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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. JENNIFER ELIZABETH LONG DIAZ MD PHD
NPI 1073192118
Internal Medicine - Medical Oncology in Saint Louis, MO

Active since April 06, 2021PECOS Enrolled
1 BARNES JEWISH HOSPITAL PLZ, DIV IM MEDICAL ONCOLOGY, SAINT LOUIS, MO 63110(314) 747-1171(314) 362-7086 Get Directions Write a Review

NPPES record last updated: July 6, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 6, 2026, Jul 17, 2023, Apr 6, 2021 (3 updates tracked since 2021).

About Dr. Jennifer Elizabeth Long Diaz Md Phd NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JENNIFER ELIZABETH LONG DIAZ MD PHD (NPI 1073192118) is an individual medical oncology provider in Saint Louis, Missouri, licensed in Missouri (2024023248) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1073192118
Entity TypeIndividualFemale
Primary Taxonomy207RX0202X
Provider Legal NameDR. JENNIFER ELIZABETH LONG DIAZCredential: MD PHD
Location Address1 BARNES JEWISH HOSPITAL PLZ, DIV IM MEDICAL ONCOLOGYSaint Louis, MO 63110-1003
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 747-1171 · Fax (314) 362-7086
Phone(314) 747-1171
Fax(314) 362-7086
Sole ProprietorNo
Enumeration DateApril 6, 2021
Last NPPES UpdateJuly 6, 20263 updates tracked since enumeration
NPPES CertifiedJuly 17, 2023
✔ NPI 1073192118 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in MO · 2024023248
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
Also ListedInternal MedicineTaxonomy 207R00000X · License 2024023248 (MO)
1 BARNES JEWISH HOSPITAL PLZ, Saint Louis, MO 63110
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Jennifer Elizabeth Long Diaz Md Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$169.38 typical visit price
range $55.65 – $169.38
Typical copayment $42.34 (range $13.91 – $42.34)
Most-billed visit code 99205
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. MARGARET LEIGHTON MCNAIRY MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
ANNA RABINOV ANNA RABINOV
Obstetrics & Gynecology
1 BARNES JEWISH HOSPITAL PLZ
SAINT LOUIS, MO 63110
St. Louis City (314) 747-3000
MRS. MICHELLE MARIE BLOOM ACNP
Nurse Practitioner (Acute Care)
1 BARNES JEWISH HOSPITAL PLZ, DEPT ANESTHESIOLOGY
SAINT LOUIS, MO 63110
St. Louis City (800) 862-9980
DR. FARIS ADAM BAKEER MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. REHAN RAIS MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. RANDY OLIVIER LAINE MD
Hospitalist
1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST
SAINT LOUIS, MO 63110
St. Louis City (314) 362-1700
DR. BRADLEY SETH KUSHNER MD
Surgery
1 BARNES JEWISH HOSPITAL PLZ, DIV SURG VASCULAR
SAINT LOUIS, MO 63110
St. Louis City (314) 273-7373
MS. KELSEY ELISE FOGUS CRNA
Nurse Anesthetist, Certified Registered
1 BARNES JEWISH HOSPITAL PLZ, DEPT ANESTHESIOLOGY
SAINT LOUIS, MO 63110
St. Louis City (800) 862-9980

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Jennifer Diaz's NPI number?

The NPI number for Jennifer Diaz is 1073192118. It was assigned to this individual provider in the NPPES registry on April 6, 2021.

Where is Jennifer Diaz located?

Jennifer Diaz practices at 1 Barnes Jewish Hospital Plz Div Im Medical Oncology, Saint Louis, MO 63110. The listed phone number is (314) 747-1171.

What is Jennifer Diaz's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Jennifer Diaz enrolled in Medicare?

Yes. Jennifer Diaz is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Jennifer Diaz was last updated on July 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.