DR. MARCUS LEJON WILLIAMS MD
NPI 1417026436
Internal Medicine - Interventional Cardiology in La Jolla, CA

Q: What is Marcus Williams's NPI number?

The NPI number for Marcus Williams is 1417026436. It was assigned to this individual provider in the NPPES registry on November 6, 2006.

Q: What is Marcus Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Interventional Cardiology, with taxonomy code 207RI0011X.

Q: When was this NPI record last updated?

The NPPES record for Marcus Williams was last updated on June 30, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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 November 06, 2006PECOS EnrolledAccepts Medicare Assignment

10666 N TORREY PINES ROAD, LA JOLLA, CA 92037(858) 554-5257 Get Directions Write a Review

NPPES record last updated: June 30, 2009. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Dr. Marcus Lejon Williams Md NPPES

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

DR. MARCUS LEJON WILLIAMS MD (NPI 1417026436) is an individual interventional cardiology provider in La Jolla, California, licensed in California (A98711) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, is affiliated with Emory University Hospital, and is a graduate of Js Weill Medical College, Cornell University (2001).

NPPES Registry Identity

NPI1417026436

Entity TypeIndividualMale

Primary Taxonomy207RI0011X

Provider Legal NameDR. MARCUS LEJON WILLIAMSCredential: MD

Location Address10666 N TORREY PINES ROADLa Jolla, CA 92037-1027

Mailing AddressFile # 54433Los Angeles, CA 90074-0001

Phone(858) 554-5257

Sole ProprietorNo

Medical School CMSJs Weill Medical College, Cornell UniversityGraduated 2001

Enumeration DateNovember 6, 2006

Last NPPES UpdateJune 30, 2009

✔ NPI 1417026436 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Interventional CardiologyAllopathic & Osteopathic Physicians

Taxonomy Code207RI0011X

License✔ Licensed in CA · A98711

Definition

An area of medicine within the subspecialty of cardiology, which uses specialized imaging and other diagnostic techniques to evaluate blood flow and pressure in the coronary arteries and chambers of the heart and uses technical procedures and medications to treat abnormalities that impair the function of the cardiovascular system.

Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X · License 054048 (GA)

10666 N TORREY PINES ROAD, La Jolla, CA 92037

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Other Identifiers 3

OtherJ005CA · Champus

Medicare PINBC207CA

Medicaid854728375AGA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Absolute Total Care, Ambetter Health, Ambetter of Alabama and more.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

Dr. Marcus Lejon Williams 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 ID3971503301

PECOS Enrollment IDI20070108000413

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 Marcus Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Emory Specialty Associates, LLC

1,864 mi

Anesthesiology

303 SMITH ST
Lagrange, GA 30240

Reassigned Medicare billing, Georgia enrollment
1,506 clinicians in this Medicare group

NPI 1407864168 (404) 778-4888

Tift Regional Health System Inc

1,969 mi

School

1464 CARPENTER ROAD S
Tifton, GA 31793

Reassigned Medicare billing, Georgia enrollment
380 clinicians in this Medicare group

NPI 1508428442 (229) 353-2227

Tift Regional Health System Inc

1,971 mi

Physical Medicine & Rehabilitation

2227 US HIGHWAY 41 N
Tifton, GA 31794

Reassigned Medicare billing, Georgia enrollment
337 clinicians in this Medicare group

NPI 1396095428 (229) 386-4200

Coffee Regional Medical Center, Inc

2,007 mi

Anesthesiology

1101 OCILLA RD
Douglas, GA 31533

Reassigned Medicare billing, Georgia enrollment
72 clinicians in this Medicare group

NPI 1437120946 (912) 384-1900

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 30

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.

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.

1,046 services385 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

699 services481 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.

425 services308 patients

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.

361 services89 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.

319 services301 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.

209 services104 patients

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

157 services155 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.

116 services114 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.

113 services111 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.

63 services63 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

57 services55 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.

50 services50 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

46 services43 patients

Ultrasound of leg arteries or artery grafts 93925

An ultrasound of leg arteries or artery grafts is a non-invasive imaging test. It uses high-frequency sound waves to capture live images from inside your body, specifically your leg arteries or grafts. This helps in detecting any blockages or abnormalities.

44 services44 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

35 services34 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.

34 services34 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

34 services34 patients

Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist 93458

This procedure involves placing a tube into your left lower heart chamber and coronary artery. It helps doctors diagnose heart conditions by allowing them to view these areas in detail. A radiologist will review the images to ensure accurate diagnosis.

