Data from the NPPES registry. May not reflect recent changes — verify at nppes.cms.hhs.gov.
DR. WILLIAM J RIESEN, MD
ActiveDR. WILLIAM J RIESEN, MD is a Internal Medicine healthcare provider located in MASON CITY, Iowa. NPI 1548377997 is currently active in the NPPES registry. Verify at CMS.
Internal Medicine · MASON CITY, IA
Registration Details
- NPI Number
- 1548377997
- Provider Type
- Individual
- Gender
- Male
- NPI Issued
- Aug 23, 2006 (19.950501137037 yrs)
- Last Updated
- Jul 14, 2025
- License
-
31260 (IA)
Practice Information
- Address
-
1010 4TH ST SW STE 305MASON CITY, IA, 504012801Browse IA providers · Browse ZIP 50401
- Phone
- 6414285700
- Fax
- 6414282515
- Primary Specialty
-
Internal Medicine
207R00000X
Other Internal Medicine Providers in MASON CITY, IA
| Name | Credential | NPI |
|---|---|---|
| DR. J.D. THORESON | M.D. | 1366430530 |
| DR. ALI H MARDAN | PHD, MD, RPVI, FACP | 1619905353 |
| VAUGHAN ROBERT CIPPERLY | MD | 1942235429 |
| MARK C JOHNSON | MD | 1013923127 |
| YUVARAJ THANGARAJ | MD | 1215943063 |
| AMY TESAR | DO | 1841307477 |
Data sourced from the NPPES National Provider Identifier registry. This information is for informational purposes only and is not a substitute for verifying credentials with the appropriate licensing authority. For official verification, use the NPPES NPI Registry or the relevant state medical board.