Quick answers
- Does Michael J. Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Brennan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Michael J. Brennan see?
- In 2024, CMS data shows 93 Original Medicare patients and 454 services for Michael J. Brennan. This counts Original Medicare only and measures volume, not quality.
- What is Michael J. Brennan's NPI number?
- 1538117049. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Michael J. Brennan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 93 |
|---|---|
| Services billed to Medicare | 454 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)358 services
- Testing for presence of drug, read by direct observation (80305)63 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- Arthritis70%
- High blood pressure67%
- High cholesterol67%
- Anxiety38%
- Depression30%
- COPD26%
Practice locations
Addresses where Michael J. Brennan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1931 Black Rock TpkeFairfield, CT 06825 (203) 384‑8681
- 305 Black Rock TpkeFairfield, CT 06825 (203) 337‑2600
- 760 River RdShelton, CT 06484 (203) 337‑2600
Group practices
Medicare enrollment lists Michael J. Brennan as a member of these groups (CMS data updated October 2, 2026).
- Rehabilitation Associates Inc529 clinicians in the group
- Orthopaedic Specialty Group PC60 clinicians in the group
Specialties
Find other Physical Medicine and Rehabilitation doctors in Connecticut →
Other rehabilitation doctors in Fairfield
Clinicians with the same Medicare primary specialty in Fairfield, CT — not a recommendation.
Other clinicians in Rehabilitation Associates Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538117049 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians