Michael Fitzsimons, MD
NPI 1588632848 · Anesthesiology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Fitzsimons, MD is a Anesthesiology Physician provider in Boston, MA (NPI 1588632848).
Provider details
- NPI number
- 1588632848
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 206890 (MA)
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 tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
225 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Anesthesia for Procedure to Correct Abnormal Heart Rhythm00410 | 48 | $98 |
| Anesthesia for Procedure on Heart and Large Blood Vessels00560 | 45 | $554 |
| Insertion of Probe in Esophagus for Heart Ultrasound93313 | 43 | $11 |
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 35 | $45 |
| Anesthesia for Procedure to Assess Heart Electrical Activity00537 | 28 | $264 |
| Anesthesia for Insertion of Permanent Heart Pacemaker00530 | 13 | $204 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-10
- Last updated
- 2014-09-16
Frequently asked questions
- What is Michael Fitzsimons's NPI number?
- Michael Fitzsimons's National Provider Identifier (NPI) is 1588632848, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Fitzsimons's specialty?
- Michael Fitzsimons is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Fitzsimons located?
- Michael Fitzsimons's practice location on file with NPPES is 55 Fruit Street, Boston, MA 02114-2696.
- What is Michael Fitzsimons's phone number?
- The practice phone number listed in the NPPES registry for Michael Fitzsimons is (617) 726-8808.
- Does Michael Fitzsimons accept Medicare?
- Michael Fitzsimons is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Fitzsimons's NPI active?
- Yes — Michael Fitzsimons's NPI (1588632848) is active in the NPPES registry as of the last update on 2014-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.