NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John J Guerin, M.D.

Cardiovascular Disease Physician in Falmouth, MA · enumerated 2006.

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

National Provider Identifier

1740391432

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name John J Guerin
Credential M.D.
Sex Male
Practice address 90 Ter Heun Dr, Suite 300, Falmouth, MA, 02540
Phone (508) 540-0604
Fax (508) 457-0129
Enumeration date Aug 31, 2006
Last updated in NPPES Mar 18, 2009

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 79325 (MA) Primary
207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License 79325 (MA) Secondary
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
0023510 Other MA NEIGHBORHOOD HEALTH PLAN
2275959 Other MA AETNA
754160 Other MA TUFTS
B20485702 Other MA CIGNA
1740391432 Other MA UNICARE
000000029667 Other MA BOSTON MEDICAL CENTER
060058511 Other MA MEDICARE ID
11545132 Other - CAQH
1740391432 Other MA NETWORK HEALTH
3942 Other MA HARVARD PILGRIM
J14511 Other MA BLUE CROSS BLUE SHIELD
060058511 Other MA TRICARE
1740391432 Other MA GREAT WEST HEALTHCARE
25-00648 Other MA UNITED HEALTHCARE
3123324 Medicaid 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 is the NPI number for John Guerin?
The National Provider Identifier (NPI) for John Guerin is 1740391432, a Type 1 (individual) record in the CMS NPPES registry.
Where does John Guerin practice?
The practice location on file with NPPES is in Falmouth, MA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-03-18.