Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nathan Paul Olszewski, MD

Orthopaedic Trauma Physician in Boston, MA · enumerated 2016.

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

National Provider Identifier

1376905109

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Registry record

Entity type Individual (Type 1)

Name Nathan Paul Olszewski

Credential MD

Sex Male

Practice address 725 Albany St Ste 4b, Boston, MA, 02118

Phone (617) 638-5633

Enumeration date Mar 22, 2016

Last updated in NPPES Aug 10, 2022

Taxonomy & licenses

207XX0801X Orthopaedic Trauma Physician Allopathic & Osteopathic Physicians · License MD61139365 (WA) Secondary

207XX0801X Orthopaedic Trauma Physician Allopathic & Osteopathic Physicians · License 292226 (MA) Primary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License MD61139365 (WA) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 292226 (MA) Secondary

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
1376905109	Medicaid	WA	-

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

Is NPI 1376905109 active?

Yes, as of the latest NPPES snapshot, NPI 1376905109 is active (record last updated 2022-08-10).

How do I verify Nathan Olszewski's NPI record?

Cross-check NPI 1376905109 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-10.