MR. STEPHEN W MARER MD
NPI 1043281322
Internal Medicine - Infectious Disease in Los Angeles, CA

Active since January 27, 2006PECOS EnrolledAccepts Medicare Assignment
1520 SAN PABLO ST STE 1000, LOS ANGELES, CA 90033(323) 442-5100 Get Directions Write a Review

NPPES record last updated: November 3, 2022. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Mr. Stephen W Marer Md NPPES

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

MR. STEPHEN W MARER MD (NPI 1043281322) is an individual infectious disease provider in Los Angeles, California, licensed in California (A55306) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Torrance, and is a graduate of University Of California, Davis School Of Medicine (1994).

NPPES Registry Identity

NPI1043281322
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameMR. STEPHEN W MARERCredential: MD
Location Address1520 SAN PABLO ST STE 1000Los Angeles, CA 90033-5312
Mailing AddressPo Box 31309Los Angeles, CA 90031-0309 · (323) 442-5100
Sole ProprietorNo
Medical School CMSUniversity Of California, Davis School Of MedicineGraduated 1994
Enumeration DateJanuary 27, 2006
Last NPPES UpdateNovember 3, 2022
NPPES CertifiedNovember 3, 2022
NPI 1043281322 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License Licensed in CA · A55306
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
Also ListedInternal MedicineTaxonomy 207R00000X · License A55306 (CA)
1520 SAN PABLO ST STE 1000, Los Angeles, CA 90033

Secondary Practice Location 1

Location 13400 Lomita Blvd, Ste 104Torrance, CA 90505 · Phone (310) 326-5648 · Fax (310) 326-5679

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

Enrolled in Medicare and accepts Medicare assignment

Mr. Stephen W Marer 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 ID9335171032
PECOS Enrollment IDI20050901000879
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.

Areas of Expertise CMS Part B claims 5

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.

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.
355 services150 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.
208 services117 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
133 services129 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
79 services75 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.
20 services20 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90033 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 20

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

Internal Medicine (Cardiovascular Disease)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Internal Medicine (Hospice and Palliative Medicine)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Internal Medicine (Nephrology)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Internal Medicine (Gastroenterology)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Internal Medicine (Infectious Disease)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Nurse Practitioner
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Nurse Practitioner (Family)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033
Internal Medicine (Nephrology)
1520 SAN PABLO ST STE 1000
LOS ANGELES, CA 90033

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 Stephen Marer's NPI number?

The NPI number for Stephen Marer is 1043281322. It was assigned to this individual provider in the NPPES registry on January 27, 2006.

Where is Stephen Marer located?

Stephen Marer practices at 1520 San Pablo St Ste 1000, Los Angeles, CA 90033. The listed phone number is (323) 442-5100.

What is Stephen Marer's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Stephen Marer enrolled in Medicare?

Yes. Stephen Marer 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.

When was this NPI record last updated?

The NPPES record for Stephen Marer was last updated on November 3, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.