Theron O'Halloran, MD
Obstetrics & Gynecology Physician · Glen Burnie, MD
Theron O'Halloran, MD is an obstetrics & gynecology physician with a practice address in Glen Burnie, Maryland, and NPI 1093344145, issued on Apr 1, 2020. Check the license (Maryland D0100658, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Theron O'Halloran
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- D0100658 MD
Self-reported in NPPES; status is on the state search - Practice location
- 301 Hospital Dr, Glen Burnie, MD 21061
- Phone
- (410) 787-4000
- Enumerated
- Apr 1, 2020
- Record last updated
- Sep 23, 2025
- Medicare enrollment
- Enrolled (PECOS I20240926004355); accepts Medicare assignment
- Medical or professional school
- Western Michigan Un Homer Stryker School Of Med, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 1,034 in Maryland → Look up another NPI →
Also registered at 301 Hospital Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven Abert, MDEmergency Medicine Physician1932142122
- Omoyemi Adebayo, M.D.Emergency Medicine Physician1063788842
- Hajara AdebowaleNurse Practitioner1265161491
- Omolara Adewuni, M.D.Internal Medicine Physician1336317676
- Chinaemerem Agbakwuru, M.D.Pediatrics Physician1467865915
- Courtney Ajello, DNP, CRNACertified Registered Nurse Anesthetist1295439131
Verify Theron O'Halloran in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0100658Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
11 Medicare Part D claims, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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
- University OF Maryland Community Medical Group IncHanover, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Theron O'Halloran among 1,034 obstetrics & gynecology physician records in Maryland
Theron O'Halloran, MD is one of 1,034 obstetrics & gynecology physician records with a practice address in Maryland. 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 2020, is newer than 93% of them.
- NPI issued2020 · 93% of these records are older, 4% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2020 · median 2005 among the 597 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Maryland
There are 1,034 obstetrics & gynecology physician records in Maryland.
All 1,034 in Maryland → Every provider in Glen Burnie → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Adegboyega Adejana, M.D.Glen Burnie, MD 210611316149909
- Rubiliatu Akinwande, M.D., MPH, MATGlen Burnie, MD 210611336598366
- Carlos Alarcon, M.D.Glen Burnie, MD 210611336108992
- Jacqueline Cunkelman, MDGlen Burnie, MD 210611730380122
- Sarah Evans, MDGlen Burnie, MD 210611790280352
- Renato Flores, MDGlen Burnie, MD 210611750387908
- David Ghadisha, MDGlen Burnie, MD 210611881720225
- Bharathi Gowda, MDGlen Burnie, MD 210611568532208
Common questions
What is Theron O'Halloran, MD's NPI number?
Theron O'Halloran, MD's National Provider Identifier (NPI) is 1093344145, issued on Apr 1, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Theron O'Halloran, MD located?
The NPPES record lists a practice address at 301 Hospital Dr, Glen Burnie, MD, 21061. Phone: (410) 787-4000. Providers update this record themselves, so call before visiting.
How can I verify Theron O'Halloran, MD's license?
NPPES lists Maryland license number D0100658, 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 Theron O'Halloran, MD prescribe under Medicare Part D?
In 2024, Theron O'Halloran, MD had 11 Medicare Part D claims; the average among obstetrics & gynecology physician prescribers was 165. 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.