Marianne Riordan, MD
NPI 1649891961 · Endocrinology, Diabetes & Metabolism Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marianne Riordan, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Philadelphia, PA (NPI 1649891961).
Provider details
- NPI number
- 1649891961
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- MD490718 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Levothyroxine Sodium | 18 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-27
- Last updated
- 2026-01-30
- Certified
- 2026-01-30
Frequently asked questions
- What is Marianne Riordan's NPI number?
- Marianne Riordan's National Provider Identifier (NPI) is 1649891961, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marianne Riordan's specialty?
- Marianne Riordan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Marianne Riordan located?
- Marianne Riordan's practice location on file with NPPES is 3401 N Broad St, Philadelphia, PA 19140-5103.
- What is Marianne Riordan's phone number?
- The practice phone number listed in the NPPES registry for Marianne Riordan is (215) 707-4600.
- Does Marianne Riordan accept Medicare?
- Marianne Riordan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marianne Riordan's NPI active?
- Yes — Marianne Riordan's NPI (1649891961) is active in the NPPES registry as of the last update on 2026-01-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.