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

Individual provider Physician Assistant · NPI 1952393514

Mark T Sullivan, PA-C is a Physician Assistant in Billings, Montana. Qualified in 1999, 27 years ago. Practices with Ortho Montana, PSC, a 41-clinician group and accepts Medicare assignment. Licensed in Montana.

Years since qualifying
27
Licensed in
MT
In the registry since
2005
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

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Practice location Address checks out

2900 12th Ave N Ste 140W
Billings, MT 59101-7506
Phone: (406) 238-6540
Fax: (406) 238-6599
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 205 (MT)

Record details

NPI number1952393514
Entity typeIndividual (Type 1)
GenderMale
Credentials PA-C
Sole proprietorNo
NPI enumeratedAugust 19, 2005
Last updated in NPPESApril 29, 2008
Mailing address2900 12th Ave N, Suite 140w, Billings, MT 59101-7506

Medicare enrollment

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

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 1999 (27 years in practice)
Group practice Ortho Montana, Psc — 41 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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