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

DR. JUSTIN EDWARD GRENET MD
NPI 1770102915
Internal Medicine - Hematology & Oncology in Santa Rosa, CA

Q: What is Justin Grenet's NPI number?

The NPI number for Justin Grenet is 1770102915. It was assigned to this individual provider in the NPPES registry on April 8, 2020.

Q: What is Justin Grenet'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 Justin Grenet was last updated on June 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 51 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 08, 2020PECOS Enrolled

3555 ROUND BARN CIR, SANTA ROSA, CA 95403(707) 528-1050(707) 525-3874 Get Directions Write a Review

NPPES record last updated: June 30, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jun 1, 2026, Apr 8, 2020 (2 updates tracked since 2020).

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About Dr. Justin Edward Grenet Md NPPES

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

DR. JUSTIN EDWARD GRENET MD (NPI 1770102915) is an individual hematology & oncology provider in Santa Rosa, California, licensed in California (A209369) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1770102915

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameDR. JUSTIN EDWARD GRENETCredential: MD

Location Address3555 ROUND BARN CIRSanta Rosa, CA 95403-1757

Mailing Address3555 Round Barn CirSanta Rosa, CA 95403-1757 · (707) 528-1050 · Fax (707) 525-3874

Phone(707) 528-1050

Fax(707) 525-3874

Sole ProprietorNo

Enumeration DateApril 8, 2020

Last NPPES UpdateJune 30, 20262 updates tracked since enumeration

NPPES CertifiedJune 30, 2026

✔ NPI 1770102915 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 · A209369

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.

3555 ROUND BARN CIR, Santa Rosa, CA 95403

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Justin Edward Grenet Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95403 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

$187.01 typical visit price

range $63.04 – $187.01

Typical copayment $46.75 (range $15.76 – $46.75)

Most-billed visit code 99205

Established Patient

$109.88 typical visit price

range $21.02 – $153.40

Typical copayment $27.47 (range $5.25 – $38.35)

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.

Other Providers at the Same Location NPPES 17

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

JARROD PAUL HOLMES MD

Internal Medicine (Hematology & Oncology)