Jennifer Elizabeth Long Diaz, MD PHD
Medical Oncology Physician · Saint Louis, MO
Jennifer Elizabeth Long Diaz, MD PHD is a medical oncology physician with a practice address in Saint Louis, Missouri, and NPI 1073192118, issued on Apr 6, 2021. Check the license (Missouri 2024023248, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Jennifer Elizabeth Long Diaz
- Credential
- MD PHD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 2024023248 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (314) 747-1171
- Enumerated
- Apr 6, 2021
- Record last updated
- Jul 6, 2026
- Fax
- (314) 362-7086
- 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 Jennifer Elizabeth Long Diaz 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 2024023248Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average medical oncology physician in 2024
39 Medicare Part D claims for 12 beneficiaries, against an average of 703 among the 4,230 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.
Industry payments in 2024: $18.04
1 payment: food and beverage; the largest payer was Incyte Corporation. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Jennifer Elizabeth Long Diaz among 156 medical oncology physician records in Missouri
Jennifer Elizabeth Long Diaz, MD PHD 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 2021, is newer than over 99% of them.
- NPI issued2021 · over 99% of these records are older, 0% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileNo · 81% of these records are
- Record last updated2026 · 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 Jennifer Elizabeth Long Diaz, MD PHD's NPI number?
Jennifer Elizabeth Long Diaz, MD PHD's National Provider Identifier (NPI) is 1073192118, issued on Apr 6, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Elizabeth Long Diaz, MD PHD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (314) 747-1171. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Elizabeth Long Diaz, MD PHD's license?
NPPES lists Missouri license number 2024023248, 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 Jennifer Elizabeth Long Diaz, MD PHD prescribe under Medicare Part D?
In 2024, Jennifer Elizabeth Long Diaz, MD PHD had 39 Medicare Part D claims for 12 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.