Mark T. Sullivan, PA-C
- Medicare patients, 2024
- 366
- Part D claims, 2024
- 520
- Hospital affiliations
- 1
- Medical groups
- 2
- State license
- 1
- Practice address
- 2900 12th Ave N Ste 140w, Billings, MT 59101
- Practice phone
- Call (406) 237-5050
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ortho Montana Rehabilitation Center
Physical Therapy Clinic · Billings, Montana
Find Mark Sullivan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Mark T. Sullivan is a physician assistant in Billings, Montana
Mark Sullivan practices at Ortho Montana Rehabilitation Center in Billings, Montana.
Mark Sullivan's NPI, 1952393514, was assigned on August 19, 2005. Mark Sullivan holds Montana license 205.
- NPI
- 1952393514NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113063470
- NPI enumeration date
- August 19, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (406) 237-5050
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Mark T. Sullivan practices at Ortho Montana Rehabilitation Center in Billings, Montana
Mark Sullivan's primary practice is Ortho Montana Rehabilitation Center, at 2900 12th Ave N Ste 140w, Billings, MT 59101. The practice phone is (406) 237-5050.
- Ortho Montana Rehabilitation Center2900 12th Ave N Ste 140w, Billings, MT 59101Phone(406) 237-5050
Source: Dmand AI Affiliation Data
Mark T. Sullivan is affiliated with 3 sites of care and 2 medical groups
Mark Sullivan's primary practice is Ortho Montana Rehabilitation Center in Billings, Montana. Mark Sullivan is also affiliated with St. Vincent Regional Hospital. The medical group on file is Ortho Montana Orthopedics & Sports Medicine, P.C. Dmand AI also links Mark Sullivan to 1 more group practice or clinic and 1 medical group, each named with a free account. Mark Sullivan's employer is on file too: a physical therapy & rehab clinic.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Mark T. Sullivan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Sullivan practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ortho Montana Rehabilitation Center | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Mark T. Sullivan is one of 656 physician assistants in Montana
Physician assistant is Mark Sullivan's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Mark Sullivan is licensed in Montana.
Specialties and state licenses
- Physician assistant, MontanaPrimary
Physician assistants near Mark Sullivan
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Mark T. Sullivan treated 366 Medicare patients in 2024, average age 73
CMS counts 366 Medicare patients who saw Mark Sullivan in 2024. The largest group is 65 to 74, with 208 patients. 75% of them have arthritis, and 70% have high blood pressure. 6% are also on Medicaid. Their average risk score is 0.95, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Mark Sullivan's median patient age at 64, with 64% women.
Mark Sullivan's Medicare patients by age, 2024
Mark Sullivan's Medicare patients by sex, 2024
- Women21559%
- Men15141%
Chronic conditions among Mark Sullivan's Medicare patients, 2024
- Arthritis75%
- High blood pressure70%
- High cholesterol60%
- Mood disorders25%
- Anxiety23%
- Depression23%
- Diabetes23%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Mark Sullivan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women64%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mark T. Sullivan wrote 520 Medicare Part D claims in 2024
In 2024, Mark Sullivan wrote 520 Medicare Part D claims for 246 patients. 99% of them were for generic drugs.
Mark Sullivan's Part D claims by kind of drug, 2024
- Generic516 claims99%
- Brand-name and other4 claims1%
Drug classes CMS tracks in Mark Sullivan's Part D claims, 2024
- Opioids37%190 of 520 claims
- Antibiotics17%88 of 520 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Mark T. Sullivan takes part in Medicare
Mark Sullivan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Sources for Mark T. Sullivan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Mark T. Sullivan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark T. Sullivan's NPI number?
Mark T. Sullivan's NPI number is 1952393514. It was assigned on August 19, 2005, and it is active in the NPI Registry.
What does Mark T. Sullivan specialize in?
Mark T. Sullivan is a physician assistant in Billings, Montana. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Mark T. Sullivan practice?
Mark Sullivan practices at 2900 12th Ave N Ste 140w, Billings, MT 59101. Mark Sullivan's primary practice is Ortho Montana Rehabilitation Center in Billings, Montana. Dmand AI also links Mark Sullivan to 1 group practice or clinic and 1 medical group.
What is Mark T. Sullivan's office phone number?
The practice phone on file for Mark Sullivan is (406) 237-5050.
What is Mark T. Sullivan's medical license number?
Mark Sullivan holds Montana license 205.
Which hospitals is Mark T. Sullivan affiliated with?
Mark Sullivan is affiliated with St. Vincent Regional Hospital.
What medical group is Mark T. Sullivan part of?
Mark Sullivan is linked to Ortho Montana Orthopedics & Sports Medicine, P.C. Dmand AI links Mark Sullivan to 1 more medical group.
Does Mark T. Sullivan accept Medicare?
Yes. CMS lists Mark Sullivan as accepting Medicare assignment.
How many Medicare patients does Mark T. Sullivan see?
CMS counts 366 Medicare patients who saw Mark Sullivan in 2024, with an average age of 73.
How long has Mark T. Sullivan been practicing?
Mark Sullivan graduated from medical school in 1999, 27 years ago.
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