Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Michael Steven Grenis, MD

Individual provider Orthopaedic Surgery Physician · NPI 1669546834

Dr. Michael Steven Grenis, MD is an Orthopedic Surgery in Princeton, New Jersey. Graduated from New York Medical College in 1984, 42 years ago. Practices with Phoenix Rehabilitation and Health Services Inc, a 2,720-clinician group and accepts Medicare assignment. Licensed in New Jersey and Pennsylvania.

Years since qualifying
42
Trained at
New York Medical College
Licensed in
NJ, PA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

325 Princeton Ave
Princeton, NJ 08540-1617
Phone: (609) 924-8131
Fax: (609) 924-8532
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence 25MA05473100 (NJ)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence MD442362 (PA)

Record details

NPI number1669546834
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 20, 2006
Last updated in NPPESSeptember 30, 2019
Mailing address325 Princeton Ave, Princeton, NJ 08540-1617

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1984 (42 years in practice)
Group practice Phoenix Rehabilitation And Health Services Inc — 2720 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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