Mark T. Sullivan, PA-C
Physician Assistant · Billings, MT
Mark T. Sullivan, PA-C is a physician assistant with a practice address in Billings, Montana, and NPI 1952393514, issued on Aug 19, 2005. Check the license (Montana 205, as entered in NPPES) with the Montana board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark T. Sullivan
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 205 MT
Self-reported in NPPES; status is on the state search - Practice location
- 2900 12TH Ave N, Billings, MT 59101
- Phone
- (406) 238-6540
- Enumerated
- Aug 19, 2005
- Record last updated
- Apr 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (406) 238-6599
- Medicaid IDs
- 435438 MT
119184500 WY - Medicare enrollment
- Enrolled (PECOS I20111228000147); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 698 in Montana → Look up another NPI →
Also registered at 2900 12TH Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark T. Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Montana board licenses this profession
Search for license 205Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average physician assistant in 2024
520 Medicare Part D claims for 246 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 190 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen97 claims
- Doxycycline Monohydrate79 claims
- Gabapentin68 claims
- Meloxicam63 claims
- Tramadol Hcl45 claims
- Oxycodone Hcl29 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $21.39
1 payment: food and beverage; the largest payer was Saluda Medical Americas, Inc. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Ortho Montana, PscBillings, MT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark T. Sullivan among 698 physician assistant records in Montana
Mark T. Sullivan, PA-C is one of 698 physician assistant records with a practice address in Montana. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1999 · median 2016 among the 514 with a school on file
- Record last updated2008 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
170 physician assistant records list a practice address in Billings
They are 170 of the 4,035 NPPES records with a practice address in Billings, and 698 physician assistant records in Montana.
All 698 in Montana → Every provider in Billings → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Susan Cerovski, PABillings, MT 591011891771622
- Linda Dupree, PACBillings, MT 591011073516167
- John Etchart, PA-CBillings, MT 591011124010830
- Kathryn Hall, PA-CBillings, MT 591011366438285
- Myrna Mentikov, PA-CBillings, MT 591011750377735
- Lisa Murray, PA-CBillings, MT 591011821084369
- Deanna Niles, PA-CBillings, MT 591011881666261
- Mark Pierson, PA-CBillings, MT 591011508858234
Common questions
What is Mark T. Sullivan, PA-C's NPI number?
Mark T. Sullivan, PA-C's National Provider Identifier (NPI) is 1952393514, issued on Aug 19, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark T. Sullivan, PA-C located?
The NPPES record lists a practice address at 2900 12TH Ave N, Billings, MT, 59101. Phone: (406) 238-6540. Providers update this record themselves, so call before visiting.
How can I verify Mark T. Sullivan, PA-C's license?
NPPES lists Montana license number 205, as entered by the provider. Search the Montana board that licenses this profession; the NPPES record confirms identity only.
How much does Mark T. Sullivan, PA-C prescribe under Medicare Part D?
In 2024, Mark T. Sullivan, PA-C had 520 Medicare Part D claims for 246 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.