Ronald J. Janzen, MD
Specialist · Oklahoma City, OK
Ronald J. Janzen, MD is a specialist with a practice address in Oklahoma City, Oklahoma, and NPI 1982643383, issued on Jun 4, 2006. Check the license (Oklahoma 10445, as entered in NPPES) with the Oklahoma board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Ronald J. Janzen
- Credential
- MD
- Primary taxonomy
- Specialist 174400000X
- License number
- 10445 OK
Self-reported in NPPES; status is on the state search - Practice location
- 4200 W Memorial RD, Oklahoma City, OK 73120
- Phone
- (405) 755-2087
- Enumerated
- Jun 4, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (405) 755-2959
- Entity
- Type 1 · individual
8 nearest specialist records → All 422 in Oklahoma → Look up another NPI →
Also registered at 4200 W Memorial RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ronald J. Janzen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Oklahoma board licenses this profession
Search for license 10445Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Ronald J. Janzen among 422 specialist records in Oklahoma
Ronald J. Janzen, MD is one of 422 specialist records with a practice address in Oklahoma. 18% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 63% newer
- In a Medicare fileNo · 18% of these records are
- In the CMS Doctors and Clinicians fileNo · 12% of these records are
- Record last updated2026 · 83% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Oklahoma
There are 422 specialist records in Oklahoma. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 422 in Oklahoma → Every provider in Oklahoma City → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Stephen Cagle, M.D.Oklahoma City, OK 731201053300483
- Lawrence Deck, M.D.Oklahoma City, OK 731201467495911
- Charles Engles, M.D.Oklahoma City, OK 731201710960240
- Jacqueline GreenOklahoma City, OK 731201568866648
- Robert Hein, M.D.Oklahoma City, OK 731201023026697
- Gregory Isch, P.T.Oklahoma City, OK 731201447290564
- Jay Johnston, M.D.Oklahoma City, OK 731201740217082
- Janet Ritchie, NPOklahoma City, OK 731201437374592
Common questions
What is Ronald J. Janzen, MD's NPI number?
Ronald J. Janzen, MD's National Provider Identifier (NPI) is 1982643383, issued on Jun 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald J. Janzen, MD located?
The NPPES record lists a practice address at 4200 W Memorial RD, Oklahoma City, OK, 73120. Phone: (405) 755-2087. Providers update this record themselves, so call before visiting.
How can I verify Ronald J. Janzen, MD's license?
NPPES lists Oklahoma license number 10445, as entered by the provider. Search the Oklahoma board that licenses this profession; the NPPES record confirms identity 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. 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.