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

Ari Chaim Greis, DO

Individual provider Physical Medicine & Rehabilitation Physician · NPI 1831209105

Ari Chaim Greis, DO is registered under Physical Medicine and Rehabilitation in Bryn Mawr, Pennsylvania. Graduated from Philadelphia College of Osteopathic Medicine in 2003, 23 years ago. Practices with Phoenix Rehabilitation and Health Services Inc, a 2,720-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in New Jersey and Pennsylvania.

Years since qualifying
23
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
NJ, PA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

825 Old Lancaster Rd Ste 100
Bryn Mawr, PA 19010-3234
Phone: (267) 339-3558
Fax: (267) 339-3763
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 234 Mall Blvd Ste G30, King Of Prussia, PA 19406-2921 — (267) 339-3558

Specialties & licences

Physical Medicine & Rehabilitation Physician (primary) Taxonomy 208100000X · Licence OS014246 (PA)
Physical Medicine & Rehabilitation Physician Taxonomy 208100000X · Licence 25MB09081300 (NJ)

Record details

NPI number1831209105
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 30, 2006
Last updated in NPPESMay 9, 2024
Certification dateMay 9, 2024

Medicare enrollment

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

Medicare specialtyPHYSICAL MEDICINE AND REHABILITATION
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2003 (23 years in practice)
Group practice Phoenix Rehabilitation And Health Services Inc — 2720 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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 patients408
Services billed 2,462 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $41 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility and 1 long-term care hospital, which CMS identifies by certification number only.

Colleagues at Phoenix Rehabilitation and Health Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2720 clinicians in the practice; 12 are shown here.

Other providers in Bryn Mawr