Allen D. Efron, MD
Neurological Surgery Physician · Redwood City, CA
Allen D. Efron, MD is a neurological surgery physician with a practice address in Redwood City, California, and NPI 1831277482, issued on Nov 1, 2006. Check the license (California G66809, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allen D. Efron
- Credential
- MD
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- G66809 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1150 Veterans Blvd, Redwood City, CA 94063
- Phone
- (650) 299-2000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G668090 CA
- Medicare enrollment
- Enrolled (PECOS I20220517002051); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 1988
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
Also registered at 1150 Veterans Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Anil Assudani, M.D,Psychiatry Physician1497753909
- Everett Austin, MDNeurology Physician1083792642
- Lauren Bacon, DPTPhysical Therapist1295167583
Verify Allen D. Efron in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G66809Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average neurological surgery physician in 2024
57 Medicare Part D claims for 33 beneficiaries, against an average of 172 among the 4,378 providers of this specialty who prescribed in Part D. 37 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen29 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.
Bills Medicare through one group practice
- Hawaii Permanente Medical Group IncHonolulu, HI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allen D. Efron among 929 neurological surgery physician records in California
Allen D. Efron, MD is one of 929 neurological surgery physician records with a practice address in California. 77% 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, 62% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1988 · median 2005 among the 612 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurological Surgery Physician providers in California
There are 929 neurological surgery physician records in California.
All 929 in California → Every provider in Redwood City → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- Cecil Jun, MDRedwood City, CA 940631790863389
- Alexander Kleider, MDRedwood City, CA 940631659459204
- Jay Nathan, MDRedwood City, CA 940631962843946
- Tina Nguyen, M.D.Redwood City, CA 940631033381553
- Stephen Nutik, MDRedwood City, CA 940631841378486
- Scott Peak, MDRedwood City, CA 940631326066671
- Arjun Pendharkar, MDRedwood City, CA 940631992142384
- Adhikari Reddy, MDRedwood City, CA 940631154478030
Common questions
What is Allen D. Efron, MD's NPI number?
Allen D. Efron, MD's National Provider Identifier (NPI) is 1831277482, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Allen D. Efron, MD located?
The NPPES record lists a practice address at 1150 Veterans Blvd, Redwood City, CA, 94063. Phone: (650) 299-2000. Providers update this record themselves, so call before visiting.
How can I verify Allen D. Efron, MD's license?
NPPES lists California license number G66809, 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 Allen D. Efron, MD prescribe under Medicare Part D?
In 2024, Allen D. Efron, MD had 57 Medicare Part D claims for 33 beneficiaries; the average among neurological surgery physician prescribers was 172. 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.