Mark I Chieh Hong, M.D
Nephrology Physician · Mason City, IA
Mark I Chieh Hong, M.D is a nephrology physician with a practice address in Mason City, Iowa, and NPI 1982048286, issued on Apr 17, 2013. Check the license (Iowa 42588, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark I Chieh Hong
- Credential
- M.D
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 42588 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1000 4TH St SW, Mason City, IA 50401
- Phone
- (641) 428-6999
- Enumerated
- Apr 17, 2013
- Record last updated
- Jul 15, 2025
- Fax
- (641) 428-6678
- Medicare enrollment
- Enrolled (PECOS I20150707000676); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 92 in Iowa → Look up another NPI →
Also registered at 1000 4TH St SW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mohamed Abdi, MDRadiation Oncology Physician1982162608
- Luna Acharya, MDHospitalist Physician1609224674
- Jenna AdamsMental Health Counselor1407790710
- Sheela Ahari, MDAnesthesiology Physician1518910462
- Tauseef Akhtar, MDCardiovascular Disease Physician1508218009
- Emad Alamouti-Fard, MDFamily Medicine Physician1811821499
Verify Mark I Chieh Hong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 42588Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% more Medicare Part D claims than the average nephrology physician in 2024
1,541 Medicare Part D claims for 325 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Calcitriol396 claims
- Furosemide149 claims
- Allopurinol129 claims
- Torsemide118 claims
- Losartan Potassium101 claims
- Nifedipine Er66 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
2 hospitals and group practices
- Hancock County Health SystemBritt, IA · Critical Access Hospitals
- North Iowa Mercy ClinicsMason City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Mark I Chieh Hong among 92 nephrology physician records in Iowa
Mark I Chieh Hong, M.D is one of 92 nephrology physician records with a practice address in Iowa. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 70% of them.
- NPI issued2013 · 70% of these records are older, 29% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2010 · median 2001 among the 67 with a school on file
- Record last updated2025 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Iowa
There are 92 nephrology physician records in Iowa.
All 92 in Iowa → Every provider in Mason City → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Arsalan Alvi, MDDes Moines, IA 503141972099570
- Prem Chandran, M.D.Des Moines, IA 503141518969104
- Patrick Chua, M.D.Des Moines, IA 503141043487937
- Siva Jagarlapudi, M.D.Des Moines, IA 503141770533952
- Robert Smith, D.O.Des Moines, IA 503141891746350
- Jobinson Thomas, M.D.Des Moines, IA 503141871530055
- Mark Belz, MDDes Moines, IA 503091427012061
- Kanwaljit Chouhan, MDDes Moines, IA 503091033384086
Common questions
What is Mark I Chieh Hong, M.D's NPI number?
Mark I Chieh Hong, M.D's National Provider Identifier (NPI) is 1982048286, issued on Apr 17, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Mark I Chieh Hong, M.D located?
The NPPES record lists a practice address at 1000 4TH St SW, Mason City, IA, 50401. Phone: (641) 428-6999. Providers update this record themselves, so call before visiting.
How can I verify Mark I Chieh Hong, M.D's license?
NPPES lists Iowa license number 42588, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark I Chieh Hong, M.D prescribe under Medicare Part D?
In 2024, Mark I Chieh Hong, M.D had 1,541 Medicare Part D claims for 325 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.