CHAGAI MENDELSON MD
NPI 1497250120
Internal Medicine in Washington, DC

Q: What is Chagai Mendelson's NPI number?

The NPI number for Chagai Mendelson is 1497250120. It was assigned to this individual provider in the NPPES registry on March 26, 2018.

Q: What is Chagai Mendelson'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 Chagai Mendelson was last updated on February 15, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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 26, 2018PECOS EnrolledAccepts Medicare Assignment

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

NPPES record last updated: February 15, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Chagai Mendelson Md NPPES

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

CHAGAI MENDELSON MD (NPI 1497250120) is an individual internal medicine provider in Washington, District Of Columbia, licensed in Virginia (0101267724) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, is affiliated with Inova Loudoun Hospital, and is a graduate of Georgetown University School Of Medicine (2018).

NPPES Registry Identity

NPI1497250120

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameCHAGAI MENDELSONCredential: 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 ProprietorYes

Medical School CMSGeorgetown University School Of MedicineGraduated 2018

Enumeration DateMarch 26, 2018

Last NPPES UpdateFebruary 15, 2024

NPPES CertifiedFebruary 15, 2024

✔ NPI 1497250120 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in VA · 0101267724

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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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Chagai Mendelson Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID345599460

PECOS Enrollment IDI20240819000456, I20240828001306

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.

Medicare Billing Reassignments

Medicare enrollment records show Chagai Mendelson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Privia Medical Group, LLC

3.0 mi

Internal Medicine

950 N GLEBE RD STE 700
Arlington, VA 22203

Reassigned Medicare billing, District of Columbia and Virginia enrollments
1,534 clinicians in this Medicare group

NPI 1013042480 (571) 366-8850

Reston Hospital Center, LLC

16 mi

Radiologic Technologist

1850 TOWN CENTER PKWY
Reston, VA 20190

Reassigned Medicare billing, District of Columbia enrollment
32 clinicians in this Medicare group

NPI 1548617863 (703) 689-9000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 22

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, regadenoson, 0.1 mg J2785

Regadenoson injection, 0.1 mg, is a medication used to help visualize the heart during a stress test. It works by increasing blood flow in the arteries of the heart. It's injected into a vein and is generally well-tolerated.

150 services39 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

110 services107 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

68 services58 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

57 services57 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

54 services53 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision and review by physician 93015

An exercise or drug-induced heart stress test with ECG is a procedure performed by a doctor to assess how your heart responds to exertion. It involves monitoring your heart's electrical activity while you exercise or after medication is given to mimic exercise effects.

53 services53 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

51 services51 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

41 services28 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

34 services34 patients

Technetium tc-99m sestamibi, diagnostic, per study dose A9500

Technetium Tc-99m Sestamibi is a diagnostic test used to create images of your heart or breast tissues. It involves a safe radioactive substance injection that helps doctors to detect any abnormalities or changes in these tissues.

32 services29 patients

Nuclear medicine studies of heart muscle at rest and with stress and spect 78452

Nuclear medicine studies of the heart involve two parts: rest and stress. During rest, images are taken of your heart at ease. During stress, images are taken after exercise or medication-induced stress. SPECT is a special imaging technique providing 3D pictures of your heart, helping identify any issues.

29 services29 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

25 services25 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

23 services22 patients

Nuclear medicine studies of blood flow in heart muscle at rest and with stress with concurrent ct scan 78431

This is a diagnostic test where a tiny amount of radioactive material is used to examine your heart's blood flow at rest & during stress, alongside a CT scan for detailed images. It helps identify any heart-related issues like blockages or damage.

22 services22 patients

Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries A9555

Rubidium Rb-82 is a radioactive drug used in a PET scan to help visualize the heart. It helps detect areas with poor blood flow, aiding in diagnosing heart conditions. The dose is up to 60 millicuries per study.

22 services22 patients

Nuclear medicine study of heart muscle blood flow by pet 78434

A nuclear medicine study of heart muscle blood flow by PET is a non-invasive test that uses a small amount of radioactive substance to create detailed images of your heart's blood flow and function. It helps assess heart health and diagnose heart conditions.

21 services21 patients

Electrocardiogram (ecg) up to 30 days continuous with transmission of patient triggered events with review and report by health care professional 93229

An Electrocardiogram (ECG) is a test that records your heart's electrical activity for up to 30 days. You trigger a transmission if you feel symptoms, which is then reviewed by a healthcare professional. The report helps diagnose heart conditions.

20 services20 patients

Electrocardiogram (ecg) up to 30 days continuous with review and report by health care professional 93228

An Electrocardiogram (ECG) is a non-invasive test that records the electrical signals in your heart. For up to 30 days, a small device will continuously monitor your heart's activity. A healthcare professional will then review the data and provide a report on your heart's function.

19 services19 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

17 services16 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

16 services16 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

14 services14 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

13 services12 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Inova Loudoun Hospital

Acute Care Hospitals · Leesburg, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490043

Location44045 Riverside ParkwayLeesburg, VA 20176 · Loudoun County

Emergency services Birthing friendly

Inova Fairfax Hospital

Acute Care Hospitals · Falls Church, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490063

Location3300 Gallows RoadFalls Church, VA 22042 · Fairfax County

Emergency services Birthing friendly

Inova Fair Oaks Hospital

Acute Care Hospitals · Fairfax, VA

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number490101

Location3600 Joseph Siewick DriveFairfax, VA 22033 · Fairfax County

Birthing friendly

Reston Hospital Center

Acute Care Hospitals · Reston, VA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number490107

Location1850 Town Center ParkwayReston, VA 20190 · Fairfax County

Emergency services

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 Chagai Mendelson's NPI number?

The NPI number for Chagai Mendelson is 1497250120. It was assigned to this individual provider in the NPPES registry on March 26, 2018.

Where is Chagai Mendelson located?

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

What is Chagai Mendelson's specialty?

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

Is Chagai Mendelson enrolled in Medicare?

Yes. Chagai Mendelson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Chagai Mendelson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Chagai Mendelson reassigns Medicare benefits to 2 organizations: Privia Medical Group, LLC (Arlington, VA) and Reston Hospital Center, LLC (Reston, VA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Chagai Mendelson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Chagai Mendelson accept?

Health plans from Oscar Health list Chagai Mendelson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Chagai Mendelson affiliated with any hospitals?

According to CMS data, Chagai Mendelson is affiliated with Inova Loudoun Hospital, Inova Fairfax Hospital, Inova Fair Oaks Hospital and Reston Hospital Center.

When was this NPI record last updated?

The NPPES record for Chagai Mendelson was last updated on February 15, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.