Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William S Holt, M.D.

Ophthalmology Physician in Portland, ME · enumerated 2006.

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

National Provider Identifier

1710914163

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William S Holt

Credential M.D.

Sex Male

Practice address 53 Sewall St, Portland, ME, 04102

Phone (207) 828-2020

Fax (207) 773-7034

Enumeration date Jun 28, 2006

Last updated in NPPES Dec 28, 2009

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 007905 (ME) Primary

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
1042047	Other	ME	AETNA
000431	Other	ME	ANTHEM BCBS
244430099	Medicaid	ME	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1710914163 active?

Yes, as of the latest NPPES snapshot, NPI 1710914163 is active (record last updated 2009-12-28).

How do I verify William Holt's NPI record?

Cross-check NPI 1710914163 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 →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-12-28.