John N. Mafi, M.D.
Internal Medicine Physician · Los Angeles, CA
John N. Mafi, M.D. is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1063649465, issued on Jun 12, 2009. Check the license (California A137497, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John N. Mafi
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A137497 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Medical Plz, Los Angeles, CA 90095
- Phone
- (310) 794-2280
- Enumerated
- Jun 12, 2009
- Record last updated
- Oct 27, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150903001416); accepts Medicare assignment
- Medical or professional school
- Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 200 Medical Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John N. Mafi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A137497Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average internal medicine physician in 2024
684 Medicare Part D claims for 70 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium56 claims
- Losartan Potassium27 claims
- Rosuvastatin Calcium27 claims
- Amlodipine Besylate25 claims
- Clopidogrel18 claims
- Albuterol Sulfate Hfa17 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.
Bills Medicare through 2 group practices
- The Regents OF The University OF CaliforniaLos Angeles, CA
- Venice Family ClinicSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John N. Mafi among 17,696 internal medicine physician records in California
John N. Mafi, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2004 among the 11,065 with a school on file
- Record last updated2015 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Benjamin Ansell, MDLos Angeles, CA 900951770516882
- Arnold Brickman, MDLos Angeles, CA 900951447284906
- Arleen Brown, MDLos Angeles, CA 900951720013618
- Richard Buyalos, MDLos Angeles, CA 900951720012123
- Basit Chaudhry, MDLos Angeles, CA 900951992739460
Common questions
What is John N. Mafi, M.D.'s NPI number?
John N. Mafi, M.D.'s National Provider Identifier (NPI) is 1063649465, issued on Jun 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is John N. Mafi, M.D. located?
The NPPES record lists a practice address at 200 Medical Plz, Los Angeles, CA, 90095. Phone: (310) 794-2280. Providers update this record themselves, so call before visiting.
How can I verify John N. Mafi, M.D.'s license?
NPPES lists California license number A137497, 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 John N. Mafi, M.D. prescribe under Medicare Part D?
In 2024, John N. Mafi, M.D. had 684 Medicare Part D claims for 70 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.