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DR. JAMES W. HORNSTEIN M.D.
NPI 1629116587
Family Medicine in Ventura, CA

Active since February 02, 2007PECOS EnrolledAccepts Medicare AssignmentCLIA 05D0953325 · Microscopy
75/100
CMS Quality Rating
2793 LOMA VISTA RD, VENTURA, CA 93003(805) 643-9292(805) 643-3626 Get Directions Write a Review

NPPES record last updated: March 23, 2015. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. James W. Hornstein M.d. NPPES

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

DR. JAMES W. HORNSTEIN M.D. (NPI 1629116587) is an individual family medicine provider in Ventura, California, licensed in California (770183168) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, holds a CLIA Microscopy certificate valid through October 29, 2026, and is a graduate of University Of California, Geffen School Of Medicine (1980).

NPPES Registry Identity

NPI1629116587
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. JAMES W. HORNSTEINCredential: M.D.
Location Address2793 LOMA VISTA RDVentura, CA 93003-1544
Mailing Address2793 Loma Vista RdVentura, CA 93003-1544 · (805) 643-9292 · Fax (805) 643-3626
Phone(805) 643-9292
Fax(805) 643-3626
Sole ProprietorYes
Medical School CMSUniversity Of California, Geffen School Of MedicineGraduated 1980
Enumeration DateFebruary 2, 2007
Last NPPES UpdateMarch 23, 2015
✔ NPI 1629116587 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · 770183168
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
2793 LOMA VISTA RD, Ventura, CA 93003
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Other Identifiers 2

Medicare UPINA50106CA
Medicare PING45593

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. James W. Hornstein 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 ID6800931999
PECOS Enrollment IDI20100301000227
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.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate for Provider-Performed Microscopy Procedures (PPMP) 05D0953325

James W Hornstein MD · Ventura, CA
Active · expires Oct 29, 2026
CLIA Number05D0953325
Laboratory TypePhysician Office
Certificate Effective DateOctober 30, 2024
Certificate Expiration DateOctober 29, 2026
Laboratory DirectorJames W. Hornstein MD
Laboratory Phone(805) 643-9292
Laboratory LocationJames W Hornstein MD2793 Loma Vista Rd, Ventura, CA 93003
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory in which a physician, midlevel practitioner or dentist performs no tests other than the microscopy procedures. This certificate permits the laboratory to also perform waived tests.

Areas of Expertise CMS Part B claims 16

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
566 services213 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
558 services223 patients
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month 99490
Chronic care management services involve a healthcare professional directing clinical staff in managing your chronic conditions. This includes the first 20 minutes per month of services like medication management, care coordination, and health monitoring to help improve your health and quality of life.
420 services82 patients
Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month 99439
Chronic Care Management services involve regular check-ins with healthcare professionals to manage two or more chronic conditions. It includes an additional 20 minutes of clinical staff time per month, directed by a healthcare professional, to ensure optimal health management.
211 services72 patients
Telephone medical discussion with physician, 11-20 minutes 99442
This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.
149 services92 patients
Advance care planning, first 30 minutes 99497
Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.
100 services100 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93003 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
$95.28 typical visit price
range $62.32 – $185.36
Typical copayment $23.82 (range $15.58 – $46.34)
Most-billed visit code 99203
Established Patient
$108.74 typical visit price
range $20.68 – $151.85
Typical copayment $27.18 (range $5.17 – $37.96)
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.

75/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice

Referred Medical Equipment & Supplies CMS DME claims 4

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

Tubing with integrated heating element for use with positive airway pressure device A4604
DME-Other DME · category DE001N
3 suppliers11 claims11 services$33.98 avg. paid by Medicare
Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap A7034
DME-Other DME · category DE001N
4 suppliers13 claims13 services$41.89 avg. paid by Medicare
Filter, disposable, used with positive airway pressure device A7038
DME-Other DME · category DE001N
5 suppliers17 claims98 services$1.72 avg. paid by Medicare
Continuous positive airway pressure (cpap) device E0601
DME-Other DME · category DE001N
3 suppliers30 claims30 services$24.74 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 James Hornstein's NPI number?

The NPI number for James Hornstein is 1629116587. It was assigned to this individual provider in the NPPES registry on February 2, 2007.

Where is James Hornstein located?

James Hornstein practices at 2793 Loma Vista Rd, Ventura, CA 93003. The listed phone number is (805) 643-9292.

What is James Hornstein's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is James Hornstein enrolled in Medicare?

Yes. James Hornstein 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.

Does James Hornstein hold a CLIA laboratory certificate?

Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 05D0953325) is associated with this NPI, valid through October 29, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for James Hornstein was last updated on March 23, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years 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.