clinic.
What is John Nguyen's office phone number?
The practice phone on file for John Nguyen is (707) 439-4039.
What is John Nguyen's medical license number?
John Nguyen holds California license 57004.
What medical group is John Nguyen part of?
John Nguyen is linked to North American Mental Health Services.
Does John Nguyen accept Medicare?
Yes. CMS data shows John Nguyen billed Medicare for 154 services in 2024, and John Nguyen accepts Medicare assignment.
Does John Nguyen offer telehealth?
Yes. The CMS Doctors and Clinicians file lists John Nguyen as offering telehealth services.
How many Medicare patients does John Nguyen see?
CMS counts 37 Medicare patients who saw John Nguyen in 2024, with an average age of 55.
What services does John Nguyen bill to Medicare?
In 2024, John Nguyen's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99215).
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What drugs does John Nguyen prescribe most?
In 2024 Medicare Part D data, John Nguyen's most prescribed drugs by claims were Venlafaxine HCl ER, Trazodone HCl and Escitalopram Oxalate.
Has John Nguyen received payments from drug or device companies?
CMS Open Payments shows $4,588 in general payments to John Nguyen from 15 companies from 2024 to 2025. The largest total came from Alkermes, Inc.
How long has John Nguyen been practicing?
John Nguyen graduated from medical school in 2019, 7 years ago.
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