Dr. James A. Siy, MD
- Medicare patients, 2024
- 14
- Part D claims, 2024
- 8,061
- Hospital affiliations
- 1
- 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. Siy'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. James A. Siy is an internist in Stockton, California
Dr. Siy practices at Permanente Medical Group Inc in Stockton, California.
Dr. Siy's NPI, 1811075591, was assigned on November 1, 2006. Dr. Siy graduated from University of Wisconsin School of Medicine and Public Health in 1992. Dr. Siy holds California license G87559.
- NPI
- 1811075591NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698747764
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (209) 476-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James A. Siy practices at Permanente Medical Group Inc in Stockton, California
Dr. Siy'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. James A. Siy is affiliated with 3 sites of care and 1 medical group
Dr. Siy's primary practice is Permanente Medical Group Inc in Stockton, California. Dr. Siy is also affiliated with Roseville Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Siy 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 Dr. James A. Siy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Siy 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
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. James A. Siy is one of 16,751 internists in California
Internal medicine is Dr. Siy's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Siy is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Siy's licenses on file in 3 states: California, Wisconsin and Minnesota.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Wisconsin license
- Minnesota license
Clinical focus
Dmand AI lists chronic diabetes, chronic hypertension and erectile dysfunction among the conditions Dr. Siy treats.
Internists near Dr. Siy
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. James A. Siy treated 14 Medicare patients in 2024, average age 68
CMS counts 14 Medicare patients who saw Dr. Siy in 2024. The largest group is 85 and over, with 0 patients. Their average risk score is 0.78, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Siy's median patient age at 55, with 54% women.
Dr. Siy's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Siy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James A. Siy wrote 8,061 Medicare Part D claims in 2024
In 2024, Dr. Siy wrote 8,061 Medicare Part D claims for 936 patients. 91% of them were for generic drugs. CMS names the drug for 7,544 of them, across 134 drugs with 11 or more claims each, at $269,566 in total drug cost. In 2023, CMS named 7,108 claims across 120 drugs.
Dr. Siy's Part D claims by kind of drug, 2024
- Generic7,346 claims91%
- Brand-name683 claims8%
- Other32 claims0%
Dr. Siy'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. Siy's Part D claims, 2024
- Opioids8%620 of 8,061 claims
- Antibiotics5%434 of 8,061 claims
- Antipsychotics, patients 65 and over0%13 of 8,061 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: 7,1082024: 7,5446%
Drugs named by CMS: 134 in 2024, 120 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
Dr. James A. Siy offers telehealth to Medicare patients
Dr. Siy accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Siy as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. James A. Siy graduated from University of Wisconsin School of Medicine and Public Health
Dr. Siy graduated from University of Wisconsin School of Medicine and Public Health in 1992.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. James A. Siy accepts plans from 2 insurance carriers
Dr. Siy 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. Siy accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. James A. Siy'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 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) |
| 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. James A. Siy
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. James A. Siy's NPI number?
Dr. James A. Siy's NPI number is 1811075591. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. James A. Siy?
Dr. James A. Siy is an internist in Stockton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. James A. Siy practice?
Dr. Siy practices at 7373 West Ln, Stockton, CA 95210. Dr. Siy's primary practice is Permanente Medical Group Inc in Stockton, California. Dmand AI also links Dr. Siy to 1 group practice or clinic.
What is Dr. James A. Siy's office phone number?
The practice phone on file for Dr. Siy is (209) 476-2000.
What is Dr. James A. Siy's medical license number?
Dr. Siy holds California license G87559, one of the licenses on file in 3 states.
Which states has Dr. James A. Siy been licensed in?
Dmand AI has state licenses on file for Dr. Siy in California (2005 to 2027), Wisconsin (1995 to 2007) and Minnesota (1993 to 1995).
Which hospitals is Dr. James A. Siy affiliated with?
Dr. Siy is affiliated with Roseville Medical Center.
What medical group is Dr. James A. Siy part of?
Dr. Siy is linked to The Permanente Medical Group, Inc.
Does Dr. James A. Siy accept Medicare?
Yes. CMS lists Dr. Siy as accepting Medicare assignment.
Does Dr. James A. Siy offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Siy as offering telehealth services.
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. James A. Siy see?
CMS counts 14 Medicare patients who saw Dr. Siy in 2024, with an average age of 68.
Is Dr. James A. Siy board certified?
Yes. Dr. Siy is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. James A. Siy go to medical school?
Dr. Siy graduated from University of Wisconsin School of Medicine and Public Health in 1992.
What drugs does Dr. James A. Siy prescribe most?
In 2024 Medicare Part D data, Dr. Siy's most prescribed drugs by claims were Atorvastatin Calcium, Hydrocodone-Acetaminophen and Amlodipine Besylate.
How long has Dr. James A. Siy been practicing?
Dr. Siy graduated from medical school in 1992, 34 years ago.
What insurance does Dr. James A. Siy accept?
Dr. Siy 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.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card