Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert J Patterson, M.D.

Internal Medicine Physician in St Michaels, MD · enumerated 2006 · practices at Robert J Patterson, MD LLC.

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

National Provider Identifier

1033201355

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Registry record

Entity type Individual (Type 1)

Name Dr. Robert J Patterson

Credential M.D.

Sex Male

Practice address 800 S Talbot St, St Michaels, MD, 21663

Phone (410) 745-0450

Fax (410) 745-0452

Enumeration date Sep 28, 2006

Last updated in NPPES Nov 24, 2009

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0057908 (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
199621300	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

Is NPI 1033201355 active?

Yes, as of the latest NPPES snapshot, NPI 1033201355 is active (record last updated 2009-11-24).

How do I verify Robert Patterson's NPI record?

Cross-check NPI 1033201355 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Robert J Patterson, MD LLC Internal Medicine Physician · St Michaels, MD NPI 1891887014

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-24.