Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Steven Hunt Diener, M.D.

Internal Medicine Physician in Columbia, MD · enumerated 2005 · practices at Maryland Primary Care Physicians, LLC.

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

National Provider Identifier

1558362111

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Registry record

Entity type Individual (Type 1)

Name Dr. Steven Hunt Diener

Credential M.D.

Sex Male

Practice address 5900 Waterloo Rd Ste 200, Columbia, MD, 21045

Phone (410) 740-2900

Fax (410) 992-0732

Enumeration date Aug 4, 2005

Last updated in NPPES Mar 16, 2023

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D34868 (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
398142-01	Other	MD	CAREFIRST MD RENDERING
4087647	Other	MD	AETNA FEE FOR SERVICE
P12727	Other	MD	CAREFIRST MPOS
066221	Other	MD	AETNA CAPITATED
1333045	Other	MD	CIGNA PIN
110140700	Other	MD	RR MEDICARE
243354	Other	MD	MAMSI SPECIALIST
14480	Other	MD	JHHC PROVIDER NUMBER
443221500	Medicaid	MD	-
843354	Other	MD	MAMSI PRIMARY CARE
3509-0002	Other	MD	CAREFIRST BLUECHOICE

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 Steven Diener practice?

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

What is the NPI number for Steven Diener?

The National Provider Identifier (NPI) for Steven Diener is 1558362111, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-16.