Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Felix Balder, D.O.

Optician in Chestnut Hill, MA · enumerated 2010 · practices at Chestnut Hill Visioncare.

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

National Provider Identifier

1285944736

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Registry record

Entity type Individual (Type 1)

Name Mr. Felix Balder

Credential D.O.

Sex Male

Practice address 199 Boylston St, Mall at Chestnut Hill, Chestnut Hill, MA, 02467

Phone (617) 969-5050

Enumeration date Oct 18, 2010

Last updated in NPPES Oct 18, 2010

Taxonomy & licenses

156FX1800X Optician Eye and Vision Services Providers · License 4015 (MA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

How do I verify Felix Balder's NPI record?

Cross-check NPI 1285944736 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1285944736 active?

Yes, as of the latest NPPES snapshot, NPI 1285944736 is active (record last updated 2010-10-18).

Other providers at this practice address

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Chestnut Hill Visioncare Optometrist · Chestnut Hill, MA NPI 1710833785

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-10-18.