Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

CYRUS MAZIDI M.D.
NPI 1326570771
Internal Medicine - Hematology & Oncology in Greenbrae, CA

Q: What is Cyrus Mazidi's NPI number?

The NPI number for Cyrus Mazidi is 1326570771. It was assigned to this individual provider in the NPPES registry on April 3, 2017.

Q: What is Cyrus Mazidi's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for Cyrus Mazidi was last updated on October 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days 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 April 03, 2017PECOS EnrolledAccepts Medicare Assignment

76.7/100

CMS Quality Rating

1350 S ELISEO DR STE 200, GREENBRAE, CA 94904(415) 925-5000(415) 925-5050 Get Directions Write a Review

NPPES record last updated: October 15, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 15, 2026, Aug 10, 2023 (2 updates tracked since 2023).

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About Cyrus Mazidi M.d. NPPES

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

CYRUS MAZIDI M.D. (NPI 1326570771) is an individual hematology & oncology provider in Greenbrae, California, licensed in California (A196180) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS and is a graduate of Tulane University School Of Medicine (2017).

NPPES Registry Identity

NPI1326570771

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameCYRUS MAZIDICredential: M.D.

Location Address1350 S ELISEO DR STE 200Greenbrae, CA 94904-2018

Mailing Address1350 S Eliseo Dr Ste 200Greenbrae, CA 94904-2018 · (415) 925-5000 · Fax (415) 925-5050

Phone(415) 925-5000

Fax(415) 925-5050

Sole ProprietorNo

Medical School CMSTulane University School Of MedicineGraduated 2017

Enumeration DateApril 3, 2017

Last NPPES UpdateOctober 15, 20262 updates tracked since enumeration

NPPES CertifiedOctober 15, 2026

✔ NPI 1326570771 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in CA · A196180

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

1350 S ELISEO DR STE 200, Greenbrae, CA 94904

Open in Google Maps ↗

Other Identifiers 1

Medicaid104185603-0005PA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Cyrus Mazidi M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3476820994

PECOS Enrollment IDI20260407000868

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Cyrus Mazidi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Marin Cancer Care Inc

Same address

Hematology & Oncology

1350 S ELISEO DR, SUITE 200
Greenbrae, CA 94904

Reassigned Medicare billing, California enrollment
15 clinicians in this Medicare group

NPI 1629370499 (415) 925-5000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94904 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$202.63 typical visit price

range $69.07 – $202.63

Typical copayment $50.65 (range $17.26 – $50.65)

Most-billed visit code 99205

Established Patient

$119.61 typical visit price

range $23.44 – $166.64

Typical copayment $29.90 (range $5.86 – $41.66)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

76.7/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

55.19

Promoting Interoperability

Improvement Activities

Cost

54.93

Other Providers at the Same Location NPPES 2

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

JUSTIN BIDDLE NP

Nurse Practitioner

1350 S ELISEO DR STE 200
GREENBRAE, CA 94904

Marin County (415) 925-5000

MS. KRISTIN NICOLE ANDERSON MD, MPH

Internal Medicine (Hematology & Oncology)

1350 S ELISEO DR STE 200
GREENBRAE, CA 94904

Marin County (415) 925-5000

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 Cyrus Mazidi's NPI number?

The NPI number for Cyrus Mazidi is 1326570771. It was assigned to this individual provider in the NPPES registry on April 3, 2017.

Where is Cyrus Mazidi located?

Cyrus Mazidi practices at 1350 S Eliseo Dr Ste 200, Greenbrae, CA 94904. The listed phone number is (415) 925-5000.

What is Cyrus Mazidi's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Cyrus Mazidi enrolled in Medicare?

Yes. Cyrus Mazidi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Cyrus Mazidi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Cyrus Mazidi reassigns Medicare benefits to Marin Cancer Care Inc (Greenbrae, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Cyrus Mazidi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Cyrus Mazidi was last updated on October 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days 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.