WILLIAM DEMARCO (DO) – Internal Medicine Physician, NPI 1124103577
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
7,722 INTERNAL MEDICINE in MA
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Provider Addresses for WILLIAM DEMARCO (DO)
Berkshire Medical Center, 725, North Street, Pittsfield, Berkshire County, Massachusetts, 01201, United States
PITTSFIELD, MA 01201
Phone: (413) 496-6820
Fax: (413) 496-6821
Type: Mailing
Fairview Hospital, 29, Lewis Avenue, Berkshire Heights, Great Barrington, Berkshire County, Massachusetts, 01230, United States
GREAT BARRINGTON, MA 01230
Phone: (413) 496-6820
Fax: (413) 496-6821
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2025-05-22
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20040611001446 | I | Internal Medicine | MA | TBD |
| I20250522000648 | I | Internal Medicine | MI | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 01201)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| A N E S T H E S I O L O G Y | MA | |
| Certified Registered Nurse Anesthetist (Crna) | MA | |
| Emergency Medicine | MA | |
| Certified Registered Nurse Anesthetist (Crna) | VA | |
| Emergency Medicine | MI | |
| Emergency Medicine | MA | |
| Nurse Practitioner | MA | |
| Emergency Medicine | MA | |
| A N E S T H E S I O L O G Y | MA | |
| - | OR |
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