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

William D. Trainor, M.D.

Pulmonary Disease Physician in Chestertown, MD · enumerated 2005 · practices at Internal Medicine Associates LLC.

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

National Provider Identifier

1134123771

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Registry record

Entity type Individual (Type 1)

Name William D. Trainor

Credential M.D.

Sex Male

Practice address Chestertown, MD, 21620

Phone (410) 778-0200

Fax (410) 778-6647

Enumeration date Jun 10, 2005

Last updated in NPPES Sep 11, 2008

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

Taxonomy & licenses

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License D0026789 (MD) 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
400993200	Medicaid	MD	-

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 William Trainor practice?

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

What is the NPI number for William Trainor?

The National Provider Identifier (NPI) for William Trainor is 1134123771, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Helen Noble Internal Medicine Physician · Chestertown, MD NPI 1275537896 Michael Peimer Internal Medicine Physician · Chestertown, MD NPI 1306840939 Internal Medicine Associates LLC Internal Medicine Physician · Chestertown, MD NPI 1245306323

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-11.