Christopher A. Simmons, M.D.
Internal Medicine Physician · Lafayette, CA
Christopher A. Simmons, M.D. is an internal medicine physician with a practice address in Lafayette, California, and NPI 1083630081, issued on Jul 14, 2006. Check the license (California A52899, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christopher A. Simmons
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A52899 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3466 Mt Diablo Blvd, Lafayette, CA 94549
- Phone
- (925) 284-4442
- Enumerated
- Jul 14, 2006
- Record last updated
- Jun 21, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (925) 283-8687
- Medicaid ID
- 00A528990 CA
- Medicare enrollment
- Enrolled (PECOS I20040319000988); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3466 Mt Diablo Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Maha Toma, M.D.Internal Medicine Physician1427108125
- Herbert Ure, M.D.Family Medicine Physician1144248402
Verify Christopher A. Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A52899Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% more Medicare Part D claims than the average internal medicine physician in 2024
5,647 Medicare Part D claims for 312 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 71 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium444 claims
- Levothyroxine Sodium252 claims
- Amlodipine Besylate217 claims
- Eliquis174 claims
- Atorvastatin Calcium136 claims
- Metoprolol Succinate134 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $14.09
1 payment: food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Christopher A. Simmons among 17,696 internal medicine physician records in California
Christopher A. Simmons, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1991 · median 2004 among the 11,065 with a school on file
- Record last updated2012 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 internal medicine physician records list a practice address in Lafayette
They are 6 of the 736 NPPES records with a practice address in Lafayette, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Lafayette → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Aimee Keyashian, MDLafayette, CA 945491578806329
- Vona Wright Lorenzana, M.D.Lafayette, CA 945491992752661
- Leonard Saputo, MDLafayette, CA 945491295825438
- Roland Schoen, MDLafayette, CA 945491811260185
- Maha Toma, M.D.Lafayette, CA 945491427108125
- Michael Alper, M.D.Livermore, CA 945501801880505
- Nader Kaldas, M.D.Livermore, CA 945501760492391
- Samata Kanagala, M.DLivermore, CA 945501710902499
Common questions
What is Christopher A. Simmons, M.D.'s NPI number?
Christopher A. Simmons, M.D.'s National Provider Identifier (NPI) is 1083630081, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher A. Simmons, M.D. located?
The NPPES record lists a practice address at 3466 Mt Diablo Blvd, Lafayette, CA, 94549. Phone: (925) 284-4442. Providers update this record themselves, so call before visiting.
How can I verify Christopher A. Simmons, M.D.'s license?
NPPES lists California license number A52899, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christopher A. Simmons, M.D. prescribe under Medicare Part D?
In 2024, Christopher A. Simmons, M.D. had 5,647 Medicare Part D claims for 312 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.