Quick answers
- Does Marcia L. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Marcia L. Obrien 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 Marcia L. Obrien see?
- In 2024, CMS data shows 204 Original Medicare patients and 550 services for Marcia L. Obrien. This counts Original Medicare only and measures volume, not quality.
- What is Marcia L. Obrien's NPI number?
- 1558348524. 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 Marcia L. Obrien, 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 | 204 |
|---|---|
| Services billed to Medicare | 550 |
| Different services or procedures | 35 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)78 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)67 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)66 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)32 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)26 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure73%
- Chronic kidney disease55%
- Arthritis49%
- Diabetes30%
- Depression30%
Hospitals where Marcia L. Obrien works
Medicare's Facility Affiliation Data lists Marcia L. Obrien 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.
- Mayo Clinic Hospital RochesterRochester, MN · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 240010
Practice locations
Addresses where Marcia L. Obrien is enrolled with Medicare (CMS data updated October 2, 2026).
- 1216 2nd St SWRochester, MN 55902 (507) 255‑5123
- 200 1st St SWRochester, MN 55905
- 3033 41st St NWRochester, MN 55901 (507) 284‑2511
- 3041 Stonehedge Dr NERochester, MN 55906 (507) 538‑8500
- 411 W Main StKasson, MN 55944 (507) 634‑7011
Group practices
Medicare enrollment lists Marcia L. Obrien as a member of this group (CMS data updated October 2, 2026).
- Mayo Clinic4,956 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Rochester
Clinicians with the same Medicare primary specialty in Rochester, MN — not a recommendation.
Other clinicians in Mayo Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1558348524 |
| 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