Dr. Stephen Chen, MD
- Part D claims, 2024
- 966
- Hospital affiliations
- 1
- Industry payments
- $329
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 7373 West Ln, Stockton, CA 95210
- Practice phone
- Call (209) 476-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Permanente Medical Group Inc
Stockton, California
Find Dr. Chen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Stephen Chen is an internist in Stockton, California
Dr. Chen practices at Permanente Medical Group Inc in Stockton, California.
Dr. Chen's NPI, 1265601553, was assigned on February 21, 2008. Dr. Chen graduated from St. George's University School of Medicine in 2005. Dr. Chen's California license number on file is A102205.
- NPI
- 1265601553NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3678631017
- NPI enumeration date
- February 21, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 476-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stephen Chen practices at Permanente Medical Group Inc in Stockton, California
Dr. Chen's primary practice is Permanente Medical Group Inc, at 7373 West Ln, Stockton, CA 95210 in San Joaquin County. The practice phone is (209) 476-2000.
- Permanente Medical Group Inc7373 West Ln, Stockton, CA 95210 · San Joaquin CountyPhone(209) 476-2000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Stephen Chen is affiliated with 3 sites of care and 1 medical group
Dr. Chen's primary practice is Permanente Medical Group Inc in Stockton, California. Dr. Chen is also affiliated with Manteca Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Chen to 1 more hospice, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stephen Chen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Permanente Medical Group Inc | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Stephen Chen is one of 16,751 internists in California
Internal medicine is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chen is board certified in hospice and palliative medicine by the American Board of Internal Medicine. Dr. Chen has a license on file in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Chen
Counts of internists 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
Dr. Stephen Chen's patients have a median age of 48
Across all payers, Dmand AI patient panel data puts Dr. Chen's median patient age at 48, with 60% women.
Dr. Chen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women60%
- Men39%
Source: Dmand AI Patient Panel Data
Dr. Stephen Chen wrote 966 Medicare Part D claims in 2024
In 2024, Dr. Chen wrote 966 Medicare Part D claims for 190 patients. 85% of them were for generic drugs. CMS names the drug for 769 of them, across 18 drugs with 11 or more claims each, at $108,481 in total drug cost. In 2023, CMS named 479 claims across 14 drugs.
Dr. Chen's Part D claims by kind of drug, 2024
- Generic824 claims85%
- Brand-name142 claims15%
Dr. Chen'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 Dr. Chen's Part D claims, 2024
- Opioids47%458 of 966 claims
- Antipsychotics, patients 65 and over2%21 of 966 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4792024: 76961%
Drugs named by CMS: 18 in 2024, 14 in 2023.
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
How Dr. Stephen Chen takes part in Medicare
Dr. Chen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Stephen Chen received $329 in industry payments from 2018 to 2025
CMS Open Payments shows 5 general payments to Dr. Chen from 5 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 100% of the total. Bristol-Myers Squibb Company paid the most, $125.
General payments to Dr. Chen by program year, 2018 to 2025
Companies that paid Dr. Chen the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stephen Chen graduated from St. George's University School of Medicine
Dr. Chen graduated from St. George's University School of Medicine in 2005.
- Medical school
- Board certified in hospice and palliative medicine
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Stephen Chen accepts plans from 2 insurance carriers
Dr. Chen is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Chen accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Stephen Chen'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 DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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 Dr. Stephen Chen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stephen Chen's NPI number?
Dr. Stephen Chen's NPI number is 1265601553. It was assigned on February 21, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen Chen?
Dr. Stephen Chen is an internist in Stockton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Stephen Chen practice?
Dr. Chen practices at 7373 West Ln, Stockton, CA 95210. Dr. Chen's primary practice is Permanente Medical Group Inc in Stockton, California. Dmand AI also links Dr. Chen to 1 hospice.
What is Dr. Stephen Chen's office phone number?
The practice phone on file for Dr. Chen is (209) 476-2000.
What is Dr. Stephen Chen's medical license number?
Dr. Chen's California license number on file is A102205.
Which hospitals is Dr. Stephen Chen affiliated with?
Dr. Chen is affiliated with Manteca Medical Center.
What medical group is Dr. Stephen Chen part of?
Dr. Chen is linked to The Permanente Medical Group, Inc.
Does Dr. Stephen Chen accept Medicare?
Yes. CMS lists Dr. Chen as accepting Medicare assignment.
Is Dr. Stephen Chen board certified?
Yes. Dr. Chen is board certified in hospice and palliative medicine by the American Board of Internal Medicine.
Where did Dr. Stephen Chen go to medical school?
Dr. Chen graduated from St. George's University School of Medicine in 2005.
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What drugs does Dr. Stephen Chen prescribe most?
In 2024 Medicare Part D data, Dr. Chen's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Oxycontin and Dexamethasone.
Has Dr. Stephen Chen received payments from drug or device companies?
CMS Open Payments shows $329 in general payments to Dr. Chen from 5 companies from 2018 to 2025. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Stephen Chen been practicing?
Dr. Chen graduated from medical school in 2005, 21 years ago.
What insurance does Dr. Stephen Chen accept?
Dr. Chen is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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