John Portwood, M.D.
NPI 1255393492 · Orthopaedic Surgery Physician · Riverside, CA
John Portwood, M.D. is a Orthopaedic Surgery Physician provider in Riverside, CA (NPI 1255393492).
Provider details
- NPI number
- 1255393492
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G51596 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-04
- Last updated
- 2010-03-02
Frequently asked questions
- What is John Portwood's NPI number?
- John Portwood's National Provider Identifier (NPI) is 1255393492, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Portwood's specialty?
- John Portwood is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is John Portwood located?
- John Portwood's practice location on file with NPPES is 3838 Sherman Dr, Riverside, CA 92503-4001.
- What is John Portwood's phone number?
- The practice phone number listed in the NPPES registry for John Portwood is (951) 354-7270.
- Is John Portwood's NPI active?
- Yes — John Portwood's NPI (1255393492) is active in the NPPES registry as of the last update on 2010-03-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.