Quick answers
- Does Mary S. Jacob accept Medicare assignment?
- Yes. Medicare's clinician data says Mary S. Jacob 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.
- What is Mary S. Jacob's NPI number?
- 1225321755. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary S. Jacob works
Medicare's Facility Affiliation Data lists Mary S. Jacob 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.
- Holy Cross HospitalSilver Spring, MD · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 210004
- MedStar Montgomery Medical CenterOlney, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210018
Practice locations
Addresses where Mary S. Jacob is enrolled with Medicare (CMS data updated October 2, 2026).
- 19801 Observation DrGermantown, MD 20876 (301) 754‑7500
- 25500 Point Lookout RdLeonardtown, MD 20650 (240) 434‑4088
- 9000 Franklin Square DrBaltimore, MD 21237 (443) 777‑7000
Group practices
Medicare enrollment lists Mary S. Jacob as a member of these groups (CMS data updated October 2, 2026).
- MedStar Medical Group II LLC3,767 clinicians in the group
- Cep America LLC1,023 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Maryland
Clinicians with the same Medicare primary specialty in Maryland — not a recommendation.
Other clinicians in MedStar Medical Group II LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225321755 |
| 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
- 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