NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marvin M Portner, M.D.

Allergy Physician in Mount Pleasant, SC · enumerated 2006 · practices at Portner Medical PC.

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

National Provider Identifier

1356366793

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Registry record

Entity type Individual (Type 1)
Name Dr. Marvin M Portner
Credential M.D.
Sex Male
Practice address 1783 Shell Ring Cir, Mount Pleasant, SC, 29466
Phone (310) 266-3050
Fax (310) 454-5318
Enumeration date Jul 13, 2006
Last updated in NPPES Apr 18, 2022

Taxonomy & licenses

207KA0200X Allergy Physician Allopathic & Osteopathic Physicians · License C28757 (CA) Secondary
207KA0200X Allergy Physician Allopathic & Osteopathic Physicians · License MD87328 (SC) 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
MD87328 Other SC STATE OF SOUTH CAROLINA

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.

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Frequently asked questions

Is NPI 1356366793 active?
Yes, as of the latest NPPES snapshot, NPI 1356366793 is active (record last updated 2022-04-18).
How do I verify Marvin Portner's NPI record?
Cross-check NPI 1356366793 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 2022-04-18.