Alaina Justine Kessler, MD
Medical Oncology Physician · Saint Louis, MO
Alaina Justine Kessler, MD is a medical oncology physician with a practice address in Saint Louis, Missouri, and NPI 1043697063, issued on Apr 28, 2015. Check the license (Missouri 2025017003, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Alaina Justine Kessler
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 2025017003 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (800) 647-2098
- Enumerated
- Apr 28, 2015
- Record last updated
- Jun 6, 2025
- Fax
- (314) 362-3192
- Medicare enrollment
- Enrolled (PECOS I20250721001015); accepts Medicare assignment
- Medical or professional school
- University Of Connecticut School Of Medicine, 2015
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 156 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jewish Hospital Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Alaina Justine Kessler 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 2025017003Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average medical oncology physician in 2024
447 Medicare Part D claims for 167 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Anastrozole239 claims
- Tamoxifen Citrate65 claims
- Letrozole62 claims
- Exemestane47 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.
Bills Medicare through 2 group practices
- Washington UniversitySaint Louis, MO
- Washington University Physicians IN Illinois IncBelleville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alaina Justine Kessler among 156 medical oncology physician records in Missouri
Alaina Justine Kessler, MD is one of 156 medical oncology physician records with a practice address in Missouri. 92% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 80% of them.
- NPI issued2015 · 80% of these records are older, 17% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2015 · median 2003 among the 127 with a school on file
- Record last updated2025 · 23% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Missouri
There are 156 medical oncology physician records in Missouri.
All 156 in Missouri → Every provider in Saint Louis → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Maria Baggstrom, MDSaint Louis, MO 631101679599971
- Milan Chheda, MDSaint Louis, MO 631101902852494
- Ramaswamy Govindan, MDSaint Louis, MO 631101023034261
- Brad Kahl, MDSaint Louis, MO 631101407822430
- Timothy Ley, MDSaint Louis, MO 631101447278874
- Cynthia Ma, MDSaint Louis, MO 631101104842400
- Loren Michel, MDSaint Louis, MO 631101306862545
- Daniel Morgensztern, MDSaint Louis, MO 631101154379915
Common questions
What is Alaina Justine Kessler, MD's NPI number?
Alaina Justine Kessler, MD's National Provider Identifier (NPI) is 1043697063, issued on Apr 28, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Alaina Justine Kessler, MD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (800) 647-2098. Providers update this record themselves, so call before visiting.
How can I verify Alaina Justine Kessler, MD's license?
NPPES lists Missouri license number 2025017003, 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 Alaina Justine Kessler, MD prescribe under Medicare Part D?
In 2024, Alaina Justine Kessler, MD had 447 Medicare Part D claims for 167 beneficiaries; the average among medical oncology physician prescribers was 703. 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.