Gary Steven Marckstadt, MD
Family Medicine Physician · Sioux Falls, SD
Gary Steven Marckstadt, MD is a family medicine physician with a practice address in Sioux Falls, South Dakota, and NPI 1053364091, issued on May 19, 2006. Check the license (South Dakota 3887, as entered in NPPES) on the South Dakota Board of Medical and Osteopathic Examiners; the Medicare figures below come from public CMS files.
- Name
- Gary Steven Marckstadt
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 3887 SD
Self-reported in NPPES; status is on the state search - Practice location
- 900 E 54TH St N Ste 200, Sioux Falls, SD 57104
- Phone
- (605) 332-2883
- Enumerated
- May 19, 2006
- Record last updated
- Sep 6, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (605) 328-5831
- Entity
- Type 1 · individual
Also registered at 900 E 54TH St N Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa AtnipNurse Practitioner1861684995
- Aleesha Clyde, OTOccupational Therapist1508131269
- Kara Dejong, CNPNurse Practitioner1710602958
- Gregory Hoyme, P.T.Physical Therapist1104082585
- Kelly Marshall, OTOccupational Therapist1639409493
- Timothy Nydam, M.D.Emergency Medicine Physician1972714533
Verify Gary Steven Marckstadt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Dakota Board of Medical and Osteopathic Examiners
Search for license 3887Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average family medicine physician in 2024
115 Medicare Part D claims for 22 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
195 family medicine physician records list a practice address in Sioux Falls
They are 195 of the 6,563 NPPES records with a practice address in Sioux Falls, and 601 family medicine physician records in South Dakota.
All 195 in Sioux Falls → All 601 in South Dakota → Every provider in Sioux Falls →
Other family medicine physician records in South Dakota
- Adeem Abdulwahab, M.DSioux Falls, SD1720432073
- Gordon Abernathie, D.O.Rapid City, SD1053316174
- Kyle Adams, D.O.Rapid City, SD1881009496
- Mary Ahlers, DOBrookings, SD1609301365
- Alese Allerdings, M.D.De Smet, SD1285926261
- Jay Allison, MDSioux Falls, SD1235195041
- E. Amundson, MDSioux Falls, SD1144220914
- Sylvia Anderson, MDFaulkton, SD1790891844
- Wayne Anderson, MDSpearfish, SD1902834914
- Roberto Anel, MDSioux Falls, SD1841411444
Common questions
What is Gary Steven Marckstadt, MD's NPI number?
Gary Steven Marckstadt, MD's National Provider Identifier (NPI) is 1053364091, issued on May 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Steven Marckstadt, MD located?
The NPPES record lists a practice address at 900 E 54TH St N Ste 200, Sioux Falls, SD, 57104. Phone: (605) 332-2883. Providers update this record themselves, so call before visiting.
How can I verify Gary Steven Marckstadt, MD's license?
NPPES lists South Dakota license number 3887, as entered by the provider. Search the South Dakota Board of Medical and Osteopathic Examiners at https://www.sdbmoe.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gary Steven Marckstadt, MD prescribe under Medicare Part D?
In 2024, Gary Steven Marckstadt, MD had 115 Medicare Part D claims for 22 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.