Marshall Rob Chamberlin, MD
Internal Medicine Physician · Scarborough, ME
Marshall Rob Chamberlin, MD is an internal medicine physician with a practice address in Scarborough, Maine, and NPI 1003044488, issued on Jun 24, 2009. Check the license (Maine MD20716, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marshall Rob Chamberlin
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD20716 ME
Self-reported in NPPES; status is on the state search - Practice location
- 300 Professional Dr, Scarborough, ME 04074
- Phone
- (207) 883-3491
- Enumerated
- Jun 24, 2009
- Record last updated
- Mar 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (207) 885-5587
- Medicare enrollment
- Enrolled (PECOS I20151022001228); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 597 in Maine → Look up another NPI →
Also registered at 300 Professional Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dylan AtchleyInternal Medicine Physician1427547470
- Anna Brewer, RN,MSN,APRN,FNP-CFamily Nurse Practitioner1376116053
- Douglas Cowan, MDDiagnostic Radiology Physician1366526816
- Joseph Degrinney, M.D.Internal Medicine Physician1538106679
- Kaitlin Minnehan, M.D.Family Medicine Physician1710419312
- Julie Waldroup, PHARMD, BCACPAmbulatory Care Pharmacist1205208931
Verify Marshall Rob Chamberlin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD20716Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
642 Medicare Part D claims for 93 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 52 claims were for opioids.
Most prescribed
- Albuterol Sulfate Hfa56 claims
- Atorvastatin Calcium38 claims
- Omeprazole29 claims
- Oxycodone Hcl22 claims
- Levothyroxine Sodium17 claims
- Venlafaxine Hcl Er17 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.
Bills Medicare through one group practice
- MainehealthPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marshall Rob Chamberlin among 597 internal medicine physician records in Maine
Marshall Rob Chamberlin, MD is one of 597 internal medicine physician records with a practice address in Maine. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 65% of them.
- NPI issued2009 · 65% of these records are older, 33% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2009 · median 2005 among the 369 with a school on file
- Record last updated2020 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 internal medicine physician records list a practice address in Scarborough
They are 13 of the 1,043 NPPES records with a practice address in Scarborough, and 597 internal medicine physician records in Maine.
All 597 in Maine → Every provider in Scarborough → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dylan AtchleyScarborough, ME 040741427547470
- Jamal Choudhary, MDScarborough, ME 040741003565128
- Joseph Degrinney, M.D.Scarborough, ME 040741538106679
- Michael Delucia, MDScarborough, ME 040741821626557
- Lauren Desmarais, DOScarborough, ME 040741023338704
- Abtin Farahmand, MDScarborough, ME 040741114312774
- Benedict Farino, MDScarborough, ME 040741104912864
- Christine Freme, MDScarborough, ME 040741225123524
Common questions
What is Marshall Rob Chamberlin, MD's NPI number?
Marshall Rob Chamberlin, MD's National Provider Identifier (NPI) is 1003044488, issued on Jun 24, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Marshall Rob Chamberlin, MD located?
The NPPES record lists a practice address at 300 Professional Dr, Scarborough, ME, 04074. Phone: (207) 883-3491. Providers update this record themselves, so call before visiting.
How can I verify Marshall Rob Chamberlin, MD's license?
NPPES lists Maine license number MD20716, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marshall Rob Chamberlin, MD prescribe under Medicare Part D?
In 2024, Marshall Rob Chamberlin, MD had 642 Medicare Part D claims for 93 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.