Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dan S Tilles, M.D.

Q: What is the NPI number for Dan Tilles?

The National Provider Identifier (NPI) for Dan Tilles is 1912964321, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Concord, MA · enumerated 2006.

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

National Provider Identifier

1912964321

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Registry record

Entity type Individual (Type 1)

Name Dan S Tilles

Credential M.D.

Sex Male

Practice address 86 Baker Ave Extension, Concord, MA, 01742

Phone (978) 287-9300

Fax (978) 287-9357

Enumeration date Apr 28, 2006

Last updated in NPPES May 26, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 45946 (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
0172723	Medicaid	MA	-
J07305	Other	MA	BLUE CROSS
65067	Other	MA	HARVARD PILGRIM
006170	Other	MA	NEIGHBORHOOD HEALTH
4109369	Other	MA	AETNA
715989	Other	MA	TUFTS
B10208102	Other	MA	CIGNA

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

Where does Dan Tilles practice?

The practice location on file with NPPES is in Concord, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Dan Tilles?

The National Provider Identifier (NPI) for Dan Tilles is 1912964321, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-05-26.