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

Mark Brennan, DO

Individual provider Surgery Physician · NPI 1174523443

Mark Brennan, DO is a Vascular Surgery in Johnson City, New York. Graduated from Philadelphia College of Osteopathic Medicine in 1994, 32 years ago. Practices with United Health Services Hospitals, Inc, a 472-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
32
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
NY
In the registry since
2005
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

30 Harrison St Ste 455
Johnson City, NY 13790-2161
Phone: (607) 763-8100
Fax: (607) 763-8048
Show map & directions

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

Specialties & licences

Vascular Surgery Physician (primary) Taxonomy 2086S0129X · Licence 217717 (NY)
Surgery Physician Taxonomy 208600000X · Licence 217717 (NY)

Record details

NPI number1174523443
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 28, 2005
Last updated in NPPESSeptember 15, 2014
Mailing address346 Grand Ave, United Medical Associates, Pc, Johnson City, NY 13790-2558

Medicare enrollment

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

Medicare specialtyVASCULAR SURGERY
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 1994 (32 years in practice)
Group practice United Health Services Hospitals, Inc. — 472 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Other providers in Johnson City