Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Santiago Wer Arrivillaga, MD

Internal Medicine Physician in Cedar Knolls, NJ · enumerated 2013.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1083049282

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Registry record

Entity type Individual (Type 1)

Name Dr. Santiago Wer Arrivillaga

Credential MD

Sex Male

Practice address 160 E Hanover Ave, Cedar Knolls, NJ, 07927

Phone (973) 605-5090

Fax (973) 605-1705

Enumeration date Sep 6, 2013

Last updated in NPPES Sep 29, 2022

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 25MA09989100 (NJ) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
25MA09989100	Other	NJ	NJBME

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Santiago Wer Arrivillaga?

The National Provider Identifier (NPI) for Santiago Wer Arrivillaga is 1083049282, a Type 1 (individual) record in the CMS NPPES registry.

Where does Santiago Wer Arrivillaga practice?

The practice location on file with NPPES is in Cedar Knolls, NJ. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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James Kuchera Obstetrics & Gynecology Physician · Cedar Knolls, NJ NPI 1356454813 Sarah Potash Obstetrics & Gynecology Physician · Cedar Knolls, NJ NPI 1003920216 Michael Kuchera Obstetrics & Gynecology Physician · Cedar Knolls, NJ NPI 1215041348 James J Kuchera M.D. P.A. Obstetrics & Gynecology Physician · Cedar Knolls, NJ NPI 1376657437 Paul Siegel General Practice Dentistry · Cedar Knolls, NJ NPI 1164538641 Paul M Siegel, Dmd, PA General Practice Dentistry · Cedar Knolls, NJ NPI 1164538658 Michael Siegel General Practice Dentistry · Cedar Knolls, NJ NPI 1730371055 Michael S Siegel DDS PC Dentist · Cedar Knolls, NJ NPI 1891957486

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-29.