Mark Schafer, MD
NPI 1417948894 · Internal Medicine Physician · Tustin, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Schafer, MD is a Internal Medicine Physician provider in Tustin, CA (NPI 1417948894).
Provider details
- NPI number
- 1417948894
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G69584 (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
- 2005-11-03
- Last updated
- 2018-02-08
Frequently asked questions
- What is Mark Schafer's NPI number?
- Mark Schafer's National Provider Identifier (NPI) is 1417948894, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Schafer's specialty?
- Mark Schafer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Schafer located?
- Mark Schafer's practice location on file with NPPES is 2742 Dow Ave, Tustin, CA 92780-7242.
- What is Mark Schafer's phone number?
- The practice phone number listed in the NPPES registry for Mark Schafer is (714) 665-1661.
- Does Mark Schafer accept Medicare?
- Mark Schafer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Schafer's NPI active?
- Yes — Mark Schafer's NPI (1417948894) is active in the NPPES registry as of the last update on 2018-02-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.