Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark I Chieh Hong, M.D

Nephrology Physician in Mason City, IA · enumerated 2013.

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

National Provider Identifier

1982048286

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark I Chieh Hong

Credential M.D

Sex Male

Practice address 1000 4th St Sw, Mason City, IA, 50401

Phone (641) 428-6999

Fax (641) 428-6678

Enumeration date Apr 17, 2013

Last updated in NPPES Jul 15, 2025

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 42588 (IA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

How do I verify Mark Hong's NPI record?

Cross-check NPI 1982048286 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1982048286 active?

Yes, as of the latest NPPES snapshot, NPI 1982048286 is active (record last updated 2025-07-15).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-15.