Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron T Gries, MD

Q: What is the NPI number for Aaron Gries?

The National Provider Identifier (NPI) for Aaron Gries is 1255377321, a Type 1 (individual) record in the CMS NPPES registry.

Anesthesiology Physician in Evansville, IN · enumerated 2006.

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

National Provider Identifier

1255377321

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Registry record

Entity type Individual (Type 1)

Name Aaron T Gries

Credential MD

Sex Male

Practice address 3700 Washington Ave, St Marys Medical Center Anesthesia Dept, Evansville, IN, 47750

Phone (812) 485-4000

Enumeration date Jun 20, 2006

Last updated in NPPES May 26, 2011

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 01056077A (IN) Primary

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License 01056077A (IN) 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
200444590	Medicaid	IN	-
64071772	Medicaid	KY	-
000000283867	Other	IN	BLUE SHIELD
P00036246	Other	-	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Aaron Gries practice?

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

What is the NPI number for Aaron Gries?

The National Provider Identifier (NPI) for Aaron Gries is 1255377321, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-05-26.