Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark S Ridlen, MD

Diagnostic Radiology Physician in Warwick, RI · enumerated 2005 · practices at Rhode Island Medical Imaging Inc.

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

National Provider Identifier

1245228121

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Registry record

Entity type Individual (Type 1)

Name Mark S Ridlen

Credential MD

Sex Male

Practice address 125 Metro Center Blvd Ste 2000, Warwick, RI, 02886

Phone (401) 432-2520

Fax (401) 453-8220

Enumeration date Oct 13, 2005

Last updated in NPPES Mar 18, 2019

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 7132 (RI) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 154865 (MA) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License MD07132 (RI) 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
1600241	Other	-	UNITED HEALTH PLANS
7132	Other	-	FEP BLUE CROSS
007000613	Other	-	HOSPITAL PIN
007132	Other	-	TUFTS
2013789	Medicaid	MA	-
7000613	Other	-	RIMEDICAL ASSISTANCE
003117240	Other	-	CT MED ASSISTANCE
007132	Other	-	BLUE SHIELD
240156	Other	-	W&I PILGRIM
000000001988	Other	-	NHPRI
004372	Other	-	BLUE CHIP
300067430	Other	-	RAILROAD MEDICARE
240156	Other	-	RIHPILGRIM
720051701	Other	-	CIGNA

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 1245228121 active?

Yes, as of the latest NPPES snapshot, NPI 1245228121 is active (record last updated 2019-03-18).

How do I verify Mark Ridlen's NPI record?

Cross-check NPI 1245228121 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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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-03-18.