Barbara Fretwell, MD
NPI 1578561429 · Internal Medicine Physician · Lansing, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Barbara Fretwell, MD is a Internal Medicine Physician provider in Lansing, MI (NPI 1578561429).
Provider details
- NPI number
- 1578561429
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- BF048529 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 58 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 172 | 69 |
| Losartan Potassium | 144 | 60 |
| Atorvastatin Calcium | 110 | 45 |
| Lisinopril | 106 | 42 |
| Omeprazole | 91 | 44 |
| Amlodipine Besylate | 73 | 30 |
| Escitalopram Oxalate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$37 across 2 records (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
- 2005-07-13
- Last updated
- 2007-07-11
Frequently asked questions
- What is Barbara Fretwell's NPI number?
- Barbara Fretwell's National Provider Identifier (NPI) is 1578561429, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Barbara Fretwell's specialty?
- Barbara Fretwell is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Barbara Fretwell located?
- Barbara Fretwell's practice location on file with NPPES is 3955 Patient Care Way, Lansing, MI 48911-4299.
- What is Barbara Fretwell's phone number?
- The practice phone number listed in the NPPES registry for Barbara Fretwell is (517) 374-7600.
- Does Barbara Fretwell accept Medicare?
- Barbara Fretwell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Barbara Fretwell's NPI active?
- Yes — Barbara Fretwell's NPI (1578561429) is active in the NPPES registry as of the last update on 2007-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.