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

Dr. Mark Oldendorf, MD

Individual provider Adult Medicine Physician · NPI 1427147800

Dr. Mark Oldendorf, MD is an Internal Medicine in Loudonville, New York. Graduated from Albany Medical College of Union University in 1976, 50 years ago. Practices with Oldendorf Medical Services PLLC, an 8-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
50
Trained at
Albany Medical College of Union University
Licensed in
NY
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.

See every abbreviation used in this directory →

Practice location Address checks out

407 Albany Shaker Rd Ste 100
Loudonville, NY 12211-1902
Phone: (518) 435-1300
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 146168 (NY)
Adult Medicine Physician Taxonomy 207QA0505X · Licence 146168 (NY)

Record details

NPI number1427147800
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 12, 2006
Last updated in NPPESFebruary 7, 2019
Mailing address407 Albany Shaker Rd, Loudonville, NY 12211-1900

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolALBANY MEDICAL COLLEGE OF UNION UNIVERSITY
Graduated 1976 (50 years in practice)
Group practice Oldendorf Medical Services Pllc — 8 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services