Mark Ishimaru, MD
NPI 1821041161 · Orthopaedic Surgery Physician · Mission Viejo, CA
Mark Ishimaru, MD is a Orthopaedic Surgery Physician provider in Mission Viejo, CA (NPI 1821041161).
Provider details
- NPI number
- 1821041161
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G27381 (CA)
Specialties & taxonomies
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
- 2006-05-18
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Ishimaru's NPI number?
- Mark Ishimaru's National Provider Identifier (NPI) is 1821041161, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ishimaru's specialty?
- Mark Ishimaru is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Ishimaru located?
- Mark Ishimaru's practice location on file with NPPES is 26730 Crown Valley Parkway, Mission Viejo, CA 92691-8001.
- What is Mark Ishimaru's phone number?
- The practice phone number listed in the NPPES registry for Mark Ishimaru is (949) 364-2154.
- Is Mark Ishimaru's NPI active?
- Yes — Mark Ishimaru's NPI (1821041161) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.