Siobhan Flaherty, NP
NPI 1851974497 · Family Nurse Practitioner · Boston, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Siobhan Flaherty, NP is a Family Nurse Practitioner provider in Boston, MA (NPI 1851974497).
Provider details
- NPI number
- 1851974497
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 2021015126 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 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
1,633 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 244 | $9 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 177 | $13 |
| Blood Test, Basic Group of Blood Chemicals (calcium, Total)80048 | 173 | $8 |
| Hemoglobin A1c Level83036 | 168 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 132 | $81 |
| Blood Test, Thyroid Stimulating Hormone (tsh)84443 | 124 | $16 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 135 | 45 |
| Atorvastatin Calcium | 126 | 50 |
| Lisinopril | 125 | 46 |
| Simvastatin | 115 | 41 |
| Amlodipine Besylate | 106 | 33 |
| Hydrochlorothiazide | 73 | 27 |
| Losartan Potassium | 69 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-05-02
- Last updated
- 2021-05-02
- Certified
- 2021-05-02
Frequently asked questions
- What is Siobhan Flaherty's NPI number?
- Siobhan Flaherty's National Provider Identifier (NPI) is 1851974497, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Siobhan Flaherty's specialty?
- Siobhan Flaherty is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Siobhan Flaherty located?
- Siobhan Flaherty's practice location on file with NPPES is 330 Brookline Ave, Boston, MA 02215-5491.
- What is Siobhan Flaherty's phone number?
- The practice phone number listed in the NPPES registry for Siobhan Flaherty is (617) 667-3874.
- Does Siobhan Flaherty accept Medicare?
- Siobhan Flaherty is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Siobhan Flaherty's NPI active?
- Yes — Siobhan Flaherty's NPI (1851974497) is active in the NPPES registry as of the last update on 2021-05-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.