Marcia O Brien, M.D.
NPI 1558348524 · Family Medicine Physician · Rochester, MN
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcia O Brien, M.D. is a Family Medicine Physician provider in Rochester, MN (NPI 1558348524).
Provider details
- NPI number
- 1558348524
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 43748 (MN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
393 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 78 | $78 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 67 | $129 |
| 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'SG2211 | 66 | $16 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 32 | $181 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 26 | $171 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 39 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 93 | 30 |
| Rosuvastatin Calcium | 77 | 23 |
| Levothyroxine Sodium | 65 | 18 |
| Amlodipine Besylate | 64 | 21 |
| Losartan Potassium | 64 | 22 |
| Metformin Hclbrand: Metformin Hcl Er | 57 | 20 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-29
- Last updated
- 2020-08-19
- Certified
- 2020-08-19
Frequently asked questions
- What is Marcia O Brien's NPI number?
- Marcia O Brien's National Provider Identifier (NPI) is 1558348524, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcia O Brien's specialty?
- Marcia O Brien is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marcia O Brien located?
- Marcia O Brien's practice location on file with NPPES is 200 1st St Sw, Rochester, MN 55905-0001.
- What is Marcia O Brien's phone number?
- The practice phone number listed in the NPPES registry for Marcia O Brien is (507) 284-2511.
- Does Marcia O Brien accept Medicare?
- Marcia O Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcia O Brien's NPI active?
- Yes — Marcia O Brien's NPI (1558348524) is active in the NPPES registry as of the last update on 2020-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.