Mary Callahan, D.O.
NPI 1518968882 · Cardiovascular Disease Physician · Sandwich, MA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Callahan, D.O. is a Cardiovascular Disease Physician provider in Sandwich, MA (NPI 1518968882).
Provider details
- NPI number
- 1518968882
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 160179 (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
20 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
1,525 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 | 632 | $129 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 452 | $14 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 131 | $202 |
| Technetium Tc-99m Sestamibi, Diagnostic, Per Study DoseA9500 | 108 | $125 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Supervision and Review By Physician93015 | 71 | $73 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 321 | 89 |
| Valsartan | 158 | 45 |
| Rosuvastatin Calcium | 150 | 54 |
| Amlodipine Besylate | 144 | 43 |
| Lisinopril | 139 | 42 |
| Atorvastatin Calcium | 137 | 41 |
| Pravastatin Sodium | 105 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$563 across 28 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
- 2005-08-09
- Last updated
- 2026-03-04
- Certified
- 2026-03-04
Frequently asked questions
- What is Mary Callahan's NPI number?
- Mary Callahan's National Provider Identifier (NPI) is 1518968882, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Callahan's specialty?
- Mary Callahan is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Callahan located?
- Mary Callahan's practice location on file with NPPES is 68a Route 6a, Sandwich, MA 02563-1757.
- What is Mary Callahan's phone number?
- The practice phone number listed in the NPPES registry for Mary Callahan is (774) 413-5457.
- Does Mary Callahan accept Medicare?
- Mary Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Callahan's NPI active?
- Yes — Mary Callahan's NPI (1518968882) is active in the NPPES registry as of the last update on 2026-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.