Erin Colleen O'Fallon, M.D. M.P.H.
Geriatric Medicine (Internal Medicine) Physician · Boston, MA
Erin Colleen O'Fallon, M.D. M.P.H. is a geriatric medicine (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1801853205, issued on Apr 28, 2006. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Erin Colleen O'Fallon
- Credential
- M.D. M.P.H.
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 45268 MN
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis Street Brigham And Womens Hospital,, Boston, MA 02215
- Phone
- (617) 525-8281
- Enumerated
- Apr 28, 2006
- Record last updated
- Aug 31, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20060926000007); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 2001
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 225 in Massachusetts → Look up another NPI →
Verify Erin Colleen O'Fallon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
36 Medicare Part D claims for 17 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D.
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
- Brigham And Womens Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Erin Colleen O'Fallon among 225 geriatric medicine (internal medicine) physician records in Massachusetts
Erin Colleen O'Fallon, M.D. M.P.H. is one of 225 geriatric medicine (internal medicine) physician records with a practice address in Massachusetts. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 44% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2001 · median 2000 among the 119 with a school on file
- Record last updated2011 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Massachusetts
There are 225 geriatric medicine (internal medicine) physician records in Massachusetts.
All 225 in Massachusetts → Every provider in Boston → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Virginia Cummings, M.D.Boston, MA 022151972543403
- Kirstyn James, MDBoston, MA 022151619454733
- Dae Hyun Kim, M.D., M.P.H.Boston, MA 022151013123504
- Edward Marcantonio, M.D.Boston, MA 022151881671485
- Melissa Mattison, MDBoston, MA 022151154310670
- Devyani Misra, M.D.Boston, MA 022151790946648
- Medha Munshi, M.D.Boston, MA 022151699733659
- Patricia O'Sullivan, M.D.Boston, MA 022151760460844
Common questions
What is Erin Colleen O'Fallon, M.D. M.P.H.'s NPI number?
Erin Colleen O'Fallon, M.D. M.P.H.'s National Provider Identifier (NPI) is 1801853205, issued on Apr 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Erin Colleen O'Fallon, M.D. M.P.H. located?
The NPPES record lists a practice address at 75 Francis Street Brigham And Womens Hospital,, Boston, MA, 02215. Phone: (617) 525-8281. Providers update this record themselves, so call before visiting.
How can I verify Erin Colleen O'Fallon, M.D. M.P.H.'s license?
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 Erin Colleen O'Fallon, M.D. M.P.H. prescribe under Medicare Part D?
In 2024, Erin Colleen O'Fallon, M.D. M.P.H. had 36 Medicare Part D claims for 17 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.