Dr. Brian Martin Sebastian, MD
- Medicare services, 2024
- 3,562
- Medicare patients, 2024
- 590
- Part D claims, 2024
- 9,091
- MIPS score, 2024
- 81
- Hospital affiliations
- 4
- Practice address
- 651 1st St W, Sonoma, CA 95476-7045
- Practice phone
- Call (707) 938-3870
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Prima Medical Foundation
Multi-specialty group site · Sonoma, California
Find Dr. Sebastian's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Brian Martin Sebastian is an internist in Sonoma, California
Dr. Sebastian practices at Prima Medical Foundation in Sonoma, California.
Dr. Sebastian's NPI, 1184624637, was assigned on July 27, 2005. Dr. Sebastian graduated from Duke University School Of Medicine in 1997. Dr. Sebastian's California license number on file is A92199.
- NPI
- 1184624637NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991602906
- NPI enumeration date
- July 27, 2005
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (707) 938-3870
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Brian Martin Sebastian practices at Prima Medical Foundation in Sonoma, California
Dr. Sebastian's primary practice is Prima Medical Foundation, at 651 1st St W, Sonoma, CA 95476-7045. The practice phone is (707) 938-3870.
- Prima Medical Foundation651 1st St W, Sonoma, CA 95476-7045Phone(707) 938-3870
Source: Dmand AI Affiliation Data
Dr. Brian Martin Sebastian is affiliated with 12 sites of care and 3 medical groups
Dr. Sebastian's primary practice is Prima Medical Foundation in Sonoma, California. Dr. Sebastian is also affiliated with Sonoma Valley Hospital. The medical group on file is UCSF Medical Group. Dmand AI also links Dr. Sebastian to 3 more hospitals, 5 home health agencies, 2 group practices and clinics and 2 medical groups, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Brian Martin Sebastian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sebastian practices, 12 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Prima Medical Foundation | Available with a free account |
| +11 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Brian Martin Sebastian is one of 16,751 internists in California
Internal medicine is Dr. Sebastian's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Sebastian is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Sebastian's licenses on file in 5 states: California, District of Columbia, Virginia, Maryland and West Virginia.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- District of Columbia license
- Virginia license
- Maryland license
- West Virginia license
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, acute skin infection, alcohol use disorders, alzheimer's disease, aneurysm, anxiety and aortic atherosclerois among the conditions Dr. Sebastian treats.
Internists near Dr. Sebastian
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Brian Martin Sebastian billed Medicare for 3,562 services in 2024
CMS data shows 3,562 Medicare services from Dr. Sebastian across 22 procedure codes in 2024, for 590 Medicare patients. Medicare paid $251,723 for them. Every service was in an office.
Dr. Sebastian's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,6082024: 1,5692%
- Other services
- 2023: 5612024: 98375%
- Tests and treatments
- 2023: 3962024: 803103%
- Lab and pathology
- 2023: 2692024: 18830%
- Surgery
- 2023: 282024: 1932%
Dr. Sebastian compared with the California median for internists, 2024
- Dr. Sebastian
- California median
- Medicare services
- 3,562vs 3619.9 times
- Medicare patients
- 590vs 1513.9 times
- Part D claims
- 8,288vs 42119.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Sebastian's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Sebastian and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Brian Martin Sebastian treated 590 Medicare patients in 2024, average age 77
CMS counts 590 Medicare patients who saw Dr. Sebastian in 2024. The largest group is 75 to 84, with 257 patients. 75% of them have high cholesterol, and 62% have high blood pressure. 2% are also on Medicaid. Their average risk score is 1.12, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Sebastian's median patient age at 76, with 49% women.
Dr. Sebastian's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Sebastian's Medicare patients by sex, 2024
- Women27647%
- Men31453%
Chronic conditions among Dr. Sebastian's Medicare patients, 2024
- High cholesterol75%
- High blood pressure62%
- Arthritis37%
- Ischemic heart disease25%
- Chronic kidney disease24%
- Mood disorders23%
- Atrial fibrillation20%
- Depression19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sebastian's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Brian Martin Sebastian wrote 9,091 Medicare Part D claims in 2024
In 2024, Dr. Sebastian wrote 9,091 Medicare Part D claims for 911 patients. 86% of them were for generic drugs. CMS names the drug for 8,288 of them, across 140 drugs with 11 or more claims each, at $917,381 in total drug cost. In 2023, CMS named 7,116 claims across 127 drugs.
Dr. Sebastian's Part D claims by kind of drug, 2024
- Generic7,852 claims86%
- Brand-name1,223 claims13%
- Other16 claims0%
Dr. Sebastian's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Sebastian's Part D claims, 2024
- Opioids2%191 of 9,091 claims
- Antibiotics2%198 of 9,091 claims
- Antipsychotics, patients 65 and over1%49 of 9,091 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 7,1162024: 8,28816%
Drugs named by CMS: 140 in 2024, 127 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Brian Martin Sebastian scored 81 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 81 out of 100 for Dr. Sebastian for performance year 2024. CMS lists Dr. Sebastian as offering telehealth. CMS counts 22 procedures of removal of skin lesions by Dr. Sebastian, more than 66% of the clinicians it reports for that procedure.
- Offers telehealth
- Yes
Dr. Sebastian's MIPS scores, performance year 2024
- 81of 100Final score
- 80.9of 100Quality
- 76of 100Promoting Interoperability
- 40of 100Improvement Activities
- 76of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Sebastian ranks in Medicare procedure volume
- Removal of skin lesions
- 66th percentile22 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Brian Martin Sebastian received $410 in industry payments from 2016 to 2024
CMS Open Payments shows 10 general payments to Dr. Sebastian from 6 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 62% of the total. Sanofi Pasteur Inc. paid the most, $154.
General payments to Dr. Sebastian by program year, 2016 to 2024
General payments to Dr. Sebastian by kind, 2016 to 2024
- Food and beverage$25662%
- Speaker and faculty fees$15438%
Companies that paid Dr. Sebastian the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Brian Martin Sebastian graduated from Duke University School Of Medicine
Dr. Sebastian graduated from Duke University School Of Medicine in 1997.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Brian Martin Sebastian accepts plans from 10 insurance carriers
Dr. Sebastian is in network with 10 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- +2 more carriersWith a free account
Plan types Dr. Sebastian accepts, by number of carriers
- Medicare8
- PPO8
- HMO4
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Brian Martin Sebastian's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Brian Martin Sebastian
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Brian Martin Sebastian's NPI number?
Dr. Brian Martin Sebastian's NPI number is 1184624637. It was assigned on July 27, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Brian Martin Sebastian?
Dr. Brian Martin Sebastian is an internist in Sonoma, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Brian Martin Sebastian practice?
Dr. Sebastian practices at 651 1st St W, Sonoma, CA 95476-7045. Dr. Sebastian's primary practice is Prima Medical Foundation in Sonoma, California. Dmand AI also links Dr. Sebastian to 3 hospitals, 5 home health agencies, 2 group practices and clinics and 2 medical groups.
What is Dr. Brian Martin Sebastian's office phone number?
The practice phone on file for Dr. Sebastian is (707) 938-3870.
What is Dr. Brian Martin Sebastian's medical license number?
Dr. Sebastian's California license number on file is A92199, one of the licenses on file in 5 states.
Which states has Dr. Brian Martin Sebastian been licensed in?
Dmand AI has state licenses on file for Dr. Sebastian in California (2005 to 2025), District of Columbia (1999 to 2006), Virginia (1997 to 2006), Maryland (2005) and West Virginia (2000 to 2005).
Which hospitals is Dr. Brian Martin Sebastian affiliated with?
Dr. Sebastian is affiliated with Sonoma Valley Hospital. Dmand AI links Dr. Sebastian to 3 more hospitals.
What medical group is Dr. Brian Martin Sebastian part of?
Dr. Sebastian is linked to UCSF Medical Group. Dmand AI links Dr. Sebastian to 2 more medical groups.
Does Dr. Brian Martin Sebastian accept Medicare?
Yes. CMS data shows Dr. Sebastian billed Medicare for 3,562 services in 2024.
Does Dr. Brian Martin Sebastian offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Sebastian as offering telehealth services.
Show 9 more questionsShow fewer questions
What is Dr. Brian Martin Sebastian's MIPS score?
Dr. Sebastian's MIPS final score for performance year 2024 is 81 out of 100.
How many Medicare patients does Dr. Brian Martin Sebastian see?
CMS counts 590 Medicare patients who saw Dr. Sebastian in 2024, with an average age of 77.
Is Dr. Brian Martin Sebastian board certified?
Yes. Dr. Sebastian is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Brian Martin Sebastian bill to Medicare?
In 2024, Dr. Sebastian's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and medicare service (G0439).
Where did Dr. Brian Martin Sebastian go to medical school?
Dr. Sebastian graduated from Duke University School Of Medicine in 1997.
What drugs does Dr. Brian Martin Sebastian prescribe most?
In 2024 Medicare Part D data, Dr. Sebastian's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Brian Martin Sebastian received payments from drug or device companies?
CMS Open Payments shows $410 in general payments to Dr. Sebastian from 6 companies from 2016 to 2024. The largest total came from Sanofi Pasteur Inc.
How long has Dr. Brian Martin Sebastian been practicing?
Dr. Sebastian graduated from medical school in 1997, 29 years ago.
What insurance does Dr. Brian Martin Sebastian accept?
Dr. Sebastian is in network with 10 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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