MARSHALL ROB CHAMBERLIN (MD) – Internal Medicine Physician, NPI 1003044488
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
916 INTERNAL MEDICINE in ME
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Provider Addresses for MARSHALL ROB CHAMBERLIN (MD)
190, Riverside Street, Sagamore Village, Portland, Cumberland County, Maine, 04103, United States
SUITE 6B
PORTLAND, ME 041031073
Phone: (207) 661-2000
Type: Mailing
300, Professional Drive, Portland Farms Proefessional Center, Oak Hill, Scarborough, Cumberland County, Maine, 04074, United States
SUITE 2B
SCARBOROUGH, ME 040748897
Phone: (207) 883-3491
Fax: (207) 885-5587
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: 2015-10-22
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 |
|---|---|---|---|---|
| I20151022001228 | I | Internal Medicine | ME | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 43 | 25 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 16 | 16 | $0 |
Insurance plans in this area (ZIP 04103)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | PA | |
| - | ME | |
| - | ME | |
| Cardiovascular Disease (Cardiology) | ME | |
| - | ME | |
| - | ME | |
| Family Practice, Hospice/Palliative Care | ME | |
| Pediatric Medicine, Endocrinology | MA | |
| Nurse Practitioner | ME | |
| Clinical Social Worker | ME |
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