Derek Southwell, MD, PHD
Neurological Surgery Physician · San Francisco, CA
Derek Southwell, MD, PHD is a neurological surgery physician with a practice address in San Francisco, California, and NPI 1316236912, issued on Apr 4, 2011. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Derek Southwell
- Credential
- MD, PHD
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- M14301 ID
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave RM M779, San Francisco, CA 94143
- Phone
- (415) 353-3904
- Enumerated
- Apr 4, 2011
- Record last updated
- Aug 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190117000995); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
Also registered at 505 Parnassus Ave RM M779
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jia-Shu Chen, MDStudent in an Organized Health Care Education/Training Program1124877337
- Jason Chung, MD, PHDStudent in an Organized Health Care Education/Training Program1518581958
- Mahmoud Elguindy, MD, PHDStudent in an Organized Health Care Education/Training Program1609561166
- Anthony LeeNeurological Surgery Physician1043873268
- Robert OsorioStudent in an Organized Health Care Education/Training Program1548015456
- Phiroz Tarapore, M.D.Neurological Surgery Physician1881921104
Verify Derek Southwell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average neurological surgery physician in 2024
20 Medicare Part D claims for 14 beneficiaries, against an average of 172 among the 4,378 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 15 claims were for opioids.
Most prescribed
- Oxycodone Hcl14 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: $593.18
5 payments; by number, the most common kind was food and beverage; the largest payer was Neuropace, Inc. The 5,377 providers of this specialty with any payment received $14,925.58 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.
Bills Medicare through one group practice
- Duke Health Integrated Practice IncDurham, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Derek Southwell among 929 neurological surgery physician records in California
Derek Southwell, MD, PHD 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 2011, is newer than 68% of them.
- NPI issued2011 · 68% of these records are older, 30% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2011 · median 2005 among the 612 with a school on file
- Record last updated2018 · 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 San Francisco → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- Manish Aghi, MD PHDSan Francisco, CA 941431689647778
- Christopher Ames, MDSan Francisco, CA 941431265485155
- Mitchel Berger, MDSan Francisco, CA 941431538117981
- Nicholas Butowski, MDSan Francisco, CA 941431184681009
- Susan Chang, MDSan Francisco, CA 941431346299518
- Nalin Gupta, MDSan Francisco, CA 941431811955438
- Evren Keles, M.D.San Francisco, CA 941431407872674
- Praveen Mummaneni, M.D.San Francisco, CA 941431407960099
Common questions
What is Derek Southwell, MD, PHD's NPI number?
Derek Southwell, MD, PHD's National Provider Identifier (NPI) is 1316236912, issued on Apr 4, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Derek Southwell, MD, PHD located?
The NPPES record lists a practice address at 505 Parnassus Ave RM M779, San Francisco, CA, 94143. Phone: (415) 353-3904. Providers update this record themselves, so call before visiting.
How can I verify Derek Southwell, MD, PHD's license?
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 Derek Southwell, MD, PHD prescribe under Medicare Part D?
In 2024, Derek Southwell, MD, PHD had 20 Medicare Part D claims for 14 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.