John Steven Portwood, M.D.
Orthopaedic Surgery Physician · Riverside, CA
John Steven Portwood, M.D. is an orthopaedic surgery physician with a practice address in Riverside, California, and NPI 1255393492, issued on Apr 4, 2006. Check the license (California G51596, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Steven Portwood
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G51596 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3838 Sherman Dr, Riverside, CA 92503
- Phone
- (951) 354-7270
- Enumerated
- Apr 4, 2006
- Record last updated
- Mar 2, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (951) 354-0625
- Medicaid ID
- 00G546710 CA
- Entity
- Type 1 · individual
Also registered at 3838 Sherman Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Aguilar, FNPFamily Nurse Practitioner1316319106
- Syed Nawas Ahmed, DPMFoot & Ankle Surgery Podiatrist1619474558
- Ming-Chuan Chang, WHNP-BC,, PH.D.Women's Health Nurse Practitioner1982996898
- Chandrasekhar EadaraPharmacist1053855585
- Michelle Garcia, PA-CPhysician Assistant1952396392
- Timothy Gray, M.D.Orthopaedic Surgery of the Spine Physician1972565877
Verify John Steven Portwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G51596Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
Other orthopaedic surgery physician records in California
- Karim Abdollahi, M.D.Laguna Beach, CA1942240403
- Michael Abdulian, MDGlendale, CA1649469628
- Hussein Abdulrassoul, MDRiverside, CA1972123891
- Douglas Abeles, MDCastro Valley, CA1508961582
- Anthony Abene, MDSan Jose, CA1457437964
- Torgom Abraamyan, M.D.Van Nuys, CA1013370410
- Monther AbuhantashSan Francisco, CA1447041512
- Joshua Acebo, MDPalo Alto, CA1396373734
- Daniel Acevedo, M.D.Thousand Oaks, CA1184856122
- John Adams, MDLos Angeles, CA1215914114
Common questions
What is John Steven Portwood, M.D.'s NPI number?
John Steven Portwood, M.D.'s National Provider Identifier (NPI) is 1255393492, issued on Apr 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Steven Portwood, M.D. located?
The NPPES record lists a practice address at 3838 Sherman Dr, Riverside, CA, 92503. Phone: (951) 354-7270. Providers update this record themselves, so call before visiting.
How can I verify John Steven Portwood, M.D.'s license?
NPPES lists California license number G51596, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.