NPPES file of Aug 9, 2026

Santiago Wer Arrivillaga, MD

Internal Medicine Physician · Cedar Knolls, NJ

Santiago Wer Arrivillaga, MD is an internal medicine physician with a practice address in Cedar Knolls, New Jersey, and NPI 1083049282, issued on Sep 6, 2013. Check the license (New Jersey 25MA09989100, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1083049282
Name
Santiago Wer Arrivillaga
Credential
MD
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
25MA09989100 NJ
Self-reported in NPPES; status is on the state search
Practice location
160 E Hanover Ave, Cedar Knolls, NJ 07927
Phone
(973) 605-5090
Enumerated
Sep 6, 2013
Record last updated
Sep 29, 2022
Fax
(973) 605-1705
Medicare enrollment
Enrolled (PECOS I20171101001925); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →

Also registered at 160 E Hanover Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Mary Chu, M.D.Obstetrics & Gynecology Physician1801025556
  2. Christopher Halloran, DPTPhysical Therapist1801279690
  3. James Kuchera, M.D.Obstetrics & Gynecology Physician1356454813
  4. Michael Kuchera, M.D.Obstetrics & Gynecology Physician1215041348
  5. Samantha Menza, DPTPhysical Therapist1215453634
  6. Roshni Patel, D.O.Obstetrics & Gynecology Physician1932529260

Verify Santiago Wer Arrivillaga in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
    Search for license 25MA09989100    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New Jersey license search

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43% fewer Medicare Part D claims than the average internal medicine physician in 2024

1,811 Medicare Part D claims for 250 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 12 claims were for opioids.

  1. Santiago Wer Arrivillaga1,811
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium180 claims
  2. Amlodipine Besylate137 claims
  3. Levothyroxine Sodium71 claims
  4. Rosuvastatin Calcium63 claims
  5. Lisinopril57 claims
  6. Losartan Potassium49 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through one group practice

  1. Summit Medical Group PABerkeley Heights, NJ

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Santiago Wer Arrivillaga among 4,632 internal medicine physician records in New Jersey

Santiago Wer Arrivillaga, MD is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 72% of them.

  • NPI issued2013 · 72% of these records are older, 26% newer
  • In a Medicare fileYes · 82% of these records are
  • In the CMS Doctors and Clinicians fileYes · 68% of these records are
  • Graduated2009 · median 2000 among the 3,132 with a school on file
  • Record last updated2022 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Internal Medicine Physician providers in New Jersey

There are 4,632 internal medicine physician records in New Jersey.

All 4,632 in New Jersey → Every provider in Cedar Knolls → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Robert Farrell, MDCedar Knolls, NJ 079271003503996
  2. Kenneth Storch, M.D., PH.D.Cedar Knolls, NJ 079271841285954
  3. Neal Collins, MDChatham, NJ 079281225578362
  4. James Depasquale, M.D.Chatham, NJ 079281699931410
  5. Robert Freda, M.D.Chatham, NJ 079281104071208
  6. Susan Lee, M.D.Chatham, NJ 079281669695623
  7. Rajiv Patni, M.D.Chatham, NJ 079281861685109
  8. Allen Traficante, M.D.Chatham, NJ 079281023254539

Common questions

What is Santiago Wer Arrivillaga, MD's NPI number?

Santiago Wer Arrivillaga, MD's National Provider Identifier (NPI) is 1083049282, issued on Sep 6, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Santiago Wer Arrivillaga, MD located?

The NPPES record lists a practice address at 160 E Hanover Ave, Cedar Knolls, NJ, 07927. Phone: (973) 605-5090. Providers update this record themselves, so call before visiting.

How can I verify Santiago Wer Arrivillaga, MD's license?

NPPES lists New Jersey license number 25MA09989100, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Santiago Wer Arrivillaga, MD prescribe under Medicare Part D?

In 2024, Santiago Wer Arrivillaga, MD had 1,811 Medicare Part D claims for 250 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.