Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Greg A Butterworth, O. D.
Optometrist in Havre De Grace, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336116979
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Registry record
Entity type Individual (Type 1)
Name Greg A Butterworth
Credential O. D.
Sex Male
Practice address 920 Revolution St, Havre De Grace, MD, 21078
Phone (410) 939-2200
Fax (410) 939-5980
Enumeration date Mar 2, 2006
Last updated in NPPES Nov 2, 2021
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P00376361 | Other | - | MEDICARE RAILROAD |
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 1336116979 active?
Yes, as of the latest NPPES snapshot, NPI 1336116979 is active (record last updated 2021-11-02).
How do I verify Greg Butterworth's NPI record?
Cross-check NPI 1336116979 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 → Betsy Cohen Audiologist · Havre De Grace, MD NPI 1225033533 David Heath Optometrist · Harre De Grace, MD NPI 1467429282 Jeffrey Cohen Optometrist · Havre De Grace, MD NPI 1770550071 Manqian Tu Optometrist · Havre De Grace, MD NPI 1801855630 Edward Patro Optometrist · Havre De Grace, MD NPI 1902917123 Halpern Eye Care of Maryland, Inc. Optometrist · Havre De Grace, MD NPI 1881792190 Lauren Stephens Optometrist · Havre De Grace, MD NPI 1265638316 Hearing Associates, Inc Audiologist · Havre De Grace, MD NPI 1194906040
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-02.