Maria Louise O'Neill, M.D.
Anesthesiology Physician · Saint Louis, MO
Maria Louise O'Neill, M.D. is an anesthesiology physician with a practice address in Saint Louis, Missouri, and NPI 1669435434, issued on Apr 11, 2006. Check the license (Missouri R3F73, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Maria Louise O'Neill
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- R3F73 MO
Self-reported in NPPES; status is on the state search - Practice location
- 615 S New Ballas RD, Saint Louis, MO 63141
- Phone
- (314) 469-6800
- Enumerated
- Apr 11, 2006
- Record last updated
- Nov 20, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (314) 469-6803
- Medicaid ID
- 205796709 MO
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,153 in Missouri → Look up another NPI →
Also registered at 615 S New Ballas RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Wael Abduljaber, MDInternal Medicine Physician1174101489
- Frederick Abele, M.D.Anesthesiology Physician1346245354
- Jane Abele, CRNACertified Registered Nurse Anesthetist1578564647
- Joy Abu-Shanab, PHARM. D, BCPSPharmacotherapy Pharmacist1568532216
- Yaseen Adam, MDHospitalist Physician1932278587
Verify Maria Louise O'Neill 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 R3F73Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average anesthesiology physician in 2024
55 Medicare Part D claims, against an average of 402 among the 4,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Atorvastatin Calcium13 claims
- Amlodipine Besylate12 claims
- Pantoprazole Sodium12 claims
- Valsartan12 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.
Maria Louise O'Neill among 1,153 anesthesiology physician records in Missouri
Maria Louise O'Neill, M.D. is one of 1,153 anesthesiology physician records with a practice address in Missouri. 70% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2008 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
490 anesthesiology physician records list a practice address in Saint Louis
They are 490 of the 27,605 NPPES records with a practice address in Saint Louis, and 1,153 anesthesiology physician records in Missouri.
All 1,153 in Missouri → Every provider in Saint Louis → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Linda Algra, M.D.Saint Louis, MO 631411568467959
- Jay Androphy, M.D.Saint Louis, MO 631411831194034
- Donald Arnold, M.D.Saint Louis, MO 631411629073820
- Andrew Barnett, M.D.Saint Louis, MO 631411932104130
- Sean Elliott, D.O.St Louis, MO 631411134124076
- Christopher Erkmann, M.D.St Louis, MO 631411295730133
- Robert Forstot, M.D.St Louis, MO 631411740285683
- Joann Galakatos, M.D.St Louis, MO 631411659376598
Common questions
What is Maria Louise O'Neill, M.D.'s NPI number?
Maria Louise O'Neill, M.D.'s National Provider Identifier (NPI) is 1669435434, issued on Apr 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maria Louise O'Neill, M.D. located?
The NPPES record lists a practice address at 615 S New Ballas RD, Saint Louis, MO, 63141. Phone: (314) 469-6800. Providers update this record themselves, so call before visiting.
How can I verify Maria Louise O'Neill, M.D.'s license?
NPPES lists Missouri license number R3F73, 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 Maria Louise O'Neill, M.D. prescribe under Medicare Part D?
In 2024, Maria Louise O'Neill, M.D. had 55 Medicare Part D claims; the average among anesthesiology physician prescribers was 402. 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.