Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Timothy Michael Heyden, M.D.

Internal Medicine Physician in Williamsville, NY · enumerated 2006 · practices at Diane Flanigen MD Eye Care PC.

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

National Provider Identifier

1427012467

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Registry record

Entity type Individual (Type 1)

Name Dr. Timothy Michael Heyden

Credential M.D.

Sex Male

Practice address 1835 Maple Rd, Williamsville, NY, 14221

Phone (716) 634-1908

Fax (716) 634-0430

Enumeration date Apr 14, 2006

Last updated in NPPES Jan 21, 2010

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 196974 (NY) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 196974 (NY) 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
196974	Other	NY	NEW YORK LICENSE NUMBER
01616191	Medicaid	NY	-

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 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.

What specialty is Timothy Heyden?

Timothy Heyden is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Eric Thierman Internal Medicine Physician · Williamsville, NY NPI 1235101908 Susan Erk Obstetrics & Gynecology Physician · Williamsville, NY NPI 1477520203 Mariana Rizzo Obstetrics & Gynecology Nurse Practitioner · Williamsville, NY NPI 1003883851 Dawn Hrab Pediatrics Physician · Williamsville, NY NPI 1003870056 William Hartrich Internal Medicine Physician · Williamsville, NY NPI 1629026703 Mary Ellen Hartrich Registered Dietitian · Amherst, NY NPI 1487798229 Diane Flanigen MD Eye Care PC Ophthalmology Physician · Williamsville, NY NPI 1215105101 Nicole Riedy Internal Medicine Physician · Williamsville, NY NPI 1730410762

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-21.