NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Douglas L. Dier, M.D., P.C

Rheumatology Physician in Rutland, VT · enumerated 2010 · authorized official Douglas Dier, Owner.

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

National Provider Identifier

1275845943

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Douglas L. Dier, M.D., P.C
Practice address 98 Allen St, Rutland, VT, 05701
Phone (802) 775-3374
Enumeration date Jul 9, 2010
Last updated in NPPES Apr 22, 2020

Taxonomy & classification

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 042-0007797 (VT) Primary

Authorized official

Name Douglas Dier
Title Owner
Phone (802) 775-3374

Other identifiers

Identifier Type State Issuer
1018191 Medicaid VT -

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 type of organization is Douglas L. Dier, M.D., P.C?
Douglas L. Dier, M.D., P.C is registered in NPPES as a Rheumatology Physician (its primary provider taxonomy).
What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-22.