Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ronald J. Mastrolia Jr., O.D.
Optometrist in Fairhaven, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1275520769
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Registry record
Entity type Individual (Type 1)
Name Ronald J. Mastrolia Jr.
Credential O.D.
Sex Male
Practice address 70 Huttleston Ave, Fairhaven, MA, 02719
Phone (508) 994-2020
Fax (508) 991-6082
Enumeration date Sep 30, 2005
Last updated in NPPES Sep 21, 2022
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 |
|---|---|---|---|
| 0355933 | Medicaid | MA | - |
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 1275520769 active?
Yes, as of the latest NPPES snapshot, NPI 1275520769 is active (record last updated 2022-09-21).
How do I verify Ronald Mastrolia's NPI record?
Cross-check NPI 1275520769 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 → Fernanda Resendes Optician · Fairhaven, MA NPI 1952352197 Eye Health Vision Centers, LLC Eyewear Supplier · Fairhaven, MA NPI 1336246941 Pamela Loerinc Ophthalmology Physician · Fairhaven, MA NPI 1205160629 Eye Health Associates Inc Eyewear Supplier · Fairhaven, MA NPI 1699029892 Eye Health Associates Inc Ophthalmology Physician · Fairhaven, MA NPI 1558602771
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-21.