Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Eric Marcus Orenstein, M.D.

Orthopaedic Surgery Physician in Lafayette, IN · enumerated 2005 · practices at Arnett Clinic, LLC.

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

National Provider Identifier

1174524839

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Registry record

Entity type Individual (Type 1)

Name Eric Marcus Orenstein

Credential M.D.

Sex Male

Practice address 2600 Ferry St, Lafayette, IN, 47904

Phone (765) 448-8000

Fax (765) 448-7613

Enumeration date Aug 3, 2005

Last updated in NPPES Feb 3, 2021

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License EO073282 (MI) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 01062952A (IN) 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
000000507619	Other	IN	ANTHEM PROVIDER NUMBER
103503999	Medicaid	MI	-
200140760	Medicaid	IN	-
9245965	Other	IN	PHCS PID NUMBER

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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Eric Orenstein?

Eric Orenstein is registered in NPPES with the primary taxonomy of Orthopaedic Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-03.