Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Charles Stephen Foster, M.D.

Ophthalmology Physician in Waltham, MA · enumerated 2005 · practices at Massachusetts Eye Research and Surgery Institution, PC.

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

National Provider Identifier

1285617530

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Registry record

Entity type Individual (Type 1)

Name Dr. Charles Stephen Foster

Credential M.D.

Sex Male

Practice address Waltham, MA, 02451

Phone (781) 891-6377

Fax (617) 494-1430

Enumeration date Nov 21, 2005

Last updated in NPPES May 8, 2015

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 37755 (MA) 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
2030667	Medicaid	MA	-
703385	Other	MA	TUFTS HEALTH PLAN
M08846	Other	MA	BCBS 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Charles Foster?

Charles Foster is registered in NPPES with the primary taxonomy of Ophthalmology Physician. 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.

Other providers at this practice address

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Juan Mallari Anesthesiology Physician · Waltham, MA NPI 1508834854 Massachusetts Eye Research and Surgery Institution, PC Ophthalmology Physician · Waltham, MA NPI 1639230527 Stephen Anesi Ophthalmology Physician · Waltham, MA NPI 1003052788

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-05-08.