Erin O'Hara, M.D.
Internal Medicine Physician · Gardner, MA
Erin O'Hara, M.D. is an internal medicine physician with a practice address in Gardner, Massachusetts, and NPI 1942407077, issued on Jul 2, 2007. Check the license (Massachusetts 239461, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Erin O'Hara
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 239461 MA
Self-reported in NPPES; status is on the state search - Practice location
- 266 Main St, Gardner, MA 01440
- Phone
- (978) 630-5030
- Enumerated
- Jul 2, 2007
- Record last updated
- Jun 7, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (978) 630-5033
- Medicare enrollment
- Enrolled (PECOS I20100315000263); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 266 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kyle Argo, PA-CMedical Physician Assistant1427415199
- Leanne Belcher, NPNurse Practitioner1053819425
- Katherine Fitzgerald, D.O.Family Medicine Physician1134357346
- Tina Griffin, DNP, FNP-CFamily Nurse Practitioner1295722072
- Kristina Lahtinen, PA-CPhysician Assistant1043765381
- Erica Lasorsa, PA-CPhysician Assistant1245409879
Verify Erin O'Hara in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 239461Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,740 Medicare Part D claims for 283 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 134 claims were for opioids.
Most prescribed
- Atorvastatin Calcium217 claims
- Levothyroxine Sodium96 claims
- Lisinopril92 claims
- Amlodipine Besylate82 claims
- Omeprazole81 claims
- Metformin Hcl Er77 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
- Heywood Medical Group Inc.Gardner, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Erin O'Hara among 6,825 internal medicine physician records in Massachusetts
Erin O'Hara, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2007 · median 2004 among the 4,103 with a school on file
- Record last updated2016 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Massachusetts
There are 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Gardner → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nithya Agrawal, MD., MS., MPHGardner, MA 014401982811212
- Aqueel Imran, M.D.Gardner, MA 014401750581963
- Hanish Jain, MDGardner, MA 014401518443019
- Sandra Howard, M.D.Ayer, MA 014341487803011
- Sanjay Basu, MDAyer, MA 014321285682450
- Susan Lucas, MDAyer, MA 014321497744676
- Alfred Heinser, MDGroton, MA 014501871570218
- Vandana Sahay, MDGroton, MA 014501881683068
Common questions
What is Erin O'Hara, M.D.'s NPI number?
Erin O'Hara, M.D.'s National Provider Identifier (NPI) is 1942407077, issued on Jul 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Erin O'Hara, M.D. located?
The NPPES record lists a practice address at 266 Main St, Gardner, MA, 01440. Phone: (978) 630-5030. Providers update this record themselves, so call before visiting.
How can I verify Erin O'Hara, M.D.'s license?
NPPES lists Massachusetts license number 239461, as entered by the provider. 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 O'Hara, M.D. prescribe under Medicare Part D?
In 2024, Erin O'Hara, M.D. had 2,740 Medicare Part D claims for 283 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.