Dr. Michael E. Mason, MD
- Part D claims, 2024
- 6,898
- Hospital affiliations
- 1
- Industry payments
- $169
- Medical group
- 1
- Insurance carriers
- 2
- Practice address
- 99 Montecillo Rd, San Rafael, CA 94903
- Practice phone
- Call (415) 444-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mason's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael E. Mason is an internist in San Rafael, California
Dr. Mason practices at San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente.
Dr. Mason's NPI, 1215011200, was assigned on October 25, 2006. Dr. Mason graduated from David Geffen School of Medicine at UCLA in 1995. Dr. Mason holds California license A62372.
- NPI
- 1215011200NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385839778
- NPI enumeration date
- October 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (415) 444-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael E. Mason practices at San Rafael Medical Center in San Rafael, California
Dr. Mason's primary practice is San Rafael Medical Center, at 99 Montecillo Rd, San Rafael, CA 94903 in Marin County. The practice phone is (415) 444-2000.
- San Rafael Medical Center99 Montecillo Rd, San Rafael, CA 94903 · Marin CountyPhone(415) 444-2000
Source: Dmand AI Affiliation Data
Dr. Michael E. Mason is affiliated with 1 site of care and 1 medical group
Dr. Mason's primary practice is San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael E. Mason's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mason practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Rafael Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael E. Mason is one of 16,751 internists in California
Internal medicine is Dr. Mason's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Mason is board certified in family medicine by the American Board of Family Medicine. Dr. Mason is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists arthritis among the conditions Dr. Mason treats.
Internists near Dr. Mason
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael E. Mason's patients have a median age of 70
Across all payers, Dmand AI patient panel data puts Dr. Mason's median patient age at 70, with 49% women.
Dr. Mason's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women49%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Michael E. Mason wrote 6,898 Medicare Part D claims in 2024
In 2024, Dr. Mason wrote 6,898 Medicare Part D claims for 787 patients. 92% of them were for generic drugs. CMS names the drug for 6,275 of them, across 109 drugs with 11 or more claims each, at $182,864 in total drug cost. In 2023, CMS named 6,208 claims across 103 drugs.
Dr. Mason's Part D claims by kind of drug, 2024
- Generic6,326 claims92%
- Brand-name526 claims8%
- Other46 claims1%
Dr. Mason's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mason's Part D claims, 2024
- Opioids4%252 of 6,898 claims
- Antibiotics3%224 of 6,898 claims
- Antipsychotics, patients 65 and over1%35 of 6,898 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,2082024: 6,2751%
Drugs named by CMS: 109 in 2024, 103 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Michael E. Mason offers telehealth to Medicare patients
Dr. Mason accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Mason as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Michael E. Mason received $169 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Mason from 1 drug or device company in 2018. Travel and lodging make up the largest share, 100% of the total. Stryker Corporation paid the most, $169.
Companies that paid Dr. Mason the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael E. Mason has 1 award and honors on record
Dmand AI lists 1 award for Dr. Mason, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Mason
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. Michael E. Mason graduated from David Geffen School of Medicine at UCLA
Dr. Mason graduated from David Geffen School of Medicine at UCLA in 1995.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Dr. Michael E. Mason accepts plans from 2 insurance carriers
Dr. Mason is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Mason accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael E. Mason's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael E. Mason
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael E. Mason's NPI number?
Dr. Michael E. Mason's NPI number is 1215011200. It was assigned on October 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael E. Mason?
Dr. Michael E. Mason is an internist in San Rafael, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Michael E. Mason practice?
Dr. Mason practices at 99 Montecillo Rd, San Rafael, CA 94903. Dr. Mason's primary practice is San Rafael Medical Center in San Rafael, California, part of Kaiser Permanente.
What is Dr. Michael E. Mason's office phone number?
The practice phone on file for Dr. Mason is (415) 444-2000.
What is Dr. Michael E. Mason's medical license number?
Dr. Mason holds California license A62372.
Which hospitals is Dr. Michael E. Mason affiliated with?
Dr. Mason practices at San Rafael Medical Center in San Rafael, California.
What medical group is Dr. Michael E. Mason part of?
Dr. Mason is linked to The Permanente Medical Group, Inc.
Does Dr. Michael E. Mason accept Medicare?
Yes. CMS lists Dr. Mason as accepting Medicare assignment.
Does Dr. Michael E. Mason offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Mason as offering telehealth services.
Is Dr. Michael E. Mason board certified?
Yes. Dr. Mason is board certified in family medicine by the American Board of Family Medicine.
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Where did Dr. Michael E. Mason go to medical school?
Dr. Mason graduated from David Geffen School of Medicine at UCLA in 1995.
What drugs does Dr. Michael E. Mason prescribe most?
In 2024 Medicare Part D data, Dr. Mason's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Amlodipine Besylate.
Has Dr. Michael E. Mason received payments from drug or device companies?
CMS Open Payments shows $169 in general payments to Dr. Mason from 1 company from 2018 to 2018. The largest total came from Stryker Corporation.
How long has Dr. Michael E. Mason been practicing?
Dr. Mason graduated from medical school in 1995, 31 years ago.
What insurance does Dr. Michael E. Mason accept?
Dr. Mason is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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