Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark T. Fahlen, MD, Inc a Professional Medical Corporation

Organization Nephrology Physician · NPI 1659537264

Mark T. Fahlen, MD, Inc a Professional Medical Corporation provides Nephrology Physician services in Modesto, California. Licensed in California. Registered with an NPI since 2008.

Licensed in
CA
In the registry since
2008
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1400 Florida Ave Ste 109
Modesto, CA 95350-4422 Not confirmed with CMS for 15 years — call before visiting
Phone: (209) 544-2910
Fax: (209) 544-2253
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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)

Record details

NPI number1659537264
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Fahlen — President · (209) 544-2910
NPI enumeratedAugust 3, 2008
Last updated in NPPESAugust 2, 2011
Mailing address1400 Florida Ave, Suite 109, Modesto, CA 95350-4422

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