HARRIS AVERY MASKET M.D.
NPI 1801921218
Internal Medicine - Sports Medicine in Mill Valley, CA

Q: What is Harris Masket's NPI number?

The NPI number for Harris Masket is 1801921218. It was assigned to this individual provider in the NPPES registry on February 23, 2007.

Q: What is Harris Masket's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Sports Medicine, with taxonomy code 207RS0010X.

Q: Is Harris Masket enrolled in Medicare?

No. Harris Masket has opted out of Medicare through April 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Harris Masket was last updated on October 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since February 23, 2007Opted out of Medicare · through Apr 1, 2027

100 SHORELINE HIGHWAY, 210A, MILL VALLEY, CA 94941(415) 388-5520(415) 388-5503 Get Directions Write a Review

NPPES record last updated: October 21, 2024. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Harris Avery Masket M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

HARRIS AVERY MASKET M.D. (NPI 1801921218) is an individual sports medicine provider in Mill Valley, California, licensed in California (A74623) and active in the NPI registry since February 2007. He has opted out of Medicare through April 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1801921218

Entity TypeIndividualMale

Primary Taxonomy207RS0010X

Provider Legal NameHARRIS AVERY MASKETCredential: M.D.

Location Address100 SHORELINE HIGHWAY, 210AMill Valley, CA 94941

Mailing Address5442 Boyd AveOakland, CA 94618-1115 · (510) 368-2802

Phone(415) 388-5520

Fax(415) 388-5503

Sole ProprietorNo

Enumeration DateFebruary 23, 2007

Last NPPES UpdateOctober 21, 2024

NPPES CertifiedDecember 19, 2023

✔ NPI 1801921218 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Sports MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207RS0010X

License✔ Licensed in CA · A74623

Definition

An internist trained to be responsible for continuous care in the field of sports medicine, not only for the enhancement of health and fitness, but also for the prevention of injury and illness. A sports medicine physician must have knowledge and experience in the promotion of wellness and the prevention of injury. Knowledge about special areas of medicine such as exercise physiology, biomechanics, nutrition, psychology, physical rehabilitation, epidemiology, physical evaluation, injuries (treatment and prevention and referral practice) and the role of exercise in promoting a healthy lifestyle are essential to the practice of sports medicine. The sports medicine physician requires special education to provide the knowledge to improve the healthcare of the individual.

100 SHORELINE HIGHWAY, Mill Valley, CA 94941

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Harris Avery Masket M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from April 1, 2023 through April 1, 2027.

Opt-Out Effective DateApril 1, 2023

Opt-Out In Effect ThroughApril 1, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHEN MEDICAL INC

Psychiatry & Neurology (Geriatric Psychiatry)

100 SHORELINE HIGHWAY, BUILDING B SUITE 100-1020
MILL VALLEY, CA 94941

Marin County (213) 534-7330

SARAH CLARK PHD

Clinical Neuropsychologist

100 SHORELINE HIGHWAY, BUILDING B, SUITE 100
MILL VALLEY, CA 94941

Marin County (415) 877-4408

DR. BETH C MCDOUGALL M.D.

General Practice

100 SHORELINE HIGHWAY, 210A
MILL VALLEY, CA 94941

Marin County (415) 388-5520

BROOKE E BENNIS D.O.

Physical Medicine & Rehabilitation

100 SHORELINE HIGHWAY, 210A
MILL VALLEY, CA 94941

Marin County (415) 388-5520

DR. MARIA ELENA MARIAN ND

Naturopath

100 SHORELINE HIGHWAY, 210A
MILL VALLEY, CA 94941

Marin County (415) 388-5520

DR. THOMAS LOUIS LOWE M.D.

Psychiatry & Neurology (Psychiatry)

100 SHORELINE HIGHWAY, SUITE 100-B
MILL VALLEY, CA 94941

Marin County (415) 275-4933

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Harris Masket's NPI number?

The NPI number for Harris Masket is 1801921218. It was assigned to this individual provider in the NPPES registry on February 23, 2007.

Where is Harris Masket located?

Harris Masket practices at 100 Shoreline Highway 210A, Mill Valley, CA 94941. The listed phone number is (415) 388-5520.

What is Harris Masket's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Sports Medicine, with taxonomy code 207RS0010X.

Is Harris Masket enrolled in Medicare?

No. Harris Masket has opted out of Medicare through April 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Harris Masket was last updated on October 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.