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Edit this profileAt a glance
- 325 Princeton Ave, Princeton, NJ 08540
About Dr. Grenis
Michael S. Grenis, MD is a healthcare provider in Princeton, NJ specializing in orthopedic surgery. Michael trained at New York Medical College, graduating in 1984. Michael is also listed as specializing in orthopaedic surgery. According to Medicare claims data, Michael cared for 2,026 Medicare patients across 10,758 services. The services billed most often include injection, methylprednisolone acetate, 1 mg, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more. This provider record is associated with NPI 1669546834.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (609) 924-8131
- Email not available
Practice Locations
325 PRINCETON AVE
Princeton, NJ 08540
Conditions Commonly Evaluated or Treated
Within Orthopedic Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Elbow, hand, and wrist
Foot and ankle
Hip
Shoulder
Sports and soft tissue
Trauma and bone
Foot & Ankle
Spine
Procedures & services
Most searched procedures
Evaluation and nonsurgical
Arthroscopy
Foot & Ankle
Foot and ankle
Hand & Wrist
Hand and upper extremity
Injections & Non-Surgical
Injections & pain relief
Joint replacement
- Partial knee replacement
- Reverse shoulder replacement
- Revision joint replacement
- Shoulder replacement
Knee
Shoulder surgery
Trauma & Fractures
Trauma and fixation
Procedures Most Often Billed to Medicare
10,758 services · 2,026 patients · 18 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Injection into tendon or ligament | Procedure | 20550 |
226 | More than most peers in Orthopedic Surgery |
| Aspiration and/or injection of fluid from small joint | Procedure | 20600 |
102 | More than most peers in Orthopedic Surgery |
| Release and/or relocation of hand nerve | Procedure | 64721 |
37 | More often than most peers in Orthopedic Surgery |
| Injection of carpal tunnel | Procedure | 20526 |
37 | More often than most peers in Orthopedic Surgery |
| Application of elbow to finger cast | Procedure | 29075 |
29 | More often than most peers in Orthopedic Surgery |
| Aspiration and/or injection of fluid from medium joint | Procedure | 20605 |
20 | As often as other peers in Orthopedic Surgery |
| Release of tendon of palm or finger | Procedure | 26440 |
12 | Too few peers to compare |
| X-ray of hand, minimum of 3 views | Imaging | 73130 |
182 | More than most peers in Orthopedic Surgery |
| X-ray of wrist, minimum of 3 views | Imaging | 73110 |
182 | More than most peers in Orthopedic Surgery |
| X-ray of finger, minimum of 2 views | Imaging | 73140 |
96 | More than most peers in Orthopedic Surgery |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other orthopedic surgeons at this location 8
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 6
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 25 related providers in 4 groups
Trained at New York Medical College 8
Other providers in the same specialty who trained at the same institution.
Class of 1984 at New York Medical College 8
Providers who graduated from the same medical school in the same year.
Also performs Injection into tendon or ligament 8
Providers in NJ who bill this service to Medicare most often.
Common questions
What does Dr. Grenis specialize in?
Dr. Grenis is an orthopedic surgeon in Princeton, NJ. That is the designation recorded for this NPI in the federal registry, where it is listed as “Orthopedic Surgery”.
NPI registry
Where is Dr. Grenis located?
Dr. Grenis is listed at 325 Princeton Ave, Princeton, NJ 08540. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Grenis's phone number?
The number on file is (609) 924-8131. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Grenis's NPI number?
Dr. Grenis's National Provider Identifier is 1669546834. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Grenis go to medical school?
Dr. Grenis attended New York Medical College, graduating in 1984. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Grenis been practicing?
Dr. Grenis has 42 years experience. Calculated from a graduation year of 1984, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Grenis do most often?
According to Medicare billing data, Dr. Grenis performs procedures including injection into tendon or ligament, aspiration and/or injection of fluid from small joint and release and/or relocation of hand nerve; reads or performs imaging such as x-ray of hand, minimum of 3 views and x-ray of wrist, minimum of 3 views, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Grenis confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Grenis. If this is you, claiming it is free.
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