Marianne Riordan, MD
Endocrinology, Diabetes & Metabolism Physician · Philadelphia, PA
Marianne Riordan, MD is an endocrinology, diabetes & metabolism physician with a practice address in Philadelphia, Pennsylvania, and NPI 1649891961, issued on Apr 27, 2020. Check the license (Pennsylvania MD490718, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Marianne Riordan
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- MD490718 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3401 N Broad St, Philadelphia, PA 19140
- Phone
- (215) 707-4600
- Enumerated
- Apr 27, 2020
- Record last updated
- Jan 30, 2026
- Fax
- (215) 707-5599
- Medicare enrollment
- Enrolled (PECOS I20250909002093); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 485 in Pennsylvania → Look up another NPI →
Also registered at 3401 N Broad St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marianne Riordan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD490718Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
117 Medicare Part D claims for 43 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims.
Most prescribed
- Levothyroxine Sodium18 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.
Bills Medicare through one group practice
- Temple Faculty Practice Plan IncPhiladelphia, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marianne Riordan among 485 endocrinology, diabetes & metabolism physician records in Pennsylvania
Marianne Riordan, MD is one of 485 endocrinology, diabetes & metabolism physician records with a practice address in Pennsylvania. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 94% of them.
- NPI issued2020 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2016 · median 2004 among the 334 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Pennsylvania
There are 485 endocrinology, diabetes & metabolism physician records in Pennsylvania.
All 485 in Pennsylvania → Every provider in Philadelphia → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Jonathan Anolik, MDPhiladelphia, PA 191401760481410
- Darya Bondarenko, DOPhiladelphia, PA 191401245989185
- Regine Boutin, MDPhiladelphia, PA 191401528562915
- Kristin Criner, M.D.Philadelphia, PA 191401093032369
- Ady DjerassiPhiladelphia, PA 191401427076199
- Paul Guido, M.D.Philadelphia, PA 191401568816288
- Amy Iwamaye, MDPhiladelphia, PA 191401255575130
- Maryam Khan, MDPhiladelphia, PA 191401780893826
Common questions
What is Marianne Riordan, MD's NPI number?
Marianne Riordan, MD's National Provider Identifier (NPI) is 1649891961, issued on Apr 27, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Marianne Riordan, MD located?
The NPPES record lists a practice address at 3401 N Broad St, Philadelphia, PA, 19140. Phone: (215) 707-4600. Providers update this record themselves, so call before visiting.
How can I verify Marianne Riordan, MD's license?
NPPES lists Pennsylvania license number MD490718, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marianne Riordan, MD prescribe under Medicare Part D?
In 2024, Marianne Riordan, MD had 117 Medicare Part D claims for 43 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.