Physician Profile
Stephen W. Marer, MD
Unclaimed ProfileAbout Dr. Marer
Based in Los Angeles, CA, Stephen W. Marer, MD is listed in the NPI registry under infectious disease. Stephen graduated from University of California, Davis School of Medicine in 1994. Stephen is also listed as specializing in internal medicine. According to Medicare claims data, Stephen cared for 491 Medicare patients across 795 services. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, and hospital discharge day management, more than 30 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (323) 442-5100
- Email not available
Practice Locations
1520 SAN PABLO ST STE 1000
Los Angeles, CA 90033
3400 Lomita Blvd Ste 104
Torrance, CA 90505
Conditions Commonly Evaluated or Treated
Within Infectious Disease generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Bacterial infections
- C. diff Infection
- Cat Scratch Fever
- Drug-Resistant Bacterial Infection
- Flesh-Eating Infection
- NTM lung infection
- Recurrent bacterial vaginosis
- Tick-Borne Infection
- Tuberculosis
Bones & joints
Cardiovascular
Digestive infections
Fungal infections
- Aspergillosis mold infection
- Chronic Yeast Infection
- Cryptococcal fungal infection
- Fungal lung infection
- Fungal sinus infection
- Valley fever
General symptoms
Neurological infections
Parasitic infections
Post-infection conditions
Respiratory infections
Sexually transmitted infections
Skin & soft tissue
- Cellulitis
- Diabetic Foot Infection
- Dog or Animal Bite Infection
- Non-Healing Wound Infection
- Post-surgery fever or infection
- Skin and soft-tissue abscess
Travel-related infections
Urinary tract
Viral infections
- Chronic Epstein-Barr virus reactivation
- Cytomegalovirus
- Hepatitis B
- Mononucleosis
- Mpox
- Shingles
- West Nile virus
Procedures & services
Most searched procedures
Allergy & immunology
Allergy & Pharmacology
Antiviral treatments
Consultation & second opinions
- Diabetic Foot Ulcer Debridement Consultation
- Infection Screening Before Biologics
- Post-Travel Illness Workup
- Pre-Chemotherapy Infection Clearance
- Pre-Transplant Infection Screening
- Prosthetic Hardware Infection Evaluation
- Second Opinion on Antibiotic Treatment
Diagnostic evaluations
- Chronic viral fatigue evaluation
- Medical parasite clearance evaluation
- Post-sepsis syndrome evaluation
- Sinus infection culture evaluation
- Unexplained fever workup
Diagnostics & screening
- Blood Culture Workup
- Fungal Blood Testing
- Immune System Workup for Frequent Infections
- Joint injection or aspiration
- Spinal Tap Infection Analysis
- Stool Parasite Testing
- TB Skin Test
- Tuberculosis Blood Test
- Wound Culture and Sensitivity
Gastrointestinal treatments
Infusions & Medications
Lab testing & monitoring
- Comprehensive STI screening panel
- HIV viral load monitoring
- Infectious diarrhea stool pathogen PCR panel
- Mold and environmental fungal testing
- Specialized Lyme disease confirmation testing
- Tropical disease blood work
Medication management
- Atypical Mycobacteria Treatment Plan
- Chronic Hepatitis B Medication Management
- Infected Central Line Removal Coordination
- Malaria Treatment
- Oral Antibiotic Step-Down Therapy
- Recurrent Shingles Suppression
- Syphilis Injections
- Systemic Antifungal Therapy
Prevention & Prophylaxis
Prevention & prophylaxis
- Emergency HIV Prevention (PEP)
- Needlestick Injury Evaluation
- Rabies Post-Exposure Shots
- Tick Bite Evaluation
Travel medicine
Procedures Most Often Billed to Medicare
795 services · 491 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
355 | More often than most peers in Infectious Disease |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
208 | More often than most peers in Infectious Disease |
| Hospital discharge day management, more than 30 minutes | Office visit | 99239 |
133 | More often than most peers in Infectious Disease |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
79 | As often as other peers in Infectious Disease |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
20 | Less often than most peers in Infectious Disease |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other infectious disease specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other infectious disease specialists in Los Angeles 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at University of California, Davis School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1994 at University of California, Davis School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Dr. Marer?
Dr. Marer is an infectious disease specialist in Los Angeles, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Infectious Disease”.
NPI registry
What is Dr. Marer's address?
Dr. Marer is listed at 1520 San Pablo St Ste 1000, Los Angeles, CA 90033. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Marer?
The number on file is (323) 442-5100. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Marer's NPI number?
Dr. Marer's National Provider Identifier is 1043281322. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Marer train?
Dr. Marer attended University of California, Davis School of Medicine, graduating in 1994. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Marer been practicing?
Dr. Marer has 32 years experience. Calculated from a graduation year of 1994, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Marer perform?
According to Medicare billing data, Dr. Marer the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Marer confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marer. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.