Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William John Ference, O.D.

Optometrist in Montville, NJ · enumerated 2007.

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

National Provider Identifier

1316165368

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Registry record

Entity type Individual (Type 1)

Name Dr. William John Ference

Credential O.D.

Sex Male

Practice address 170 Changebridge Rd, B-5, Montville, NJ, 07045

Phone (973) 835-7000

Fax (973) 835-7079

Enumeration date Apr 23, 2007

Last updated in NPPES Nov 10, 2021

Taxonomy & licenses

152WC0802X Corneal and Contact Management Optometrist Eye and Vision Services Providers · License 27OA00539800 (NJ) Secondary

152WP0200X Pediatric Optometrist Eye and Vision Services Providers · License 27OA00539800 (NJ) Secondary

152WS0006X Sports Vision Optometrist Eye and Vision Services Providers · License 27OA00539800 (NJ) Secondary

152WV0400X Vision Therapy Optometrist Eye and Vision Services Providers · License 27OA00539800 (NJ) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License 27OA00539800 (NJ) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

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

What specialty is William Ference?

William Ference is registered in NPPES with the primary taxonomy of Optometrist. 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 2021-11-10.