Mark Stewart Amster, MD
Dermatology Physician · Brighton, MA
Mark Stewart Amster, MD is a dermatology physician with a practice address in Brighton, Massachusetts, and NPI 1518947068, issued on Jan 19, 2006. Check the license (Massachusetts 70448, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark Stewart Amster
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 70448 MA
Self-reported in NPPES; status is on the state search - Practice location
- 280 Washington St, Brighton, MA 02135
- Phone
- (617) 783-7100
- Enumerated
- Jan 19, 2006
- Record last updated
- Jul 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20060330000616); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 1987
- Entity
- Type 1 · individual
Also registered at 280 Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Brown, MDDermatology Physician1104995133
- Xuemeng Chen, RDN, LDNRegistered Dietitian1013515469
- William Eichhold, RDOOptician1841547734
- Frederick Gates, PHDPsychologist1528166188
- Susan Gipson, NPSpecialist1841370962
- Janice Gould, NPSpecialist1730261173
Verify Mark Stewart Amster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 70448Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% more Medicare Part D claims than the average dermatology physician in 2024
980 Medicare Part D claims for 430 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Betamethasone Diprop Augmented122 claims
- Betamethasone Dipropionate93 claims
- Clobetasol Propionate86 claims
- Ketoconazole64 claims
- Dupixent Pen62 claims
- Metronidazole53 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: $10,226.70
116 payments; by number, the most common kind was food and beverage; the largest payer was Galderma Laboratories, L.P. The 10,250 providers of this specialty with any payment received $8,544.61 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 2 group practices
- Mark Amster DermBrighton, MA
- Newton Watertown Dermatology Assoc. PCBrighton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dermatology Physician providers in Massachusetts
There are 627 dermatology physician records in Massachusetts.
Other dermatology physician records in Massachusetts
- Zainab AbbasWorcester, MA1609028000
- Christopher Adams, M.D.Boston, MA1871777615
- Adewunmi Adelaja, MD, PHDBoston, MA1396488615
- David Aghassi, MDWellesley, MA1285698936
- Abdul Ahmed, MDBoston, MA1417947516
- Ali Al-Haseni, M.D.Boston, MA1144751777
- Abdullah Alajaji, MDBoston, MA1356698351
- Rhoda Alani, M.D.Boston, MA1154385268
- Christina Alavian, M.D.Worcester, MA1356376461
- Lee Albert, MDMilford, MA1619974102
Common questions
What is Mark Stewart Amster, MD's NPI number?
Mark Stewart Amster, MD's National Provider Identifier (NPI) is 1518947068, issued on Jan 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Stewart Amster, MD located?
The NPPES record lists a practice address at 280 Washington St, Brighton, MA, 02135. Phone: (617) 783-7100. Providers update this record themselves, so call before visiting.
How can I verify Mark Stewart Amster, MD's license?
NPPES lists Massachusetts license number 70448, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Stewart Amster, MD prescribe under Medicare Part D?
In 2024, Mark Stewart Amster, MD had 980 Medicare Part D claims for 430 beneficiaries; the average among dermatology physician prescribers was 797. 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.