Marissa Fox, MD
Internal Medicine Physician · Los Angeles, CA
Marissa Fox, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1356970883, issued on Apr 6, 2020. Check the license (California A178987, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marissa Fox
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A178987 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5901 W Olympic Blvd Ste 310, Los Angeles, CA 90036
- Phone
- (323) 215-1725
- Enumerated
- Apr 6, 2020
- Entity
- Type 1 · individual
Also registered at 5901 W Olympic Blvd Ste 310
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Caroline Belin, NP-CNurse Practitioner1447769971
- Matthew Diebler, AMFTMarriage & Family Therapist1104624139
- Wayne Ho, M.D.Internal Medicine Physician1477731867
- Kevin Rauchut, NP-CGerontology Nurse Practitioner1578084547
- Arthur Vermeulen, MDInternal Medicine Physician1598324055
Verify Marissa Fox in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A178987Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
5% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,635 Medicare Part D claims for 219 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims. 57 claims were for opioids.
Most prescribed
- Biktarvy162 claims
- Atorvastatin Calcium109 claims
- Gabapentin64 claims
- Losartan Potassium59 claims
- Omeprazole55 claims
- Metformin Hcl48 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $2,515.31
99 payments, mostly food and beverage; the largest payer was ViiV Healthcare Company. The 65,274 providers of this specialty with any payment received $2,536.66 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
1,665 internal medicine physician records list a Los Angeles practice address
They are 1,665 of the 69,537 NPPES records with a Los Angeles practice address, and 20,403 internal medicine physician records in California.
All 1,665 in Los Angeles → All 20,403 in California → Every provider in Los Angeles →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Marissa Fox, MD's NPI number?
Marissa Fox, MD's National Provider Identifier (NPI) is 1356970883, issued on Apr 6, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Fox, MD located?
The NPPES record lists a practice address at 5901 W Olympic Blvd Ste 310, Los Angeles, CA, 90036. Phone: (323) 215-1725. Providers update this record themselves, so call before visiting.
How can I verify Marissa Fox, MD's license?
NPPES lists California license number A178987, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marissa Fox, MD prescribe under Medicare Part D?
In 2024, Marissa Fox, MD had 2,635 Medicare Part D claims for 219 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.