Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Edward Clack, MD
Dermatology Physician in Elmira, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1053490805
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Registry record
Entity type Individual (Type 1)
Name Dr. William Edward Clack
Credential MD
Sex Male
Practice address 200 Madison Ave Ste 2b, Elmira, NY, 14901
Phone (607) 732-1310
Fax (607) 733-0940
Enumeration date Nov 3, 2006
Last updated in NPPES Nov 24, 2020
Taxonomy & licenses
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 |
|---|---|---|---|
| 00359366 | 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.
Frequently asked questions
Is NPI 1053490805 active?
Yes, as of the latest NPPES snapshot, NPI 1053490805 is active (record last updated 2020-11-24).
How do I verify William Clack's NPI record?
Cross-check NPI 1053490805 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Donald Foster Family Medicine Physician · Elmira, NY NPI 1679960066 Lewis Cabibi Family Medicine Physician · Elmira, NY NPI 1073968756 Keith Williams Psychiatric/Mental Health Nurse Practitioner · Elmira, NY NPI 1649701533 Britnee Monticello Student in an Organized Health Care Education/Training Program · Elmira, NY NPI 1568105708 Khizran Agha Student in an Organized Health Care Education/Training Program · Elmira, NY NPI 1053107482
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-24.