Marcus D. Sizemore, PA
- Part D claims, 2024
- 55
- Industry payments
- $122
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 112 North 5th Street, Barnsdall, OK 74002
- Practice phone
- Call (918) 331-1090
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension Medical Group St. John Primary Care Barnsdall
Rural Health Clinic - Independent · Barnsdall, Oklahoma
Find Marcus Sizemore'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.
Marcus D. Sizemore is a physician assistant in Tulsa, Oklahoma
Marcus Sizemore practices at Ascension Medical Group St. John Primary Care Barnsdall in Barnsdall, Oklahoma.
Marcus Sizemore's NPI, 1881686186, was assigned on August 22, 2005. Marcus Sizemore holds Oklahoma license 305.
- NPI
- 1881686186NPI Registry (opens in a new tab)
- NPI enumeration date
- August 22, 2005
- NPI status
- Active
- Practice phone
- (918) 331-1090
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Marcus D. Sizemore practices in Barnsdall and Tulsa
Marcus Sizemore's primary practice is Ascension Medical Group St. John Primary Care Barnsdall, at 112 North 5th Street, Barnsdall, OK 74002. The practice phone is (918) 331-1090. The NPI Registry lists Marcus Sizemore's practice address as 6218 S Lewis E Ave, Tulsa, OK 74136.
- Ascension Medical Group St. John Primary Care BarnsdallPrimary112 North 5th Street, Barnsdall, OK 74002Phone(918) 331-1090
- NPI Registry address6218 S Lewis E Ave, Tulsa, OK 74136 · Tulsa County
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Marcus D. Sizemore is affiliated with 1 site of care and 1 medical group
Marcus Sizemore's primary practice is Ascension Medical Group St. John Primary Care Barnsdall in Barnsdall, Oklahoma. The medical group on file is Ascension St. John.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Marcus D. Sizemore's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Marcus Sizemore practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Medical Group St. John Primary Care Barnsdall | Available with a free account |
Source: Dmand AI Technology Install Data
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Marcus D. Sizemore is one of 1,545 physician assistants in Oklahoma
Physician assistant is Marcus Sizemore's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Marcus Sizemore is licensed in Oklahoma.
Specialties and state licenses
- Physician assistant, OklahomaPrimary
Physician assistants near Marcus Sizemore
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
Marcus D. Sizemore's patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Marcus Sizemore's median patient age at 74, with 33% women.
Marcus Sizemore's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women33%
- Men67%
Source: Dmand AI Patient Panel Data
Marcus D. Sizemore wrote 55 Medicare Part D claims in 2024
In 2024, Marcus Sizemore wrote 55 Medicare Part D claims. 84% of them were for generic drugs.
Marcus Sizemore's Part D claims by kind of drug, 2024
- Generic46 claims84%
- Brand-name and other9 claims16%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Marcus D. Sizemore received $122 in industry payments in 2025
CMS Open Payments shows 1 general payment to Marcus Sizemore from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Sanofi and Genzyme US Companies paid the most, $122.
Companies that paid Marcus Sizemore the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Marcus D. Sizemore'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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 Marcus D. Sizemore
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Marcus D. Sizemore's NPI number?
Marcus D. Sizemore's NPI number is 1881686186. It was assigned on August 22, 2005, and it is active in the NPI Registry.
What does Marcus D. Sizemore specialize in?
Marcus D. Sizemore is a physician assistant in Tulsa, Oklahoma. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Marcus D. Sizemore practice?
Marcus Sizemore practices at 112 North 5th Street, Barnsdall, OK 74002. Marcus Sizemore also practices at 6218 S Lewis E Ave, Tulsa, OK 74136. Marcus Sizemore's primary practice is Ascension Medical Group St. John Primary Care Barnsdall in Barnsdall, Oklahoma.
What is Marcus D. Sizemore's office phone number?
The practice phone on file for Marcus Sizemore is (918) 331-1090.
What is Marcus D. Sizemore's medical license number?
Marcus Sizemore holds Oklahoma license 305.
What medical group is Marcus D. Sizemore part of?
Marcus Sizemore is linked to Ascension St. John.
Has Marcus D. Sizemore received payments from drug or device companies?
CMS Open Payments shows $122 in general payments to Marcus Sizemore from 1 company from 2025 to 2025. The largest total came from Sanofi and Genzyme US Companies.
How long has Marcus D. Sizemore been practicing?
Marcus Sizemore's NPI was assigned in 2005.
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