Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Dean Haselhuhn, M.D.

Specialist in Toledo, OH · enumerated 2005.

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

National Provider Identifier

1538145560

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Dean Haselhuhn

Credential M.D.

Sex Male

Practice address 2000 Regency Ct, Suite 200, Toledo, OH, 43623

Phone (419) 725-1900

Fax (419) 725-1905

Enumeration date Dec 21, 2005

Last updated in NPPES Jan 5, 2022

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 35068258 (OH) 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
0186276	Medicaid	OH	-

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

What specialty is Gregory Haselhuhn?

Gregory Haselhuhn is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-05.