Melissa Mahr, M.D.
NPI 1164441705 · Internal Medicine Physician · Hopkinton, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Melissa Mahr, M.D. is a Internal Medicine Physician provider in Hopkinton, MA (NPI 1164441705).
Provider details
- NPI number
- 1164441705
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 205104 (MA)
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
568 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 225 | $137 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 114 | $97 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 103 | $141 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 35 | $196 |
| Administration of Influenza Virus VaccineG0008 | 26 | $35 |
| Administration of Pneumococcal VaccineG0009 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 64 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 227 | 77 |
| Lisinopril | 198 | 64 |
| Levothyroxine Sodium | 176 | 51 |
| Amlodipine Besylate | 173 | 50 |
| Omeprazole | 111 | 32 |
| Hydrochlorothiazide | 103 | 33 |
| Lorazepam | 85 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$72 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
Additional practice locations (1)
- 169 W Main StHopkinton, MA 01748-2101Phone: (508) 731-2570Fax: (508) 625-1354
Registry dates
- Enumerated
- 2006-07-18
- Last updated
- 2025-09-03
- Certified
- 2025-09-03
Frequently asked questions
- What is Melissa Mahr's NPI number?
- Melissa Mahr's National Provider Identifier (NPI) is 1164441705, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Mahr's specialty?
- Melissa Mahr is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Melissa Mahr located?
- Melissa Mahr's practice location on file with NPPES is 77 W Main St Ste 204, Hopkinton, MA 01748-1689.
- What is Melissa Mahr's phone number?
- The practice phone number listed in the NPPES registry for Melissa Mahr is (508) 731-2570.
- Does Melissa Mahr accept Medicare?
- Melissa Mahr is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Melissa Mahr's NPI active?
- Yes — Melissa Mahr's NPI (1164441705) is active in the NPPES registry as of the last update on 2025-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.