Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mariaileen Sourwine, M.D.

Internal Medicine Physician in Arnold, MD · enumerated 2008.

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

National Provider Identifier

1528227378

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Registry record

Entity type Individual (Type 1)

Name Dr. Mariaileen Sourwine

Credential M.D.

Sex Female

Practice address 277 Peninsula Farm Rd Ste I, Arnold, MD, 21012

Phone (410) 989-8833

Fax (410) 975-5641

Enumeration date Jun 6, 2008

Last updated in NPPES Dec 7, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D72591 (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
D72591	Other	MD	MARYLAND STATE LICENSE

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 is the NPI number for Mariaileen Sourwine?

The National Provider Identifier (NPI) for Mariaileen Sourwine is 1528227378, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mariaileen Sourwine practice?

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

Other providers at this practice address

Browse all →

Susan Moreland Adult Health Nurse Practitioner · Arnold, MD NPI 1427026046 Sara Adelman Adult Health Nurse Practitioner · Arnold, MD NPI 1427142553 Inspireim, LLC Internal Medicine Physician · Arnold, MD NPI 1750911806 Magothy Therapy & Wellness LLC Occupational Therapist · Arnold, MD NPI 1487422986 Privia Medical Group, LLC Internal Medicine Physician · Arnold, MD NPI 1225890627

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-07.