MARK STEWART AMSTER (MD) – Dermatology Physician, NPI 1518947068
Dermatology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
744 DERMATOLOGY in MA
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Provider Addresses for MARK STEWART AMSTER (MD)
18, Whispering Lane, Natick, Middlesex County, Massachusetts, 01760, United States
NATICK, MA 017605883
Phone: (508) 655-2072
Type: Mailing
280, Washington Street, Aberdeen, Brighton, Boston, Suffolk County, Massachusetts, 02135, United States
SUITE 212
BRIGHTON, MA 021353511
Phone: (617) 783-7100
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 225 Open Payments records for all available years, with a total value of $142,988.
Total Amount is formed as General ($12,961) + Research ($130,027) + Ownership ($0) = $142,988.
Last reported payment date: 2024-12-20 • Largest payer in this snapshot: Nielsen BioSciences, Inc. ($124,660).
Total Amount
$142,988
General + Research + Ownership
Payments
225
Total payment records
General Amount
$12,961
General payments
Research Amount
$130,027
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-20
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Nielsen BioSciences, Inc. | $124,660 |
| Galderma Laboratories, L.P. | $8,174 |
| SANOFI US SERVICES INC. | $3,767 |
| ABBVIE INC. | $2,088 |
| Merck Sharp & Dohme LLC | $723 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2006-03-30
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060330000616 | I | Dermatology | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 17003 | Destruction of precancer skin growth, 2-14 growths | 3,212 | 536 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 1,282 | 984 | $0 |
| 17000 | Destruction of precancer skin growth, 1 growth | 952 | 684 | $0 |
| 11102 | Biopsy of related skin growth, first growth | 613 | 511 | $0 |
| 11301 | Shaving of skin growth of body, arms, or legs, 0.6-1.0 cm | 199 | 144 | $0 |
Insurance plans in this area (ZIP 01760)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| DERMATOLOGY | MA | 11101 | Biopsy of each additional growth of skin and/or tissue | 209 | 145 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| D E R M A T O L O G Y | MA | |
| Physician Assistant | MA |
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