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

Dr. Santiago Wer Arrivillaga, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1083049282

Dr. Santiago Wer Arrivillaga, MD practises Internal Medicine in Cedar Knolls, New Jersey. Qualified in 2009, 17 years ago. Practices with Summit Medical Group PA, a 1,205-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New Jersey.

Years since qualifying
17
Licensed in
NJ
In the registry since
2013
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Cedar Knolls, NJ

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 25MA09989100 (NJ)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1083049282
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 6, 2013
Last updated in NPPESSeptember 29, 2022
Certification dateSeptember 29, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Summit Medical Group Pa — 1205 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients247
Services billed 1,176 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Summit Medical Group PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1205 clinicians in the practice; 12 are shown here.

Other providers in Cedar Knolls