Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Merlin Gerst, PT

Individual provider Physical Therapist · NPI 1295718658

Merlin Gerst, PT is registered under Physical Therapist in Private Practice in Waltham, Massachusetts. Qualified in 2002, 24 years ago. Practices with Fox Rehab MA LLC, an 18-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
24
Licensed in
MA
In the registry since
2005
What do these letters mean?
PT — Physical Therapist
A licensed therapist who treats movement, pain and injury.

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Practice location Address checks out

840 Winter St
Waltham, MA 02451
Phone: (781) 487-9944
Fax: (781) 487-9966
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physical Therapist (primary) Taxonomy 225100000X · Licence 16129 (MA)

Record details

NPI number1295718658
Entity typeIndividual (Type 1)
GenderMale
Credentials PT
Sole proprietorNo
NPI enumeratedNovember 21, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICAL THERAPIST IN PRIVATE PRACTICE
Medical schoolOTHER
Graduated 2002 (24 years in practice)
Group practice Fox Rehab Ma Llc — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients74
Services billed 4,458 a service is one billed item, such as a visit, a test or a procedure
Average patient age84

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Fox Rehab MA LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 18 clinicians in the practice; 12 are shown here.

Other providers in Waltham