Dr. Roderick Negal Seamster, MD
- Medicare services, 2024
- 13
- Medicare patients, 2024
- 21
- Part D claims, 2024
- 89
- Industry payments
- $537
- Affiliated sites
- 2
- Practice address
- 630 Drake Ave, Sausalito, CA 94965
- Practice phone
- Call (415) 339-8813
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Marin City Health and Wellness Dental Van
FQHC - Satellite Clinic · Sausalito, California
Find Dr. Seamster'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. Roderick Negal Seamster is an internist in Sausalito, California
Dr. Seamster practices at Marin City Health and Wellness Dental Van in Sausalito, California.
Dr. Seamster's NPI, 1407951551, was assigned on September 13, 2006. Dr. Seamster graduated from Harvard Medical School in 1987. Dr. Seamster holds California license G64516.
- NPI
- 1407951551NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8729978044
- NPI enumeration date
- September 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 339-8813
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Roderick Negal Seamster practices at Marin City Health and Wellness Dental Van in Sausalito, California
Dr. Seamster's primary practice is Marin City Health and Wellness Dental Van, at 630 Drake Ave, Sausalito, CA 94965 in Marin County. The practice phone is (415) 339-8813.
- Marin City Health and Wellness Dental Van630 Drake Ave, Sausalito, CA 94965 · Marin CountyPhone(415) 339-8813
Source: Dmand AI Affiliation Data
Dr. Roderick Negal Seamster is affiliated with 2 sites of care and 1 medical group
Dr. Seamster's primary practice is Marin City Health and Wellness Dental Van in Sausalito, California. The medical group on file is Marin City Health & Wellness Center. Dmand AI also links Dr. Seamster to 1 more group practice or clinic, named with a free account. Dr. Seamster's employer is on file too: a community health center (fqhc).
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Roderick Negal Seamster's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Seamster practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Marin City Health and Wellness Dental Van | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Roderick Negal Seamster is one of 16,751 internists in California
Internal medicine is Dr. Seamster's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Seamster is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Seamster
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. Roderick Negal Seamster billed Medicare for 13 services in 2024
CMS data shows 13 Medicare services from Dr. Seamster across 1 procedure code in 2024, for 21 Medicare patients. Medicare paid $124 for them. Every service was in an office.
Dr. Seamster compared with the California median for internists, 2024
- Dr. Seamster
- California median
- Medicare services
- 13vs 36196% below
- Medicare patients
- 21vs 15186% below
- Part D claims
- 36vs 42191% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Seamster'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Roderick Negal Seamster treated 21 Medicare patients in 2024, average age 70
CMS counts 21 Medicare patients who saw Dr. Seamster in 2024. 75% of them have high cholesterol, and 71% have diabetes. Their average risk score is 1.57, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Seamster's median patient age at 47, with 49% women.
Chronic conditions among Dr. Seamster's Medicare patients, 2024
- High cholesterol75%
- Diabetes71%
- High blood pressure71%
Share of Medicare patients with each condition. A patient can have several.
Dr. Seamster's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 47
Patient panel by sex, all payers
- Women49%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Roderick Negal Seamster wrote 89 Medicare Part D claims in 2024
In 2024, Dr. Seamster wrote 89 Medicare Part D claims for 33 patients. 97% of them were for generic drugs. CMS names the drug for 36 of them, across 2 drugs with 11 or more claims each, at $762 in total drug cost.
Dr. Seamster's Part D claims by kind of drug, 2024
- Generic86 claims97%
- Brand-name and other3 claims3%
Dr. Seamster'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. Seamster's Part D claims, 2024
- Opioids56%50 of 89 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
How Dr. Roderick Negal Seamster takes part in Medicare
Dr. Seamster accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Roderick Negal Seamster received $537 in industry payments from 2017 to 2019
CMS Open Payments shows 5 general payments to Dr. Seamster from 3 drug and device companies from 2017 to 2019. Food and beverage make up the largest share, 100% of the total. Theratechnologies Inc. paid the most, $250.
General payments to Dr. Seamster by program year, 2017 to 2019
Companies that paid Dr. Seamster the most, 2017 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Roderick Negal Seamster graduated from Harvard Medical School
Dr. Seamster graduated from Harvard Medical School in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Roderick Negal Seamster'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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Roderick Negal Seamster
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. Roderick Negal Seamster's NPI number?
Dr. Roderick Negal Seamster's NPI number is 1407951551. It was assigned on September 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Roderick Negal Seamster?
Dr. Roderick Negal Seamster is an internist in Sausalito, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Roderick Negal Seamster practice?
Dr. Seamster practices at 630 Drake Ave, Sausalito, CA 94965. Dr. Seamster's primary practice is Marin City Health and Wellness Dental Van in Sausalito, California. Dmand AI also links Dr. Seamster to 1 group practice or clinic.
What is Dr. Roderick Negal Seamster's office phone number?
The practice phone on file for Dr. Seamster is (415) 339-8813.
What is Dr. Roderick Negal Seamster's medical license number?
Dr. Seamster holds California license G64516.
What medical group is Dr. Roderick Negal Seamster part of?
Dr. Seamster is linked to Marin City Health & Wellness Center.
Does Dr. Roderick Negal Seamster accept Medicare?
Yes. CMS data shows Dr. Seamster billed Medicare for 13 services in 2024, and Dr. Seamster accepts Medicare assignment.
How many Medicare patients does Dr. Roderick Negal Seamster see?
CMS counts 21 Medicare patients who saw Dr. Seamster in 2024, with an average age of 70.
What services does Dr. Roderick Negal Seamster bill to Medicare?
In 2024, Dr. Seamster's most billed Medicare services were lab and pathology test (83036).
Where did Dr. Roderick Negal Seamster go to medical school?
Dr. Seamster graduated from Harvard Medical School in 1987.
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What drugs does Dr. Roderick Negal Seamster prescribe most?
In 2024 Medicare Part D data, Dr. Seamster's most prescribed drugs by claims were Oxycodone HCl and Hydrocodone-Acetaminophen.
Has Dr. Roderick Negal Seamster received payments from drug or device companies?
CMS Open Payments shows $537 in general payments to Dr. Seamster from 3 companies from 2017 to 2019. The largest total came from Theratechnologies Inc.
How long has Dr. Roderick Negal Seamster been practicing?
Dr. Seamster graduated from medical school in 1987, 39 years ago.
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