Marilyn A. Maxwell, M.D.
Internal Medicine Physician · Saint Louis, MO
Marilyn A. Maxwell, M.D. is an internal medicine physician with a practice address in Saint Louis, Missouri, and NPI 1144233164, issued on Aug 14, 2006. Check the license (Missouri R1D74, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Marilyn A. Maxwell
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- R1D74 MO
Self-reported in NPPES; status is on the state search - Practice location
- 3660 Vista Ave, Saint Louis, MO 63110
- Phone
- (314) 977-6100
- Enumerated
- Aug 14, 2006
- Record last updated
- Mar 30, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (314) 977-6137
- Medicaid ID
- 202218012 MO
- Medicare enrollment
- Enrolled (PECOS I20050217000131); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 1981
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Also registered at 3660 Vista Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ali Al Balushi, M.D.Student in an Organized Health Care Education/Training Program1356750301
- Mary Barron, APRNFamily Nurse Practitioner1760600977
- Taylor BastinHospitalist Physician1205464492
- Shannon Brueggemann, MS, RDN, LDNRegistered Dietitian1679988810
- Kent Buxton, MDInternal Medicine Physician1740749746
- David Crafts, M.D.Specialist1891884870
Verify Marilyn A. Maxwell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license R1D74Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
215 Medicare Part D claims for 56 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 64 claims were for opioids.
Most prescribed
- Oxycodone-Acetaminophen20 claims
- Morphine Sulfate Er18 claims
- Tramadol Hcl15 claims
- Albuterol Sulfate Hfa13 claims
- Tamsulosin Hcl13 claims
- Amlodipine Besylate11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 81.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Ssm Health Care GroupSaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marilyn A. Maxwell among 2,604 internal medicine physician records in Missouri
Marilyn A. Maxwell, M.D. is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated1981 · median 2006 among the 1,443 with a school on file
- Record last updated2009 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
941 internal medicine physician records list a practice address in Saint Louis
They are 941 of the 27,605 NPPES records with a practice address in Saint Louis, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in Saint Louis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Bartholet, MDSaint Louis, MO 631101750325742
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- Mohammed Haque, MDSaint Louis, MO 631101689604100
- Charles Lieu, MDSaint Louis, MO 631101871510396
- Kenneth Ludmerer, MDSaint Louis, MO 631101366468597
- Barbara Lutey, MDSaint Louis, MO 631101306862628
- Heidi Miller, M.D.Saint Louis, MO 631101922082361
- Tracy Norfleet, MDSaint Louis, MO 631101487680377
Common questions
What is Marilyn A. Maxwell, M.D.'s NPI number?
Marilyn A. Maxwell, M.D.'s National Provider Identifier (NPI) is 1144233164, issued on Aug 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marilyn A. Maxwell, M.D. located?
The NPPES record lists a practice address at 3660 Vista Ave, Saint Louis, MO, 63110. Phone: (314) 977-6100. Providers update this record themselves, so call before visiting.
How can I verify Marilyn A. Maxwell, M.D.'s license?
NPPES lists Missouri license number R1D74, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marilyn A. Maxwell, M.D. prescribe under Medicare Part D?
In 2024, Marilyn A. Maxwell, M.D. had 215 Medicare Part D claims for 56 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Marilyn A. Maxwell, M.D.'s MIPS final score?
The 2023 MIPS final score is 81.6 of 100, reported for the practice group. 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.