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

John Sos, M.D.

Prescribing (Medical) Psychologist in Belmont, MA · enumerated 2007.

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

National Provider Identifier

1780884676

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Registry record

Entity type Individual (Type 1)

Name John Sos

Credential M.D.

Sex Male

Practice address Belmont, MA, 02478

Phone (617) 484-7847

Enumeration date Jul 19, 2007

Last updated in NPPES Mar 7, 2023

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

Taxonomy & licenses

103TP0016X Prescribing (Medical) Psychologist Behavioral Health & Social Service Providers · License 37735 (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
2039826	Medicaid	MA	-
B11535	Other	-	BLUE CROSS & BLUE SHIELD

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 John Sos's NPI record?

Cross-check NPI 1780884676 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1780884676 active?

Yes, as of the latest NPPES snapshot, NPI 1780884676 is active (record last updated 2023-03-07).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.