Marissa Fox, MD
NPI 1356970883 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Fox, MD is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1356970883).
Provider details
- NPI number
- 1356970883
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A178987 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
6 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 74 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 162 | 26 |
| Atorvastatin Calcium | 109 | 30 |
| Gabapentin | 64 | 19 |
| Losartan Potassium | 59 | 12 |
| Omeprazole | 55 | 18 |
| Metformin Hcl | 48 | 19 |
| Rosuvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,515 across 99 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-06
- Last updated
- 2024-02-25
- Certified
- 2024-02-25
Frequently asked questions
- What is Marissa Fox's NPI number?
- Marissa Fox's National Provider Identifier (NPI) is 1356970883, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Fox's specialty?
- Marissa Fox is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marissa Fox located?
- Marissa Fox's practice location on file with NPPES is 5901 W Olympic Blvd Ste 310, Los Angeles, CA 90036-4664.
- What is Marissa Fox's phone number?
- The practice phone number listed in the NPPES registry for Marissa Fox is (323) 215-1725.
- Does Marissa Fox accept Medicare?
- Marissa Fox is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Fox's NPI active?
- Yes — Marissa Fox's NPI (1356970883) is active in the NPPES registry as of the last update on 2024-02-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.