Frederick C. Johlin, MD
Gastroenterology Physician · Iowa City, IA
Frederick C. Johlin, MD is a gastroenterology physician with a practice address in Iowa City, Iowa, and NPI 1821085960, issued on Oct 4, 2005. Check the license (Iowa 23554, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Frederick C. Johlin
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 23554 IA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Hawkins Dr, Iowa City, IA 52242
- Phone
- (319) 356-4901
- Enumerated
- Oct 4, 2005
- Record last updated
- Sep 2, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (319) 384-8559
- Medicaid ID
- 0215855 IA
- Medicare enrollment
- Enrolled (PECOS I20100910000059); accepts Medicare assignment
- Medical or professional school
- Medical College Of Ohio, 1980
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 122 in Iowa → Look up another NPI →
Also registered at 200 Hawkins Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Abdalla Abdalla, MBBCHAnatomic Pathology & Clinical Pathology Physician1518859826
- Sameh AbdallaAnatomic Pathology & Clinical Pathology Physician1437902160
Verify Frederick C. Johlin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 23554Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average gastroenterology physician in 2024
91 Medicare Part D claims for 29 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Ursodiol29 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.
Bills Medicare through one group practice
- State University OF IowaIowa City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frederick C. Johlin among 122 gastroenterology physician records in Iowa
Frederick C. Johlin, MD is one of 122 gastroenterology physician records with a practice address in Iowa. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 73% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1980 · median 2000 among the 84 with a school on file
- Record last updated2021 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Iowa
There are 122 gastroenterology physician records in Iowa.
All 122 in Iowa → Every provider in Iowa City → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Dean Abramson, MDIowa City, IA 522421275517658
- Anjana Aggarwal, MDIowa City, IA 522421467436899
- Naurang Agrawal, MDIowa City, IA 522421083661771
- Kyle Brown, MDIowa City, IA 522421851388904
- David Elliott, MD PHDIowa City, IA 522421881668689
- F Field, MDIowa City, IA 522421922095066
- Henning Gerke, MDIowa City, IA 522421588644207
- Jeffrey Goldman, MDIowa City, IA 522421316942212
Common questions
What is Frederick C. Johlin, MD's NPI number?
Frederick C. Johlin, MD's National Provider Identifier (NPI) is 1821085960, issued on Oct 4, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Frederick C. Johlin, MD located?
The NPPES record lists a practice address at 200 Hawkins Dr, Iowa City, IA, 52242. Phone: (319) 356-4901. Providers update this record themselves, so call before visiting.
How can I verify Frederick C. Johlin, MD's license?
NPPES lists Iowa license number 23554, 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 Frederick C. Johlin, MD prescribe under Medicare Part D?
In 2024, Frederick C. Johlin, MD had 91 Medicare Part D claims for 29 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.