Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark D Weissig, MD

Individual provider Internal Medicine Physician · NPI 1649266032

Mark D Weissig, MD is a Pulmonary Disease in Fullerton, California. Graduated from Duke University School of Medicine in 1980, 46 years ago. Practices with Providence Medical Foundation, a 1,465-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
46
Trained at
Duke University School of Medicine
Licensed in
CA
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2141 N Harbor Blvd Ste 25000
Fullerton, CA 92835-3827
Phone: (714) 626-8610
Fax: (714) 626-8655
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence G49175 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence G49175 (CA)

Record details

NPI number1649266032
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 21, 2005
Last updated in NPPESApril 25, 2013
Mailing address279 Imperial Hwy, Suite 730, Fullerton, CA 92835-1041

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPULMONARY DISEASE
Medical schoolDUKE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1980 (46 years in practice)
Group practice Providence Medical Foundation — 1465 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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