Margaret Flynn, MD
NPI 1821094491 · Endocrinology, Diabetes & Metabolism Physician · Nashua, NH
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Flynn, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Nashua, NH (NPI 1821094491).
Provider details
- NPI number
- 1821094491
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 9887 (NH)
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 tenure28% of score
21 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
889 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 525 | $95 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 243 | $34 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 59 | $65 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 28 | $134 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 21 | $131 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 72 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 710 | 170 |
| Semaglutidebrand: Ozempic | 316 | 78 |
| Tirzepatidebrand: Mounjaro | 263 | 62 |
| Rosuvastatin Calcium | 263 | 70 |
| Empagliflozinbrand: Jardiance | 212 | 52 |
| Insulin Pump Cart,auto,bt,g6/7brand: Omnipod 5 Dexg7g6 Pods (gen 5) | 168 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-28
- Last updated
- 2022-07-19
- Certified
- 2022-07-19
Frequently asked questions
- What is Margaret Flynn's NPI number?
- Margaret Flynn's National Provider Identifier (NPI) is 1821094491, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Flynn's specialty?
- Margaret Flynn is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Flynn located?
- Margaret Flynn's practice location on file with NPPES is 166 Kinsley St Ste 101, Nashua, NH 03060-3676.
- What is Margaret Flynn's phone number?
- The practice phone number listed in the NPPES registry for Margaret Flynn is (603) 881-7141.
- Does Margaret Flynn accept Medicare?
- Margaret Flynn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Flynn's NPI active?
- Yes — Margaret Flynn's NPI (1821094491) is active in the NPPES registry as of the last update on 2022-07-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.