Gerard Stephen O'Connor, M.D.
Family Medicine Physician · Chestertown, MD
Gerard Stephen O'Connor, M.D. is a family medicine physician with a practice address in Chestertown, Maryland, and NPI 1609879873, issued on May 23, 2005. Check the license (Maryland D0030368, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Gerard Stephen O'Connor
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- D0030368 MD
Self-reported in NPPES; status is on the state search - Practice location
- 100 Brown St, Chestertown, MD 21620
- Phone
- (410) 778-6303
- Enumerated
- May 23, 2005
- Record last updated
- Jun 5, 2023
- Fax
- (410) 778-6306
- Medicaid ID
- 390710400 MD
- Medicare enrollment
- Enrolled (PECOS I20090527000305); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 1978
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,912 in Maryland → Look up another NPI →
Also registered at 100 Brown St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Freddy Araujo-Vidal, M.D.Specialist1689612103
- Patrick Callahan, MDAnesthesiology Physician1447218060
- Teresa Campos, PA-CPhysician Assistant1942489430
- Beverly Clarke, M.S.N., R.N., C.R.N.Family Nurse Practitioner1407941214
- Peter Clements, RNFARegistered Nurse First Assistant1114123007
- Keri Jacobs, MDEmergency Medical Services (Emergency Medicine) Physician1104952308
Verify Gerard Stephen O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0030368Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average family medicine physician in 2024
408 Medicare Part D claims for 235 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Methylprednisolone105 claims
- Azithromycin44 claims
- Doxycycline Hyclate33 claims
- Cephalexin20 claims
- Amoxicillin-Clavulanate Potass18 claims
- Nitrofurantoin Mono-Macro17 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
- Eastern Shore Urgent Care LLCChestertown, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gerard Stephen O'Connor among 1,912 family medicine physician records in Maryland
Gerard Stephen O'Connor, M.D. is one of 1,912 family medicine physician records with a practice address in Maryland. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1978 · median 2004 among the 1,141 with a school on file
- Record last updated2023 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 family medicine physician records list a practice address in Chestertown
They are 7 of the 229 NPPES records with a practice address in Chestertown, and 1,912 family medicine physician records in Maryland.
All 1,912 in Maryland → Every provider in Chestertown → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Wayne Benjamin, MDChestertown, MD 216201992761472
- Caleb Consenstein, MDChestertown, MD 216201801325444
- Frederick Delboy, MDChestertown, MD 216201245299932
- Andrew Ferguson, M.D.Chestertown, MD 216201427037415
- Susan Ross, M.D.Chestertown, MD 216201417950080
- Patrick Shanahan, M.D.Chestertown, MD 216201275512253
- Richard Brown, MDChester, MD 216191487986287
- Leo Cherrick, M. D.Chester, MD 216191437209111
Common questions
What is Gerard Stephen O'Connor, M.D.'s NPI number?
Gerard Stephen O'Connor, M.D.'s National Provider Identifier (NPI) is 1609879873, issued on May 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gerard Stephen O'Connor, M.D. located?
The NPPES record lists a practice address at 100 Brown St, Chestertown, MD, 21620. Phone: (410) 778-6303. Providers update this record themselves, so call before visiting.
How can I verify Gerard Stephen O'Connor, M.D.'s license?
NPPES lists Maryland license number D0030368, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gerard Stephen O'Connor, M.D. prescribe under Medicare Part D?
In 2024, Gerard Stephen O'Connor, M.D. had 408 Medicare Part D claims for 235 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.