Mark Chao, M.D., PH.D.
NPI 1770872632 · Hematology (Internal Medicine) Physician · Stanford, CA
Mark Chao, M.D., PH.D. is a Hematology (Internal Medicine) Physician provider in Stanford, CA (NPI 1770872632).
Provider details
- NPI number
- 1770872632
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- E2515944 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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
- 2011-03-31
- Last updated
- 2016-11-29
Frequently asked questions
- What is Mark Chao's NPI number?
- Mark Chao's National Provider Identifier (NPI) is 1770872632, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Chao's specialty?
- Mark Chao is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Chao located?
- Mark Chao's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Mark Chao's phone number?
- The practice phone number listed in the NPPES registry for Mark Chao is (650) 723-4000.
- Is Mark Chao's NPI active?
- Yes — Mark Chao's NPI (1770872632) is active in the NPPES registry as of the last update on 2016-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.