32 services32 patients

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

30 services30 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician 93016

An exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.

30 services30 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician 93018

An exercise or drug-induced heart stress test with ECG is a procedure to assess how your heart functions under stress. It can involve exercising or medication to make your heart work harder while an ECG records its activity. A physician reviews the results.

30 services30 patients

Smoking and tobacco use intensive counseling, 4-10 minutes 99406

This service provides brief, intensive counseling (4-10 minutes) to support you in quitting smoking or tobacco use. It involves discussing the risks of tobacco use, benefits of quitting, and strategies to help you stop. It's a critical step towards a healthier lifestyle.

29 services16 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.

23 services15 patients

Programming of dual lead pacemaker system 93280

Programming of a dual lead pacemaker system is a procedure to adjust your heart's pacemaker settings. This process involves a small device, called a programmer, that communicates with your pacemaker to ensure it's working optimally for your heart's needs.

22 services17 patients

Ultrasound of both sides of head and neck blood flow 93880

22 services22 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.

21 services21 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

20 services20 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

17 services17 patients

Electrocardiogram (ecg) up to 30 days continuous with symptom monitoring, transmission and review and report by health care professional 93272

An Electrocardiogram (ECG) is a test that records the electrical activity of your heart. For up to 30 days, a device will continuously monitor your heart's rhythm, noting any symptoms. The data is sent to a healthcare professional who reviews it and provides a report on your heart health.

14 services14 patients

Ultrasound of heart, follow-up 93308

A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.

13 services13 patients

Hospital Affiliations CMS Care Compare 5

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

Emory University Hospital

Acute Care Hospitals · Atlanta, GA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number110010

Location1364 Clifton Road, NEAtlanta, GA 30322 · De Kalb County

Emergency services

Wellstar West Georgia Medical Center

Acute Care Hospitals · Lagrange, GA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number110016

Location1514 Vernon RoadLagrange, GA 30240 · Troup County

Emergency services Birthing friendly

Emory University Hospital Midtown

Acute Care Hospitals · Atlanta, GA

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number110078

Location550 Peachtree Street, NEAtlanta, GA 30308 · Fulton County

Emergency services Birthing friendly

Coffee Regional Medical Center, Inc

Acute Care Hospitals · Douglas, GA

2/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number110089

Location1101 Ocilla RoadDouglas, GA 31533 · Coffee County

Emergency services Birthing friendly

Tift Regional Medical Center

Acute Care Hospitals · Tifton, GA

2/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number110095

Location901 E 18th StreetTifton, GA 31793 · Tift County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92037 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

$140.22 typical visit price

range $62.10 – $184.71

Typical copayment $35.05 (range $15.52 – $46.17)

Most-billed visit code 99204

Established Patient

$108.42 typical visit price

range $20.62 – $151.42

Typical copayment $27.10 (range $5.15 – $37.85)

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

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

MRS. SUSAN JUENGER RD

Dietitian, Registered

10666 N TORREY PINES ROAD, SCRIPPS GREEN HOSPITAL
LA JOLLA, CA 92037

San Diego County (858) 554-3136

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 Marcus Williams's NPI number?

The NPI number for Marcus Williams is 1417026436. It was assigned to this individual provider in the NPPES registry on November 6, 2006.

Where is Marcus Williams located?

Marcus Williams practices at 10666 N Torrey Pines Road, La Jolla, CA 92037. The listed phone number is (858) 554-5257.

What is Marcus Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Interventional Cardiology, with taxonomy code 207RI0011X.

Is Marcus Williams enrolled in Medicare?

Yes. Marcus Williams 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 Marcus Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marcus Williams reassigns Medicare benefits to 4 organizations: Emory Specialty Associates, LLC (Lagrange, GA), Tift Regional Health System Inc (Tifton, GA), Tift Regional Health System Inc (Tifton, GA) and Coffee Regional Medical Center, Inc (Douglas, GA). 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 Marcus Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Marcus Williams accept?

Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 1 other insurer list Marcus Williams 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 Marcus Williams affiliated with any hospitals?

According to CMS data, Marcus Williams is affiliated with Emory University Hospital, Wellstar West Georgia Medical Center, Emory University Hospital Midtown, Coffee Regional Medical Center, Inc and Tift Regional Medical Center.

When was this NPI record last updated?

The NPPES record for Marcus Williams was last updated on June 30, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.