Ian K. Hornstra, MD
Dermatology Physician · Saint Louis, MO
Ian K. Hornstra, MD is a dermatology physician with a practice address in Saint Louis, Missouri, and NPI 1124044359, issued on Jul 14, 2006. Check the license (Missouri R2H85, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Ian K. Hornstra
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- R2H85 MO
Self-reported in NPPES; status is on the state search - Practice location
- 915 N Grand Blvd, Saint Louis, MO 63106
- Phone
- (314) 652-4100
- Enumerated
- Jul 14, 2006
- Record last updated
- May 7, 2024
- Fax
- (314) 238-6569
- Medicaid ID
- 208235903 MO
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 278 in Missouri → Look up another NPI →
Also registered at 915 N Grand Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jessica Addai, RNRegistered Nurse1225475171
- Bernadette Addison-TannerCase Management Registered Nurse1750143566
- Oluwafunmilayo Adebayo-Adonis, MDCritical Care Medicine (Anesthesiology) Physician1437593613
- Oluwatoyin Adegboyega, FNPFamily Nurse Practitioner1932724614
Verify Ian K. Hornstra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license R2H85Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average dermatology physician in 2024
30 Medicare Part D claims for 21 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D.
Most prescribed
- Triamcinolone Acetonide11 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.
Industry payments in 2024: $55.59
2 payments; by number, the most common kind was food and beverage; the largest payer was Leo Pharma 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.
Ian K. Hornstra among 278 dermatology physician records in Missouri
Ian K. Hornstra, MD is one of 278 dermatology physician records with a practice address in Missouri. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 61% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2024 · 47% 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 Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in Missouri
There are 278 dermatology physician records in Missouri.
All 278 in Missouri → Every provider in Saint Louis → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Jerome Aronberg, MDClayton, MO 631051861488926
- Abby Johnson, MDClayton, MO 631051033672662
- Osamuede Osemwota, MDSaint Louis, MO 631051275972432
- Mallory Abate, M.D.Saint Louis, MO 631041710320767
- Milan Anadkat, MDSaint Louis, MO 631081639267149
- Sofia Chaudhry, MDSaint Louis, MO 631041134381213
- David Chen, MDSaint Louis, MO 631081497018774
- Emily Cole, MDSaint Louis, MO 631081194105981
Common questions
What is Ian K. Hornstra, MD's NPI number?
Ian K. Hornstra, MD's National Provider Identifier (NPI) is 1124044359, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ian K. Hornstra, MD located?
The NPPES record lists a practice address at 915 N Grand Blvd, Saint Louis, MO, 63106. Phone: (314) 652-4100. Providers update this record themselves, so call before visiting.
How can I verify Ian K. Hornstra, MD's license?
NPPES lists Missouri license number R2H85, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ian K. Hornstra, MD prescribe under Medicare Part D?
In 2024, Ian K. Hornstra, MD had 30 Medicare Part D claims for 21 beneficiaries; the average among dermatology physician prescribers was 797. 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.