Nathan Riddell, M.D.
NPI 1245670983 · Cardiovascular Disease Physician · Worcester, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathan Riddell, M.D. is a Cardiovascular Disease Physician provider in Worcester, MA (NPI 1245670983).
Provider details
- NPI number
- 1245670983
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 273386 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 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
2,171 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 833 | $8 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 254 | $71 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 250 | $16 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 103 | $82 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 85 | $140 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 181 | 55 |
| Atorvastatin Calcium | 171 | 55 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 113 | 33 |
| Spironolactone | 100 | 33 |
| Furosemide | 75 | 29 |
| Lisinopril | 74 | 29 |
| Apixaban |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,562 across 26 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
Additional practice locations (1)
- 1115 Westford St Ste 2Lowell, MA 01851-2853Phone: (351) 221-7080
Registry dates
- Enumerated
- 2013-06-26
- Last updated
- 2025-12-08
- Certified
- 2025-12-08
Frequently asked questions
- What is Nathan Riddell's NPI number?
- Nathan Riddell's National Provider Identifier (NPI) is 1245670983, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathan Riddell's specialty?
- Nathan Riddell is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Nathan Riddell located?
- Nathan Riddell's practice location on file with NPPES is 55 Lake Ave N, Worcester, MA 01655-0002.
- What is Nathan Riddell's phone number?
- The practice phone number listed in the NPPES registry for Nathan Riddell is (508) 334-1000.
- Does Nathan Riddell accept Medicare?
- Nathan Riddell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathan Riddell's NPI active?
- Yes — Nathan Riddell's NPI (1245670983) is active in the NPPES registry as of the last update on 2025-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.