Mary Marshall, M.D.
NPI 1245320589 · Family Medicine Physician · Grand Blanc, MI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Marshall, M.D. is a Family Medicine Physician provider in Grand Blanc, MI (NPI 1245320589).
Provider details
- NPI number
- 1245320589
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- MM070680 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
436 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| 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 | 110 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 103 | $122 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 73 | $123 |
| Advance Care Planning, First 30 Minutes99497 | 54 | $19 |
| Urinalysis, Manual Test81002 | 37 | $3 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 303 | 76 |
| Atorvastatin Calcium | 182 | 47 |
| Lisinopril | 177 | 54 |
| Simvastatin | 115 | 36 |
| Losartan Potassium | 111 | 33 |
| Apixabanbrand: Eliquis | 107 | 21 |
| Amlodipine Besylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$17 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2011-08-10
Frequently asked questions
- What is Mary Marshall's NPI number?
- Mary Marshall's National Provider Identifier (NPI) is 1245320589, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Marshall's specialty?
- Mary Marshall is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Marshall located?
- Mary Marshall's practice location on file with NPPES is 8195 S Saginaw St, Grand Blanc, MI 48439-1885.
- What is Mary Marshall's phone number?
- The practice phone number listed in the NPPES registry for Mary Marshall is (810) 695-2210.
- Does Mary Marshall accept Medicare?
- Mary Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Marshall's NPI active?
- Yes — Mary Marshall's NPI (1245320589) is active in the NPPES registry as of the last update on 2011-08-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.