Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

George A. Tjionas, MD

Clinical Pathology Physician in Worcester, MA · enumerated 2013.

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

National Provider Identifier

1982946307

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Registry record

Entity type Individual (Type 1)

Name George A. Tjionas

Credential MD

Sex Male

Practice address 55 Lake Ave N, Worcester, MA, 01655

Phone (508) 793-6100

Fax (508) 793-6110

Enumeration date Mar 24, 2013

Last updated in NPPES Mar 26, 2021

Taxonomy & licenses

207ZC0006X Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 273014 (MA) 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
110130297A	Medicaid	MA	-

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 NPI 1982946307 active?

Yes, as of the latest NPPES snapshot, NPI 1982946307 is active (record last updated 2021-03-26).

How do I verify George Tjionas's NPI record?

Cross-check NPI 1982946307 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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James Liebmann Medical Oncology Physician · Worcester, MA NPI 1477556587 Daniel Han Radiation Oncology Physician · Worcester, MA NPI 1831192301 Frances Lagana Podiatrist · Worcester, MA NPI 1750385514 Seth Arum Endocrinology, Diabetes & Metabolism Physician · Worcester, MA NPI 1679578793 Yong Zhao Blood Banking & Transfusion Medicine Physician · Worcester, MA NPI 1366448813 Donna Russell Certified Registered Nurse Anesthetist · Worcester, MA NPI 1689672347 Bruce Simon Surgical Critical Care Physician · Worcester, MA NPI 1164420634 Richard Haas Endocrinology, Diabetes & Metabolism Physician · Worcester, MA NPI 1023017373

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-26.