Nathan E. Riddell, M.D.
Cardiovascular Disease Physician · Worcester, MA
Nathan E. Riddell, M.D. is a cardiovascular disease physician with a practice address in Worcester, Massachusetts, and NPI 1245670983, issued on Jun 26, 2013. Check the license (Massachusetts 273386, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Nathan E. Riddell
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License numbers
- 273386 MA
256554 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lake Ave N, Worcester, MA 01655
- Phone
- (508) 334-1000
- Enumerated
- Jun 26, 2013
- Record last updated
- Dec 8, 2025
- Medicare enrollment
- Enrolled (PECOS I20180809005466); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 1,080 in Massachusetts → Look up another NPI →
Also registered at 55 Lake Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Amarys Abadie, CRNACertified Registered Nurse Anesthetist1992936843
- Paula Abate, NPNurse Practitioner1336265909
- Aly AbayazeedDiagnostic Radiology Physician1821221946
- Zainab AbbasDermatology Physician1609028000
- Mary-Alice Abbott, MDClinical Genetics (M.D.) Physician1982799417
Verify Nathan E. Riddell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 273386Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
1,331 Medicare Part D claims for 235 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Metoprolol Succinate181 claims
- Atorvastatin Calcium171 claims
- Clopidogrel113 claims
- Spironolactone100 claims
- Furosemide75 claims
- Lisinopril74 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,562.01
26 payments; by number, the most common kind was food and beverage; the largest payer was Penumbra, Inc. The 16,686 providers of this specialty with any payment received $3,819.56 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Lgh Merrimack Valley Cardiology Associates, LLCNorth Chelmsford, MA
- Tvcg Ste PLLCLowell, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan E. Riddell among 1,080 cardiovascular disease physician records in Massachusetts
Nathan E. Riddell, M.D. is one of 1,080 cardiovascular disease physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 78% of them.
- NPI issued2013 · 78% of these records are older, 19% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2013 · median 2001 among the 698 with a school on file
- Record last updated2025 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Massachusetts
There are 1,080 cardiovascular disease physician records in Massachusetts.
All 1,080 in Massachusetts → Every provider in Worcester → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Gerard Aurigemma, M.D.Worcester, MA 016551487637062
- Naomi Botkin, M.D.Worcester, MA 016551831172766
- Henri Cuenoud, M.D.Worcester, MA 016551548244601
- Seth Dahlberg, M.D.Worcester, MA 016551639152564
- Timothy Fitzgibbons, M.D.Worcester, MA 016551710911565
- Peter Gibson, MDWorcester, MA 016551528028057
- Joel Gore, M.D.Worcester, MA 016551659354132
- Michael Hyder, MDWorcester, MA 016551770527491
Common questions
What is Nathan E. Riddell, M.D.'s NPI number?
Nathan E. Riddell, M.D.'s National Provider Identifier (NPI) is 1245670983, issued on Jun 26, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nathan E. Riddell, M.D. located?
The NPPES record lists a practice address at 55 Lake Ave N, Worcester, MA, 01655. Phone: (508) 334-1000. Providers update this record themselves, so call before visiting.
How can I verify Nathan E. Riddell, M.D.'s license?
NPPES lists Massachusetts license number 273386, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan E. Riddell, M.D. prescribe under Medicare Part D?
In 2024, Nathan E. Riddell, M.D. had 1,331 Medicare Part D claims for 235 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.