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

Marissa M Wen, MD

Individual provider Internal Medicine Physician · NPI 1467999169

Marissa M Wen, MD is an Internal Medicine in Lathrop, California. Qualified in 2003, 23 years ago. Practices with Permanente Medical Group Inc, a 10,941-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
23
Licensed in
CA
In the registry since
2017
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

1507 Garden Farms Ave
Lathrop, CA 95330-8292
Phone: (209) 479-8000
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 4601 Dale Rd, Modesto, CA 95356-9718 — (209) 735-5000

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A161459 (CA)

Record details

NPI number1467999169
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 20, 2017
Last updated in NPPESJanuary 21, 2022
Certification dateJanuary 21, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2003 (23 years in practice)
Group practice Permanente Medical Group Inc — 10941 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount