David Jonathan Segar, M.D.
Neurological Surgery Physician · San Francisco, CA
David Jonathan Segar, M.D. is a neurological surgery physician with a practice address in San Francisco, California, and NPI 1356703680, issued on Mar 25, 2016. Check the license (California A185505, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Jonathan Segar
- Credential
- M.D.
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License number
- A185505 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave # A811, San Francisco, CA 94143
- Phone
- (415) 353-7500
- Enumerated
- Mar 25, 2016
- Record last updated
- Oct 31, 2023
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
Also registered at 400 Parnassus Ave # A811
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Iahn Cajigas, M.D, PH.D.Neurological Surgery Physician1053730036
- Alexander Suarez, MDNeurological Surgery Physician1083110290
Verify David Jonathan Segar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A185505Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $23.92
1 payment: food and beverage; the largest payer was Medtronic, 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.
David Jonathan Segar among 929 neurological surgery physician records in California
David Jonathan Segar, M.D. 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 2016, is newer than 85% of them.
- NPI issued2016 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2023 · 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 David Jonathan Segar, M.D.'s NPI number?
David Jonathan Segar, M.D.'s National Provider Identifier (NPI) is 1356703680, issued on Mar 25, 2016. An NPI identifies a provider in billing; it is not a license.
Where is David Jonathan Segar, M.D. located?
The NPPES record lists a practice address at 400 Parnassus Ave # A811, San Francisco, CA, 94143. Phone: (415) 353-7500. Providers update this record themselves, so call before visiting.
How can I verify David Jonathan Segar, M.D.'s license?
NPPES lists California license number A185505, 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.
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.