Stephen C. Riggs, M.D.
Internal Medicine Physician · Waterloo, IA
Stephen C. Riggs, M.D. is an internal medicine physician with a practice address in Waterloo, Iowa, and NPI 1871520080, issued on Jun 26, 2006. Check the license (Iowa 28568, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Stephen C. Riggs
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 28568 IA
Self-reported in NPPES; status is on the state search - Practice location
- 236 National Dr, Waterloo, IA 50701
- Phone
- (319) 272-0000
- Enumerated
- Jun 26, 2006
- Record last updated
- Jul 16, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (319) 272-0016
- Medicaid ID
- 1126169 IA
- Medicare enrollment
- Enrolled (PECOS I20100618000874); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 871 in Iowa → Look up another NPI →
Also registered at 236 National Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kaylie HackenmillerNurse Practitioner1851260418
- Jodi Vansickle, M.D.Pediatrics Physician1982630703
Verify Stephen C. Riggs in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 28568Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% more Medicare Part D claims than the average internal medicine physician in 2024
5,511 Medicare Part D claims for 548 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 226 claims were for opioids.
Most prescribed
- Levothyroxine Sodium323 claims
- Atorvastatin Calcium258 claims
- Omeprazole182 claims
- Lisinopril178 claims
- Amlodipine Besylate157 claims
- Metformin Hcl128 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
- Covenant Medical Center IncWaterloo, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen C. Riggs among 871 internal medicine physician records in Iowa
Stephen C. Riggs, 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
- Graduated1987 · median 2008 among the 386 with a school on file
- Record last updated2007 · 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).
37 internal medicine physician records list a practice address in Waterloo
They are 37 of the 1,512 NPPES records with a practice address in Waterloo, and 871 internal medicine physician records in Iowa.
All 871 in Iowa → Every provider in Waterloo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Burton Adrian, M.D.Waterloo, IA 507011730138769
- Renu Bansal, MDWaterloo, IA 507011225238280
- Bruce Baridon, DOWaterloo, IA 507011205894581
- Vinko Bogdanic, M.D.Waterloo, IA 507011932184249
- Michael Deters, MDWaterloo, IA 507011346227477
- Pratibha Dua, MDWaterloo, IA 507011235116369
- Thomas Spragg, MDWaterloo, IA 507011093793580
- Paul Franke, M.D.Waterloo, IA 507021003082546
Common questions
What is Stephen C. Riggs, M.D.'s NPI number?
Stephen C. Riggs, M.D.'s National Provider Identifier (NPI) is 1871520080, issued on Jun 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen C. Riggs, M.D. located?
The NPPES record lists a practice address at 236 National Dr, Waterloo, IA, 50701. Phone: (319) 272-0000. Providers update this record themselves, so call before visiting.
How can I verify Stephen C. Riggs, M.D.'s license?
NPPES lists Iowa license number 28568, 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 Stephen C. Riggs, M.D. prescribe under Medicare Part D?
In 2024, Stephen C. Riggs, M.D. had 5,511 Medicare Part D claims for 548 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.