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

Individual provider Internal Medicine Physician · NPI 1679539415

Mark T Fahlen, MD is a Nephrology in Modesto, California. Graduated from Albany Medical College of Union University in 1998, 28 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
28
Trained at
Albany Medical College of Union University
Licensed in
CA
In the registry since
2006
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

1400 Florida Ave Ste 109
Modesto, CA 95350-4422
Phone: (209) 544-2910
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence A81212 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A81212 (CA)

Record details

NPI number1679539415
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 21, 2006
Last updated in NPPESAugust 2, 2011
Mailing address1400 Florida Ave, Suite 109, Modesto, CA 95350-4422

Medicare enrollment

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

Medicare specialtyNEPHROLOGY
Medical schoolALBANY MEDICAL COLLEGE OF UNION UNIVERSITY
Graduated 1998 (28 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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