Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Mark Mathien, M.D.

Sports Medicine (Orthopaedic Surgery) Physician in Knoxville, TN · enumerated 2006.

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

National Provider Identifier

1730156076

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Mark Mathien

Credential M.D.

Sex Male

Practice address 1422 Old Weisgarber Rd, Knoxville, TN, 37909

Phone (865) 558-4400

Fax (865) 558-4471

Enumeration date Mar 7, 2006

Last updated in NPPES Jan 15, 2026

Taxonomy & licenses

207XX0005X Sports Medicine (Orthopaedic Surgery) Physician Allopathic & Osteopathic Physicians · License 21414 (TN) Primary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License MD21414 (TN) 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
TN0120	Other	TN	JOHN DEERE HEALTHCARE
100010064	Other	TN	TENNCARE
1196196	Other	TN	UNITED HEALTH CARE
TN0152	Other	TN	JOHN DEERE HEALTHCARE
3059706	Medicaid	TN	-
4397728	Other	TN	AETNA
200030088	Other	TN	RAILROAD MEDICARE
3071385	Other	TN	BLUE CROSS BLUE SHIELD
098041241	Other	TN	TRICARE
P00910368	Other	TN	RAILROAD MEDICARE

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

How do I verify Gregory Mathien's NPI record?

Cross-check NPI 1730156076 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1730156076 active?

Yes, as of the latest NPPES snapshot, NPI 1730156076 is active (record last updated 2026-01-15).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-15.