Quick answers
- Does Theron M. Ohalloran accept Medicare assignment?
- Yes. Medicare's clinician data says Theron M. Ohalloran accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Theron M. Ohalloran see?
- In 2024, CMS data shows 13 Original Medicare patients and 29 services for Theron M. Ohalloran. This counts Original Medicare only and measures volume, not quality.
- What is Theron M. Ohalloran's NPI number?
- 1093344145. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Theron M. Ohalloran, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 13 |
|---|---|
| Services billed to Medicare | 29 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 60 |
Hospitals where Theron M. Ohalloran works
Medicare's Facility Affiliation Data lists Theron M. Ohalloran at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- University of MD Baltimore Washington Medical CenterGlen Burnie, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210043
Practice locations
Addresses where Theron M. Ohalloran is enrolled with Medicare (CMS data updated October 2, 2026).
- 3708 Mountain Rd, Suite A1Pasadena, MD 21122 (410) 553‑8265
- 7556 Teague Rd, Suite 430Hanover, MD 21076 (410) 553‑8540
Group practices
Medicare enrollment lists Theron M. Ohalloran as a member of this group (CMS data updated October 2, 2026).
- University of Maryland Community Medical Group Inc477 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Maryland
Clinicians with the same Medicare primary specialty in Maryland — not a recommendation.
Other clinicians in University of Maryland Community Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Western Michigan Un Homer Stryker School Of Med |
| Graduation year | 2020 (6 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1093344145 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians