Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Margaret Stoner Atwell, MD

Internal Medicine Physician in Sinking Spring, PA · enumerated 2005 · practices at Yapa Apartment Living Program, Inc..

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

National Provider Identifier

1477550069

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Registry record

Entity type Individual (Type 1)

Name Dr. Margaret Stoner Atwell

Credential MD

Sex Female

Practice address 2913 Windmill Rd, Ste 7, Sinking Spring, PA, 19608

Phone (610) 678-8800

Fax (610) 678-8286

Enumeration date Jun 28, 2005

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD039463E (PA) 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
135920	Other	PA	HEALTHAMERICA ID #
01523701	Other	PA	BLUE CROSS ID #
090006	Other	PA	BLUE SHIELD ID #

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 Margaret Atwell practice?

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

What is the NPI number for Margaret Atwell?

The National Provider Identifier (NPI) for Margaret Atwell is 1477550069, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Kate Ferrarello Physician Assistant · Sinking Spring, PA NPI 1730170002 Karen Near Chiropractor · Sinking Spring, PA NPI 1154384550 Yapa Apartment Living Program, Inc. Community/Behavioral Health Agency · Sinking Spring, PA NPI 1699820407 Orr Barak Dermatopathology Physician · Sinking Spring, PA NPI 1811182470 Hannah Berman Social Worker · Sinking Spring, PA NPI 1184400327

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.