NPPES file of Aug 9, 2026

Michael Muellner, M.D.

Internal Medicine Physician · Los Angeles, CA

Michael Muellner, M.D. is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1073959094, issued on May 16, 2013. Check the license (California A136445, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1073959094
Name
Michael Muellner
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
A136445 CA
Self-reported in NPPES; status is on the state search
Practice location
4733 W Sunset Blvd, Los Angeles, CA 90027
Phone
(323) 783-0339
Enumerated
May 16, 2013
Record last updated
Nov 3, 2021 (not updated in 5 years: call before relying on the address or phone)
Fax
(866) 455-3867
Medicare enrollment
Enrolled (PECOS I20170411002159); accepts Medicare assignment
Medical or professional school
Loma Linda University School Of Medicine, 2013
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →

Also registered at 4733 W Sunset Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Antoine Abcar, MDNephrology Physician1245301159
  2. Iman Abdalla, MDHematology & Oncology Physician1730248311
  3. Joseph Abu-Dalu, MDVascular Surgery Physician1821157587
  4. Isaac Abusleme, M.D.Internal Medicine Physician1891109468
  5. Nancy Adachi, PTPhysical Therapist1902004245
  6. Sangeeta Aggarwal, MDInternal Medicine Physician1578655908

Verify Michael Muellner in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A136445    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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88% fewer Medicare Part D claims than the average internal medicine physician in 2024

387 Medicare Part D claims for 112 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.

  1. Michael Muellner387
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium46 claims
  2. Clopidogrel37 claims
  3. Carvedilol17 claims
  4. Metoprolol Tartrate16 claims
  5. Losartan Potassium13 claims
  6. Pantoprazole Sodium12 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 one group practice

  1. Southern California Permanente Medical GroupLos Angeles, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Michael Muellner among 17,696 internal medicine physician records in California

Michael Muellner, 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 2013, is newer than 71% of them.

  • NPI issued2013 · 71% of these records are older, 26% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 63% of these records are
  • Graduated2013 · median 2004 among the 11,065 with a school on file
  • Record last updated2021 · 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

  1. Sangeeta Aggarwal, MDLos Angeles, CA 900271578655908
  2. Hagop Bezikian, MDLos Angeles, CA 900271821171604
  3. Roshanak Eftekhari, M.D.Los Angeles, CA 900271619936556
  4. Martin Hirsch, MDLos Angeles, CA 900271881765774
  5. Missak Kltchian, MDLos Angeles, CA 900271255359840
  6. Ani Markarian, M.D.Los Angeles, CA 900271457305435
  7. Lyn Pestana, MDLos Angeles, CA 900271013088996
  8. Edward Quiming, MDLos Angeles, CA 900271497826465

Common questions

What is Michael Muellner, M.D.'s NPI number?

Michael Muellner, M.D.'s National Provider Identifier (NPI) is 1073959094, issued on May 16, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Michael Muellner, M.D. located?

The NPPES record lists a practice address at 4733 W Sunset Blvd, Los Angeles, CA, 90027. Phone: (323) 783-0339. Providers update this record themselves, so call before visiting.

How can I verify Michael Muellner, M.D.'s license?

NPPES lists California license number A136445, 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 Michael Muellner, M.D. prescribe under Medicare Part D?

In 2024, Michael Muellner, M.D. had 387 Medicare Part D claims for 112 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.