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GEORGE LEONARD MARKS MD
NPI 1578589602
Internal Medicine in Los Angeles, CA

Active since July 14, 2006PECOS Enrolled
866 N VERMONT AVE STE 3, LOS ANGELES, CA 90029(323) 906-0050(323) 906-0060 Get Directions Write a Review

NPPES record last updated: June 20, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About George Leonard Marks Md NPPES

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

GEORGE LEONARD MARKS MD (NPI 1578589602) is an individual internal medicine provider in Los Angeles, California, licensed in California (C39879) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Perelman School Of Med At The University Of Pennsylvania (1976).

NPPES Registry Identity

NPI1578589602
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameGEORGE LEONARD MARKSCredential: MD
Location Address866 N VERMONT AVE STE 3Los Angeles, CA 90029-3587
Mailing Address866 N Vermont Ave Ste 3Los Angeles, CA 90029-3587 · (323) 906-0050 · Fax (323) 906-0060
Phone(323) 906-0050
Fax(323) 906-0060
Sole ProprietorYes
Medical School CMSPerelman School Of Med At The University Of PennsylvaniaGraduated 1976
Enumeration DateJuly 14, 2006
Last NPPES UpdateJune 20, 2011
✔ NPI 1578589602 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · C39879
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.
866 N VERMONT AVE STE 3, Los Angeles, CA 90029
Open in Google Maps ↗

Other Identifiers 2

Medicare UPINA88144CA
Medicare ID-Type UnspecifiedC39879CA · Provider No.

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

George Leonard Marks Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6800852344
PECOS Enrollment IDI20041206001043
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 Reassignment

Medicare enrollment records show George Marks reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

County Of Los Angeles
12 mi
Clinic/Center
1670 E 120TH ST
Los Angeles, CA 90059
  • Reassigned Medicare billing, California enrollment
  • 435 clinicians in this Medicare group
NPI 1780877613 (310) 668-5201

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 6

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 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.
287 services123 patients
Routine electrocardiogram (ecg) using at least 12 leads with tracing 93005
An Electrocardiogram (ECG) is a simple, painless test that records the heart's electrical activity. Using 12 leads attached to your skin, it generates a tracing of your heart rhythm. It helps detect any heart problems by showing the timing and strength of electrical signals passing through each part of your heart.
255 services105 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
18 services18 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.
18 services16 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
14 services12 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.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90029 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

STEPHEN GZ AN
Acupuncturist
866 N VERMONT AVE STE 3
LOS ANGELES, CA 90029
Los Angeles County (213) 235-6273

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 George Marks's NPI number?

The NPI number for George Marks is 1578589602. It was assigned to this individual provider in the NPPES registry on July 14, 2006.

Where is George Marks located?

George Marks practices at 866 N Vermont Ave Ste 3, Los Angeles, CA 90029. The listed phone number is (323) 906-0050.

What is George Marks's specialty?

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

Is George Marks enrolled in Medicare?

Yes. George Marks is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for George Marks's services?

According to the CMS Revalidation Reassignment List (October 2026 release), George Marks reassigns Medicare benefits to County Of Los Angeles (Los Angeles, CA). The 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 George Marks's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for George Marks was last updated on June 20, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.