Harris Avery Masket, M.D.
Sports Medicine (Internal Medicine) Physician · Mill Valley, CA
Harris Avery Masket, M.D. is a sports medicine (internal medicine) physician with a practice address in Mill Valley, California, and NPI 1801921218, issued on Feb 23, 2007. Check the license (California A74623, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Harris Avery Masket
- Credential
- M.D.
- Primary taxonomy
- Sports Medicine (Internal Medicine) Physician 207RS0010X
- License number
- A74623 CA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Shoreline Highway, Mill Valley, CA 94941
- Phone
- (415) 388-5520
- Enumerated
- Feb 23, 2007
- Record last updated
- Oct 21, 2024
- Fax
- (415) 388-5503
- Entity
- Type 1 · individual
8 nearest sports medicine (internal medicine) physician records → All 48 in California → Look up another NPI →
Also registered at 100 Shoreline Highway
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Harris Avery Masket in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A74623Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average sports medicine (internal medicine) physician in 2024
16 Medicare Part D claims, against an average of 605 among the 227 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $42.87
1 payment: food and beverage; the largest payer was Cleerly, Inc. The 125 providers of this specialty with any payment received $667.42 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Harris Avery Masket among 48 sports medicine (internal medicine) physician records in California
Harris Avery Masket, M.D. is one of 48 sports medicine (internal medicine) physician records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 35% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2024 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RS0010X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sports Medicine (Internal Medicine) Physician providers in California
There are 48 sports medicine (internal medicine) physician records in California.
All 48 in California → Every provider in Mill Valley → Sports Medicine (Internal Medicine) Physician nationwide →
The 8 sports medicine (internal medicine) physician records with the nearest ZIP codes
- William Cappiello, MDSanta Clara, CA 950511184701013
- Michael Milburn, MDSanta Clara, CA 950511740367697
- Daniel Ouyang, M.D.Santa Clara, CA 950511669671681
- Richard Reitman, MDSanta Clara, CA 950511912084856
- Chad Roghair, MDBerkeley, CA 947051679509053
- Meredith Bean, MDOakland, CA 946111225116726
- Martin Gon, MDOakland, CA 946111831278985
- Janice Murota, MDOakland, CA 946111720166515
Common questions
What is Harris Avery Masket, M.D.'s NPI number?
Harris Avery Masket, M.D.'s National Provider Identifier (NPI) is 1801921218, issued on Feb 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Harris Avery Masket, M.D. located?
The NPPES record lists a practice address at 100 Shoreline Highway, Mill Valley, CA, 94941. Phone: (415) 388-5520. Providers update this record themselves, so call before visiting.
How can I verify Harris Avery Masket, M.D.'s license?
NPPES lists California license number A74623, 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 Harris Avery Masket, M.D. prescribe under Medicare Part D?
In 2024, Harris Avery Masket, M.D. had 16 Medicare Part D claims; the average among sports medicine (internal medicine) physician prescribers was 605. 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.