Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mr. Mark I Chieh Hong, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1982048286

Mr. Mark I Chieh Hong, MD is a Nephrology in Mason City, Iowa. Qualified in 2010, 16 years ago. Practices with North Iowa Mercy Clinics, a 300-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Iowa.

Years since qualifying
16
Licensed in
IA
In the registry since
2013
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 4th St SW
Mason City, IA 50401-2800
Phone: (641) 428-6999
Fax: (641) 428-6678
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence 42588 (IA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1982048286
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 17, 2013
Last updated in NPPESJuly 15, 2025
Certification dateJuly 15, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEPHROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2010 (16 years in practice)
Group practice North Iowa Mercy Clinics — 300 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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