Ryan William Matson, M.D.
Internal Medicine Physician · San Rafael, CA
Ryan William Matson, M.D. is an internal medicine physician with a practice address in San Rafael, California, and NPI 1366718264, issued on Mar 26, 2012. Check the license (California A126715, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ryan William Matson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A126715 CA
Self-reported in NPPES; status is on the state search - Practice location
- 99 Montecillo RD, San Rafael, CA 94903
- Phone
- (415) 444-2000
- Enumerated
- Mar 26, 2012
- Record last updated
- Dec 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150903002172); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 99 Montecillo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ryan William Matson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A126715Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average internal medicine physician in 2024
567 Medicare Part D claims for 206 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Atorvastatin Calcium42 claims
- Cefuroxime28 claims
- Doxycycline Monohydrate24 claims
- Gabapentin19 claims
- Furosemide18 claims
- Amoxicillin-Clavulanate Potass17 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
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ryan William Matson among 17,696 internal medicine physician records in California
Ryan William Matson, 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 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2012 · 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).
51 internal medicine physician records list a practice address in San Rafael
They are 51 of the 3,159 NPPES records with a practice address in San Rafael, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Rafael → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Patricia Bauman, M.D.San Rafael, CA 949031710077482
- Bryn Duffy, MDSan Rafael, CA 949031235243775
- Jill Dunton, MDSan Rafael, CA 949031588748552
- Joseph Habis, M.D.San Rafael, CA 949031760439681
- Jeffrey Harris, MDSan Rafael, CA 949031134203136
- Alpana Kharkar, MDSan Rafael, CA 949031982788055
- Steven Killpack, MDSan Rafael, CA 949031477651149
- Alan Kneitel, MDSan Rafael, CA 949031417031584
Common questions
What is Ryan William Matson, M.D.'s NPI number?
Ryan William Matson, M.D.'s National Provider Identifier (NPI) is 1366718264, issued on Mar 26, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Ryan William Matson, M.D. located?
The NPPES record lists a practice address at 99 Montecillo RD, San Rafael, CA, 94903. Phone: (415) 444-2000. Providers update this record themselves, so call before visiting.
How can I verify Ryan William Matson, M.D.'s license?
NPPES lists California license number A126715, 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 Ryan William Matson, M.D. prescribe under Medicare Part D?
In 2024, Ryan William Matson, M.D. had 567 Medicare Part D claims for 206 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.