Dr. Michael S. Grenis, MD | Plainsboro, NJ | Orthopedic Surgeon

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Dr. Michael Grenis is a board-certified orthopedic surgeon who specializes in orthopedic surgery, hand surgery, and plastic surgery. He earned his medical degree from New York Medical College and completed his residency at New York University. With 42 years of experience in practice, Dr. Grenis has developed extensive expertise in treating complex musculoskeletal conditions and injuries. He is fluent in both English and Spanish.

Dr. Grenis is affiliated with Lehigh Valley Hospital Pocono and practices at multiple locations throughout New Jersey, including Plainsboro, Jamesburg, Ewing, Princeton, and Robbinsville. He treats patients with joint pain, wrist fractures, and arm fractures. His approach to care includes physical therapy, strength training, and manual therapy to help patients recover and regain function. Patients consistently rate their experience with Dr. Grenis highly, giving him an average rating of 4.9.

Overview based on verified provider data

accepting new patients
4.8

82 Ratings
42 years of experience
speaks English, Spanish
New York University
71 written reviews
3 specialties
18 areas of expertise
3 board certifications
1 hospital affiliation
9 office locations
Male

Gave an accurate diagnosis
Had a good bedside manner
Spent time with me

Based on patient feedback. Read the reviews

Dr. Grenis' Ratings and Reviews

4.8

82 Ratings with 71 written Reviews

Average Wait Time 11 Minutes

How was your appointment with
Dr. Grenis?

Patients’ Perspective

Gave an accurate diagnosis: (62) Did WellNeeds Improvement (1)
Had a good bedside manner: (61) Did WellNeeds Improvement (2)
Spent time with me: (61) Did WellNeeds Improvement (2)
Provided follow-up after the visit: (50) Did WellNeeds Improvement (1)
Flexible scheduling: (45) Did WellNeeds Improvement (0)
Saw me in a timely manner: (2) Did WellNeeds Improvement (0)
Staff was courteous: (1) Did WellNeeds Improvement (0)

Patients frequently describe Dr. Michael Steven Grenis as professional, knowledgeable, and kind, with many appreciating his thorough explanations, attentive listening, and ability to make medical procedures stress-free. They often highlight his expertise in surgeries and positive bedside manner, along with friendly and efficient office staff. However, some patients have expressed dissatisfaction with his communication skills, mentioning incidents where he appeared dismissive or inattentive, with one noting an error in a medical report. Despite this, the majority of experiences shared were positive, with recommendations for others to seek his care.

AI-generated from the text of patient reviews

82 ratings & reviews

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Showing 1 to 10 of 71 reviews

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Dr Grenis was dismissive and defensive over the risks and benefits of having my son use a waterproof cast vs a traditional cast. On top of that in his report, he wrote my son broke his right arm, when it was his left. I got better treatment for my own arm break at Rothman. This was disappointing experience.

May 22nd, 2026

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Attentive, professional, addresses all concerns, takes all the time needed to discuss concerns

April 15th, 2026

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Very helpful visit. Very informative

March 26th, 2026

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Dr. Grenis was very easy to talk to and he explained everything in terms that were easy to understand.

January 28th, 2026

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Upon entering practice, the office staff was very nice and attentive. This is my second visit with Dr. Grenis which was very different from my first visit; was very happy and had a very positive experience with both the doctor and assistant. Dr. Grenis showed to be positive and genuine

November 26th, 2025

1 person found this helpful

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Dr Grenis answered all of my questions thoroughly. He explained a procedure that I enquired about in a way that I could understand. Besides all of that he is a very nice man and I would highly recommend him.

November 24th, 2025

1 person found this helpful

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Very professional. He is a sweetheart.i would highly recommend him.

September 22nd, 2025

1 person found this helpful

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Staff all courteous and friendly, visit was timely, Dr Grenis very professional, kind and knowledgeable, would recommend to anyone

September 19th, 2025

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Dr Grenis is a caring and wonderful doctor. I am very happy that he was the one to operate on my elbow.

August 22nd, 2025

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Dr Grenis provided excellent care at my first visit with him for a broken hand. Dr Grenis was very thorough and he took his time to listen to me and my concerns. His assistant and X-ray tech were also super nice. I would highly recommend Dr Grenis to friends and family. I had an overall great experience!

