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

ETHAN DIAMOND MD
NPI 1639873102
Internal Medicine in Washington, DC

Q: What is Ethan Diamond's NPI number?

The NPI number for Ethan Diamond is 1639873102. It was assigned to this individual provider in the NPPES registry on March 29, 2023.

Q: What is Ethan Diamond's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Ethan Diamond was last updated on August 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since March 29, 2023PECOS Enrolled

3800 RESERVOIR RD NW DEPT OF, WASHINGTON, DC 20007(202) 444-8168(877) 303-1460 Get Directions Write a Review

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

Record update history: Aug 6, 2026, Mar 29, 2023 (2 updates tracked since 2023).

On this page

About Ethan Diamond Md NPPES

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

ETHAN DIAMOND MD (NPI 1639873102) is an individual internal medicine provider in Washington, District Of Columbia, licensed in District Of Columbia (MD600006067) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1639873102

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameETHAN DIAMONDCredential: MD

Location Address3800 RESERVOIR RD NW DEPT OFWashington, DC 20007-2113

Mailing Address3800 Reservoir Rd Nw Dept OfWashington, DC 20007-2113 · (202) 444-8168 · Fax (877) 303-1460

Phone(202) 444-8168

Fax(877) 303-1460

Sole ProprietorNo

Enumeration DateMarch 29, 2023

Last NPPES UpdateAugust 6, 20262 updates tracked since enumeration

NPPES CertifiedAugust 6, 2026

✔ NPI 1639873102 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in DC · MD600006067

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

3800 RESERVOIR RD NW DEPT OF, Washington, DC 20007

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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)

Ethan Diamond Md 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 20007 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

$147.85 typical visit price

range $65.18 – $194.86

Typical copayment $36.96 (range $16.29 – $48.71)

Most-billed visit code 99204

Established Patient

$113.72 typical visit price

range $21.40 – $158.88

Typical copayment $28.43 (range $5.35 – $39.72)

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.

CHARLOTTE CANTRELL HOUSTON MD

Urology

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-4922

DR. JENNA BEKENY MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-7563

ERIKA GRETEL FLEMING MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 741-1250

JEFFREY RISKIN MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

DR. SARA KIPARIZOSKA MD

Internal Medicine

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

DR. GREGORY THOMAS PERRAUT MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8766

DR. BENJAMIN KARL SUEHLER MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-3314

SAM W POSTMA MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF, DEPARTMENT OF ANESTHESIOLOGY
WASHINGTON, DC 20007

District of Columbia (202) 444-8556

DR. MAHDI BARKHORDAR MD

Pediatrics

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 741-1250

SHANDIZ SHAHBAZI

Internal Medicine (Gastroenterology)

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

BRETT MAKANA WILL MD

Internal Medicine

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

YOSHINORI TAKEDA DO

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 784-3400

DR. ANNETTE CORINA FARIA PENA MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 243-3400

ENAT AYELE MD

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 741-1250

BRIAN LEE CHANG MD

General Practice

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-7563

NINA KRISTINE WEAVER

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

MAJA CERA GRACE WICHHART DONZO

Student in an Organized Health Care Education/Training Program

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 741-1250

ANVI GADANI M.D.

Psychiatry & Neurology (Neurology)

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-1037

DR. BHAVIK GUPTA DO

Internal Medicine

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-8168

JONATHAN LISCHALK M.D.

Radiology (Radiation Oncology)

3800 RESERVOIR RD NW DEPT OF
WASHINGTON, DC 20007

District of Columbia (202) 444-3320

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 Ethan Diamond's NPI number?

The NPI number for Ethan Diamond is 1639873102. It was assigned to this individual provider in the NPPES registry on March 29, 2023.

Where is Ethan Diamond located?

Ethan Diamond practices at 3800 Reservoir Rd NW Dept Of, Washington, DC 20007. The listed phone number is (202) 444-8168.

What is Ethan Diamond's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Ethan Diamond enrolled in Medicare?

Yes. Ethan Diamond is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Ethan Diamond was last updated on August 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.