Brian Martin Sebastian, MD
Internal Medicine Physician · Sonoma, CA
Brian Martin Sebastian, MD is an internal medicine physician with a practice address in Sonoma, California, and NPI 1184624637, issued on Jul 27, 2005. Check the license (California A92199, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian Martin Sebastian
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A92199 CA
Self-reported in NPPES; status is on the state search - Practice location
- 651 1St St W, Sonoma, CA 95476
- Phone
- (707) 938-3870
- Enumerated
- Jul 27, 2005
- Record last updated
- Feb 7, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050901000435); may accept Medicare assignment
- Medical or professional school
- Duke University School Of Medicine, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 651 1St St W
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Brian Martin Sebastian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A92199Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average internal medicine physician in 2024
9,091 Medicare Part D claims for 911 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 191 claims were for opioids.
Most prescribed
- Atorvastatin Calcium618 claims
- Amlodipine Besylate341 claims
- Losartan Potassium281 claims
- Levothyroxine Sodium262 claims
- Rosuvastatin Calcium259 claims
- Gabapentin237 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: $15.17
1 payment: food and beverage; the largest payer was Pfizer 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.
Bills Medicare through one group practice
- Regents Univ OF California UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
12 internal medicine physician records list a practice address in Sonoma
They are 12 of the 395 NPPES records with a practice address in Sonoma, and 17,696 internal medicine physician records in California.
All 12 in Sonoma → All 17,696 in California → Every provider in Sonoma →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Brian Martin Sebastian, MD's NPI number?
Brian Martin Sebastian, MD's National Provider Identifier (NPI) is 1184624637, issued on Jul 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Brian Martin Sebastian, MD located?
The NPPES record lists a practice address at 651 1St St W, Sonoma, CA, 95476. Phone: (707) 938-3870. Providers update this record themselves, so call before visiting.
How can I verify Brian Martin Sebastian, MD's license?
NPPES lists California license number A92199, 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 Brian Martin Sebastian, MD prescribe under Medicare Part D?
In 2024, Brian Martin Sebastian, MD had 9,091 Medicare Part D claims for 911 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.