NPPES file of Aug 9, 2026

Ridgely Oliver Muller, M.D.

Emergency Medicine Physician · Santa Rosa, CA

Ridgely Oliver Muller, M.D. is an emergency medicine physician with a practice address in Santa Rosa, California, and NPI 1003920497, issued on Aug 19, 2006. Check the license (California A64483, 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
1003920497
Name
Ridgely Oliver Muller
Credential
M.D.
Primary taxonomy
Emergency Medicine Physician 207P00000X
License number
A64483 CA
Self-reported in NPPES; status is on the state search
Practice location
1165 Montgomery Dr, Santa Rosa, CA 95405
Phone
(707) 525-5207
Enumerated
Aug 19, 2006
Record last updated
Nov 9, 2021 (not updated in 5 years: call before relying on the address or phone)
Fax
(626) 397-5643
Medicaid ID
00A644830 CA
Medicare enrollment
Enrolled (PECOS I20070601000221); accepts Medicare assignment
Medical or professional school
University Of Southern California Keck School Of Medicine, 1996
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.
Download card Updates feed

8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →

Also registered at 1165 Montgomery Dr

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

  1. Maryam Aghighi, MDAnatomic Pathology & Clinical Pathology Physician1073074977
  2. Johnathan Agil, MDEmergency Medicine Physician1700413002
  3. Katherine Aldrich, NPAdult Health Nurse Practitioner1194995563
  4. Mujeeb Altaf, MBBS.,MRCP(UK)Hospitalist Physician1316125941
  5. Rebecca Althoff, RNFARegistered Nurse First Assistant1427119668
  6. Sanyogeeta Bhaway, M.D.Internal Medicine Physician1275828162

Verify Ridgely Oliver Muller in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A64483    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

2.9 times the Medicare Part D claims of the average emergency medicine physician in 2024

651 Medicare Part D claims for 287 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 131 claims were for opioids.

  1. Ridgely Muller651
  2. Specialty average226

Most prescribed

  1. Methylprednisolone94 claims
  2. Ondansetron Odt88 claims
  3. Oxycodone-Acetaminophen77 claims
  4. Cephalexin41 claims
  5. Hydrocodone-Acetaminophen36 claims
  6. Fluticasone Propionate17 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. Providence Medical FoundationSanta Rosa, CA

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

Ridgely Oliver Muller among 7,751 emergency medicine physician records in California

Ridgely Oliver Muller, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.

  • NPI issued2006 · 4% of these records are older, 60% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 59% of these records are
  • Graduated1996 · median 2011 among the 4,560 with a school on file
  • Record last updated2021 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Emergency Medicine Physician providers in California

There are 7,751 emergency medicine physician records in California.

All 7,751 in California → Every provider in Santa Rosa → Emergency Medicine Physician nationwide →

The 8 emergency medicine physician records with the nearest ZIP codes

  1. Thomas Elgin, M.D.Santa Rosa, CA 954051912948480
  2. Omar Ferrari, D.O.Santa Rosa, CA 954051861589186
  3. David Giannetto, MDSanta Rosa, CA 954051881717155
  4. David Grundy, MDSanta Rosa, CA 954051902845597
  5. Stewart Lauterbach, M.D.Santa Rosa, CA 954051992746481
  6. Stephen Levinson, M.D.Santa Rosa, CA 954051144261637
  7. Daniel Matulich, M.D.Santa Rosa, CA 954051043254600
  8. Gary Mc Calla, M.D.Santa Rosa, CA 954051669416285

Common questions

What is Ridgely Oliver Muller, M.D.'s NPI number?

Ridgely Oliver Muller, M.D.'s National Provider Identifier (NPI) is 1003920497, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Ridgely Oliver Muller, M.D. located?

The NPPES record lists a practice address at 1165 Montgomery Dr, Santa Rosa, CA, 95405. Phone: (707) 525-5207. Providers update this record themselves, so call before visiting.

How can I verify Ridgely Oliver Muller, M.D.'s license?

NPPES lists California license number A64483, 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 Ridgely Oliver Muller, M.D. prescribe under Medicare Part D?

In 2024, Ridgely Oliver Muller, M.D. had 651 Medicare Part D claims for 287 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.