Dr. Aaron C. Williams, MD
- Part D claims, 2024
- 5,324
- Hospital affiliations
- 1
- Medical group
- 1
- Insurance carriers
- 2
- State license
- 1
- Practice address
- 700 Lawrence Expressway, Santa Clara, CA 95051
- Practice phone
- Call (408) 236-6400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Williams' 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. Aaron C. Williams is an internist in Santa Clara, California
Dr. Williams practices at Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente.
Dr. Williams' NPI, 1982783627, was assigned on November 3, 2006. Dr. Williams graduated from UC Davis School of Medicine in 2000. Dr. Williams holds California license A76508.
- NPI
- 1982783627NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0648171736
- NPI enumeration date
- November 3, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (408) 236-6400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Aaron C. Williams practices at Santa Clara Medical Center in Santa Clara, California
Dr. Williams' primary practice is Santa Clara Medical Center, at 700 Lawrence Expressway, Santa Clara, CA 95051 in Santa Clara County. The practice phone is (408) 236-6400.
- Santa Clara Medical Center700 Lawrence Expressway, Santa Clara, CA 95051 · Santa Clara CountyPhone(408) 236-6400
Source: Dmand AI Affiliation Data
Dr. Aaron C. Williams is affiliated with 3 sites of care and 1 medical group
Dr. Williams' primary practice is Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Williams to 1 more group practice or clinic and 1 hospice, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Aaron C. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Santa Clara Medical Center | 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. Aaron C. Williams is one of 16,751 internists in California
Internal medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Williams is board certified in internal medicine by the American Board of Internal Medicine. Dr. Williams is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists contact dermatitis among the conditions Dr. Williams treats.
Internists near Dr. Williams
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. Aaron C. Williams' patients have a median age of 65
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 65, with 28% women.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women28%
- Men72%
Source: Dmand AI Patient Panel Data
Dr. Aaron C. Williams wrote 5,324 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 5,324 Medicare Part D claims for 435 patients. 90% of them were for generic drugs. CMS names the drug for 4,838 of them, across 85 drugs with 11 or more claims each, at $234,402 in total drug cost.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic4,767 claims90%
- Brand-name519 claims10%
- Other38 claims1%
Dr. Williams' 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. Williams' Part D claims, 2024
- Opioids2%86 of 5,324 claims
- Antibiotics2%101 of 5,324 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
How Dr. Aaron C. Williams takes part in Medicare
Dr. Williams 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. Aaron C. Williams has 1 award and honors on record
Dmand AI lists 1 award for Dr. Williams, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Williams
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Aaron C. Williams graduated from UC Davis School of Medicine
Dr. Williams graduated from UC Davis School of Medicine in 2000.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Aaron C. Williams accepts plans from 2 insurance carriers
Dr. Williams 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. Williams accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Aaron C. Williams'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Aaron C. Williams
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. Aaron C. Williams' NPI number?
Dr. Aaron C. Williams' NPI number is 1982783627. It was assigned on November 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Aaron C. Williams?
Dr. Aaron C. Williams is an internist in Santa Clara, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Aaron C. Williams practice?
Dr. Williams practices at 700 Lawrence Expressway, Santa Clara, CA 95051. Dr. Williams' primary practice is Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente. Dmand AI also links Dr. Williams to 1 group practice or clinic and 1 hospice.
What is Dr. Aaron C. Williams' office phone number?
The practice phone on file for Dr. Williams is (408) 236-6400.
What is Dr. Aaron C. Williams' medical license number?
Dr. Williams holds California license A76508.
Which hospitals is Dr. Aaron C. Williams affiliated with?
Dr. Williams practices at Santa Clara Medical Center in Santa Clara, California.
What medical group is Dr. Aaron C. Williams part of?
Dr. Williams is linked to The Permanente Medical Group, Inc.
Does Dr. Aaron C. Williams accept Medicare?
Yes. CMS lists Dr. Williams as accepting Medicare assignment.
Is Dr. Aaron C. Williams board certified?
Yes. Dr. Williams is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. Aaron C. Williams go to medical school?
Dr. Williams graduated from UC Davis School of Medicine in 2000.
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What drugs does Dr. Aaron C. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
How long has Dr. Aaron C. Williams been practicing?
Dr. Williams graduated from medical school in 2000, 26 years ago.
What insurance does Dr. Aaron C. Williams accept?
Dr. Williams 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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