Jacob C. Marshall, M.D.
Family Medicine Physician · O Fallon, IL
Jacob C. Marshall, M.D. is a family medicine physician with a practice address in O Fallon, Illinois, and NPI 1922081249, issued on Nov 21, 2005. Check the license (Illinois 036102192, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Jacob C. Marshall
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 036102192 IL
036-102192 IL
Self-reported in NPPES; status is on the state search - Practice location
- 103 N Oak St, O Fallon, IL 62269
- Phone
- (888) 577-6337
- Enumerated
- Nov 21, 2005
- Record last updated
- Jul 12, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid IDs
- 036102192 IL
036102192 -8 IL
036102192-9 IL
1922081249 MO - Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
Also registered at 103 N Oak St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jacob C. Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036102192Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average family medicine physician in 2024
98 Medicare Part D claims for 57 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
The MIPS final score for 2023 (Medicare payment program): 95 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Jacob C. Marshall among 6,215 family medicine physician records in Illinois
Jacob C. Marshall, M.D. is one of 6,215 family medicine physician records with a practice address in Illinois. 78% 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, 91% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2010 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
44 family medicine physician records list a practice address in O Fallon
They are 44 of the 1,077 NPPES records with a practice address in O Fallon, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in O Fallon → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Robert Garner, DOShiloh, IL 622691285612242
- Marjorie Guthrie, M.D.O Fallon, IL 622691366490146
- Nell Hennon, D.O.O Fallon, IL 622691992739221
- James Hitchcock, D.O.Shiloh, IL 622691295725174
- James Lundy, MDO Fallon, IL 622691245287085
- David McCarthy, MDO Fallon, IL 622691346242799
- Scott Morrison, MDO Fallon, IL 622691508858713
- James NeedlesO Fallon, IL 622691457318297
Common questions
What is Jacob C. Marshall, M.D.'s NPI number?
Jacob C. Marshall, M.D.'s National Provider Identifier (NPI) is 1922081249, issued on Nov 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jacob C. Marshall, M.D. located?
The NPPES record lists a practice address at 103 N Oak St, O Fallon, IL, 62269. Phone: (888) 577-6337. Providers update this record themselves, so call before visiting.
How can I verify Jacob C. Marshall, M.D.'s license?
NPPES lists Illinois license number 036102192, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jacob C. Marshall, M.D. prescribe under Medicare Part D?
In 2024, Jacob C. Marshall, M.D. had 98 Medicare Part D claims for 57 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Jacob C. Marshall, M.D.'s MIPS final score?
The 2023 MIPS final score is 95 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.