Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Linwood Simmons, M.D.

Q: What is the NPI number for Mark Simmons?

The National Provider Identifier (NPI) for Mark Simmons is 1619959285, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Lancaster, PA · enumerated 2005.

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

National Provider Identifier

1619959285

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Linwood Simmons

Credential M.D.

Sex Male

Practice address 2110 Harrisburg Pike, Suite 100, Lancaster, PA, 17601

Phone (717) 544-3191

Fax (717) 544-3637

Enumeration date Nov 18, 2005

Last updated in NPPES Sep 6, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD064373L (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
I71009	Other	PA	HEALTH AMERICA
1947245	Other	PA	HIGHMARK BLUE SHIELD
107756 S1QA	Other	PA	GEISINGER HEALTH PLAN
1018709640001	Medicaid	PA	-
1574107	Other	PA	AETNA HMO
50066312	Other	PA	CAPITAL BLUE CROSS
7167924	Other	PA	AETNA NON-HMO

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 Mark Simmons practice?

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

What is the NPI number for Mark Simmons?

The National Provider Identifier (NPI) for Mark Simmons is 1619959285, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Elizabeth O'Connor-Boll Internal Medicine Physician · Lancaster, PA NPI 1922092618 Viviana Hardy Endocrinology, Diabetes & Metabolism Physician · Lancaster, PA NPI 1093703803 Paul Conslato Internal Medicine Physician · Lancaster, PA NPI 1366431934 Donna Leonardo Ophthalmology Physician · Lancaster, PA NPI 1780644716 Michael Pavlica Ophthalmology Physician · Lancaster, PA NPI 1699735613 Elizabeth Ellen Vogel Adult Health Nurse Practitioner · Lancaster, PA NPI 1932169471 Alan Hay Occupational Medicine Physician · Lancaster, PA NPI 1649233248 John Kramer Occupational Medicine Physician · Lancaster, PA NPI 1427011949

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-09-06.