John Mark Demay, MD
Dermatology Physician · Sioux City, IA
John Mark Demay, MD is a dermatology physician with a practice address in Sioux City, Iowa, and NPI 1366447294, issued on Jun 16, 2005. Check the license (Iowa 31906, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- John Mark Demay
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- 31906 IA
Self-reported in NPPES; status is on the state search - Practice location
- 2930 Hamilton Blvd, Sioux City, IA 51104
- Phone
- (712) 277-9370
- Enumerated
- Jun 16, 2005
- Record last updated
- Aug 16, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (712) 252-4733
- Medicare enrollment
- Enrolled (PECOS I20111209000076); accepts Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 105 in Iowa → Look up another NPI →
Also registered at 2930 Hamilton Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Grote, PAMedical Physician Assistant1164465019
- Tod Knopik, DDSGeneral Practice Dentistry1154332450
Verify John Mark Demay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 31906Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average dermatology physician in 2024
670 Medicare Part D claims for 296 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims.
Most prescribed
- Triamcinolone Acetonide162 claims
- Amoxicillin138 claims
- Gentamicin Sulfate52 claims
- Clobetasol Propionate51 claims
- Clindamycin Phosphate40 claims
- Valacyclovir32 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $117.93
7 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 10,250 providers of this specialty with any payment received $8,544.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Dermatology Associates OF Siouxland PCSioux City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Mark Demay among 105 dermatology physician records in Iowa
John Mark Demay, MD is one of 105 dermatology physician records with a practice address in Iowa. 81% 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, 87% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1989 · median 2008 among the 71 with a school on file
- Record last updated2016 · 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 207N00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in Iowa
There are 105 dermatology physician records in Iowa.
All 105 in Iowa → Every provider in Sioux City → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Wilmar Garcia, FNP-CSioux City, IA 511041740953439
- Jo Burkhalter, MDCherokee, IA 510121699828962
- Bryon Gaul, M.D.Spencer, IA 513011508811076
- Kent Ellerbroek, MDWaterloo, IA 507021104800192
- Justin Ellerbroek, M.D.Waterloo, IA 507011790981207
- Bryan Sands, DOWaterloo, IA 507011770548570
- Carey Bligard, MDFort Dodge, IA 505011790756260
- Scott Green, MDFort Dodge, IA 505011760454821
Common questions
What is John Mark Demay, MD's NPI number?
John Mark Demay, MD's National Provider Identifier (NPI) is 1366447294, issued on Jun 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Mark Demay, MD located?
The NPPES record lists a practice address at 2930 Hamilton Blvd, Sioux City, IA, 51104. Phone: (712) 277-9370. Providers update this record themselves, so call before visiting.
How can I verify John Mark Demay, MD's license?
NPPES lists Iowa license number 31906, 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 John Mark Demay, MD prescribe under Medicare Part D?
In 2024, John Mark Demay, MD had 670 Medicare Part D claims for 296 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
What is John Mark Demay, MD's MIPS final score?
The 2023 MIPS final score is 96.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.