August 14th, 2025

Princeton Orthopaedic Associates Pa

5 Plainsboro Rd Ste 490Plainsboro, NJ 08536

Tel: (609) 924-8131

Mon8:00 am - 5:00 pm

Tue8:00 am - 5:00 pm

Wed8:00 am - 5:00 pm

Thu8:00 am - 5:00 pm

Fri8:00 am - 5:00 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

11 Centre DrJamesburg, NJ 08831

Tel: (609) 924-8131

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

340 Scotch RdEwing, NJ 08628

Tel: (609) 924-8131

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed

Penn Medicine Princeton Medical Center

1 Plainsboro RdPlainsboro, NJ 08536

Tel: (609) 497-4000

Surgical Specialists At Princeton

136 Main St Ste 100Princeton, NJ 08540

Tel: (609) 799-1130

Mon6:00 am - 5:30 pm

Tue6:00 am - 5:30 pm

Wed6:00 am - 5:30 pm

Thu6:00 am - 5:30 pm

Fri6:00 am - 5:30 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

5 Plainsboro Rd Ste 100Plainsboro, NJ 08536

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

200 CHARLES EWING BLVD STE 170EWING, NJ 08628

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

727 State RdPrinceton, NJ 08540

Tel: (609) 924-8131

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed

Princeton Orthopaedic Associates Pa

1 UNION ST STE 305ROBBINSVILLE, NJ 08691

Mon8:00 am - 4:30 pm

Tue8:00 am - 4:30 pm

Wed8:00 am - 4:30 pm

Thu8:00 am - 4:30 pm

Fri8:00 am - 4:30 pm

SatClosed

SunClosed


Dr. Michael Steven Grenis, MD	Dr. James M. Scott, DO	Dr. Karan Dua, MD	Devon Mazzanti, PA-C
Orthopedic Surgery	Orthopedic Surgery	Orthopedic Surgery	Orthopedic Surgery
Accepts New Patients	Accepts New Patients	Accepts New Patients	Accepts New Patients
4.8 (82 Ratings)	0 (0 Ratings)	0 (0 Ratings)	0 (0 Ratings)
42 Years of Experience		11 Years of Experience
No Virtual Visit Option	No Virtual Visit Option	Virtual Visit Available	No Virtual Visit Option
Speaks English, Spanish	Speaks English
Plainsboro , NJ	Langhorne , PA	New York , NY	Langhorne , PA
Med School: New York Medical College	Med School: New York Institute of Technology College of Osteopathic Medicine	Med School: Renaissance School Of Medicine At Stony Brook University
Current Profile	View Profile	View Profile	View Profile

Search for your insurance and plan

Accepts Medicare
Accepts Medicaid

Arthroscopy
Bone Fracture
Carpal Tunnel Syndrome
Dupuytren's Contracture
Hand Injuries
Hand Surgery
Herniated Disc
Hip Osteoarthritis
Hip Surgery
Joint Pain/Swelling
Joint Replacement
Laminectomy
Osteoarthritis
Osteoarthritis (Hand and Wrist)
Plastic Surgery
Scoliosis
Sports Medicine
Surgery

MEDICAL LICENSE

Medical Doctor, New Jersey, 2027, Active

EDUCATION & TRAINING

Residency

New York University

Medical School

New York Medical CollegeGraduated in 1984

Dr. Robert Vincent Vitolo, MD
Plastic Surgery
56 Years Exp | Staten Island, NY
(32)
Dr. Martin Elliot Kessler, MD
Plastic Surgery
46 Years Exp | Massapequa, NY
(65)
Dr. Jan Czerepak, DO
Plastic Surgery
| Trenton, NJ
(0)
Dr. Michael Joseph Mclaughlin, MD
Plastic Surgery
| Pennington, NJ
(0)
Dr. Robin Tiffany Wu
Plastic Surgery
7 Years Exp | Millington, NJ
(0)
Dr. Abdul Rehman Arain
Orthopedic Spine Surgery
10 Years Exp | Wayne, NJ
(0)
Dr. Edwin M Mercado
Sports Medicine
39 Years Exp | Bridgewater, NJ
(0)
Dr. Emily Ann Vankouwenbe
Hand Surgery
14 Years Exp | New Brunswick, NJ
(0)
Dr. Gregory Anthony Parker
Sports Medicine
9 Years Exp | Tinton Falls, NJ
(0)
Dr. Andriy Ilashuk
Nurse Practitioner
| Jersey City, NJ
(0)

Does Dr. Michael Grenis accept virtual/telehealth appointments?: Dr. Michael Grenis has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
What languages does Dr. Michael Grenis speak?: Dr. Michael Grenis speaks English and Spanish.
Where is Dr. Michael Grenis's office located?: Dr. Michael Grenis's office is located at 5 Plainsboro Rd Ste 490, Plainsboro, NJ, 08536.
Which hospitals is Dr. Michael Grenis affiliated with?: Dr. Michael Grenis is affiliated with Lehigh Valley Hospital Pocono.
Does Dr. Michael Grenis accept my insurance?: You can see the insurance plans that Dr. Michael Grenis accepts on their Vitals profile.

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