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JULIA OLSON FARMER MD
NPI 1508959347
Internal Medicine in Vista, CA

Active since October 02, 2006PECOS Enrolled
105 DURIAN ST STE B, VISTA, CA 92083(760) 631-5000(760) 414-3892 Get Directions Write a Review

NPPES record last updated: February 26, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Feb 26, 2025, Aug 25, 2022, Jan 22, 2021 (3 updates tracked since 2021).

About Julia Olson Farmer Md NPPES

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

JULIA OLSON FARMER MD (NPI 1508959347) is an individual internal medicine provider in Vista, California, licensed in California (C171929) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS, maintains a secondary practice location in Vista, and is a graduate of University Of California, Davis School Of Medicine (2002).

NPPES Registry Identity

NPI1508959347
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameJULIA OLSON FARMERCredential: MD
Location Address105 DURIAN ST STE BVista, CA 92083-6230
Mailing Address1000 Vale Terrace DrVista, CA 92084-5218 · (760) 631-5000 · Fax (760) 414-3892
Phone(760) 631-5000
Fax(760) 414-3892
Sole ProprietorNo
Medical School CMSUniversity Of California, Davis School Of MedicineGraduated 2002
Enumeration DateOctober 2, 2006
Last NPPES UpdateFebruary 26, 20253 updates tracked since enumeration
NPPES CertifiedFebruary 26, 2025
✔ NPI 1508959347 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CA · C171929✔ Licensed in CO · 43102
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedInternal Medicine · RheumatologyTaxonomy 207RR0500X · License C171929 (CA)
105 DURIAN ST STE B, Vista, CA 92083
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Other Names 1

Former Name (1)Julia Joelle Rhiannon

Secondary Practice Location 1

Location 11000 Vale Terrace DrVista, CA 92084-5218 · Phone (760) 631-5000 · Fax (760) 414-3892

Other Identifiers 1

Medicaid1508959347CO

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Julia Olson Farmer Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID4587739644
PECOS Enrollment IDI20250917002139
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 92083 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
$140.22 typical visit price
range $62.10 – $184.71
Typical copayment $35.05 (range $15.52 – $46.17)
Most-billed visit code 99204
Established Patient
$108.42 typical visit price
range $20.62 – $151.42
Typical copayment $27.10 (range $5.15 – $37.85)
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.

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
7 suppliers14 claims31 services$5.10 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

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

MAX CHEN M.D.
Internal Medicine
105 DURIAN ST STE B
VISTA, CA 92083
San Diego County (760) 631-5000

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 Julia Farmer's NPI number?

The NPI number for Julia Farmer is 1508959347. It was assigned to this individual provider in the NPPES registry on October 2, 2006. The provider is also known as Julia Joelle Rhiannon.

Where is Julia Farmer located?

Julia Farmer practices at 105 Durian St Ste B, Vista, CA 92083. The listed phone number is (760) 631-5000.

What is Julia Farmer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Julia Farmer enrolled in Medicare?

Yes. Julia Farmer is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Julia Farmer was last updated on February 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.