Mark Khoo, MD
NPI 1659351930 · Internal Medicine Physician · Hayward, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Khoo, MD is a Internal Medicine Physician provider in Hayward, CA (NPI 1659351930).
Provider details
- NPI number
- 1659351930
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G67768 (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
- 2006-01-20
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Khoo's NPI number?
- Mark Khoo's National Provider Identifier (NPI) is 1659351930, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Khoo's specialty?
- Mark Khoo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Khoo located?
- Mark Khoo's practice location on file with NPPES is 25800 Carlos Bee Blvd, Hayward, CA 94542-3060.
- What is Mark Khoo's phone number?
- The practice phone number listed in the NPPES registry for Mark Khoo is (510) 885-3735.
- Does Mark Khoo accept Medicare?
- Mark Khoo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Khoo's NPI active?
- Yes — Mark Khoo's NPI (1659351930) 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.