Mary Barker, M.D.
NPI 1215908132 · Internal Medicine Physician · Wellesley, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Barker, M.D. is a Internal Medicine Physician provider in Wellesley, MA (NPI 1215908132).
Provider details
- NPI number
- 1215908132
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 79150 (MA)
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
3,493 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 562 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 333 | $94 |
| Hemoglobin A1c Level83036 | 330 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 241 | $13 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 209 | $8 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 197 | $54 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 112 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 734 | 195 |
| Losartan Potassium | 403 | 104 |
| Levothyroxine Sodium | 396 | 105 |
| Amlodipine Besylate | 329 | 88 |
| Lisinopril | 275 | 72 |
| Simvastatin | 250 | 68 |
| Omeprazole | 243 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-30
- Last updated
- 2020-10-22
- Certified
- 2020-10-22
Frequently asked questions
- What is Mary Barker's NPI number?
- Mary Barker's National Provider Identifier (NPI) is 1215908132, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Barker's specialty?
- Mary Barker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Barker located?
- Mary Barker's practice location on file with NPPES is 230 Worcester St, Wellesley, MA 02481-5420.
- What is Mary Barker's phone number?
- The practice phone number listed in the NPPES registry for Mary Barker is (781) 431-5220.
- Does Mary Barker accept Medicare?
- Mary Barker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Barker's NPI active?
- Yes — Mary Barker's NPI (1215908132) is active in the NPPES registry as of the last update on 2020-10-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.