Mark O. Carlson, M.D.
Internal Medicine Physician · Sioux City, IA
Mark O. Carlson, M.D. is an internal medicine physician with a practice address in Sioux City, Iowa, and NPI 1609837368, issued on Mar 31, 2006. Check the license (Iowa 27247, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark O. Carlson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 27247 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1605 Douglas St, Sioux City, IA 51105
- Phone
- (712) 234-1005
- Enumerated
- Mar 31, 2006
- Record last updated
- Nov 22, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (712) 234-0015
- Medicaid IDs
- 10025457800 NE
6004143 SD
2059956 IA - Medicare enrollment
- Enrolled (PECOS I20061215000009); accepts Medicare assignment
- Medical or professional school
- University Of Minnesota Medical School, 1986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →
Also registered at 1605 Douglas St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dawn Bricker, FNPFamily Nurse Practitioner1790061612
Verify Mark O. Carlson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 27247Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% more Medicare Part D claims than the average internal medicine physician in 2024
4,514 Medicare Part D claims for 234 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 68 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium210 claims
- Telmisartan206 claims
- Levothyroxine Sodium177 claims
- Atorvastatin Calcium154 claims
- Amlodipine Besylate120 claims
- Furosemide100 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: $5,659.32
56 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Siouxland Adult Medicine, PLLCSioux City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark O. Carlson among 871 internal medicine physician records in Iowa
Mark O. Carlson, M.D. is one of 871 internal medicine physician records with a practice address in Iowa. 70% 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 11% of them.
- NPI issued2006 · 11% of these records are older, 62% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 44% of these records are
- Graduated1986 · median 2008 among the 386 with a school on file
- Record last updated2012 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 internal medicine physician records list a practice address in Sioux City
They are 20 of the 1,486 NPPES records with a practice address in Sioux City, and 871 internal medicine physician records in Iowa.
All 871 in Iowa → Every provider in Sioux City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dale Holdiman, MDSioux City, IA 511051306894050
- David Lucke, MDSioux City, IA 511051457309197
- Craig Bainbridge, M.D.Sioux City, IA 511041689750150
- Jolynn Bugbee, M.D.Sioux City, IA 511041801858774
- David Daniels, M.D.Sioux City, IA 511061972558229
- Chakravarthi PuretiSioux City, IA 511041780809004
- Shila Simkhada, M.DSioux City, IA 511041548834336
- Robert Stewart, M.D.Sioux City, IA 511041124104609
Common questions
What is Mark O. Carlson, M.D.'s NPI number?
Mark O. Carlson, M.D.'s National Provider Identifier (NPI) is 1609837368, issued on Mar 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark O. Carlson, M.D. located?
The NPPES record lists a practice address at 1605 Douglas St, Sioux City, IA, 51105. Phone: (712) 234-1005. Providers update this record themselves, so call before visiting.
How can I verify Mark O. Carlson, M.D.'s license?
NPPES lists Iowa license number 27247, 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 O. Carlson, M.D. prescribe under Medicare Part D?
In 2024, Mark O. Carlson, M.D. had 4,514 Medicare Part D claims for 234 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.