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DR. FRED JOHN VONSTIEFF M.D.
NPI 1790849685
Family Medicine - Addiction Medicine in Concord, CA

Active since December 21, 2006PECOS EnrolledAccepts Medicare Assignment
2481 PACHECO ST, CONCORD, CA 94520(925) 680-8933(925) 680-7635 Get Directions Write a Review

NPPES record last updated: July 30, 2014. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Fred John Vonstieff M.d. NPPES

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

DR. FRED JOHN VONSTIEFF M.D. (NPI 1790849685) is an individual addiction medicine provider in Concord, California, licensed in California (G34928) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS and is a graduate of Un Of California, Irvine, College Of Medicine (1976).

NPPES Registry Identity

NPI1790849685
Entity TypeIndividualMale
Primary Taxonomy207QA0401X
Provider Legal NameDR. FRED JOHN VONSTIEFFCredential: M.D.
Location Address2481 PACHECO STConcord, CA 94520-2019
Mailing Address2481 Pacheco StConcord, CA 94520-2019 · (925) 680-8933
Phone(925) 680-8933
Fax(925) 680-7635
Sole ProprietorYes
Medical School CMSUn Of California, Irvine, College Of MedicineGraduated 1976
Enumeration DateDecember 21, 2006
Last NPPES UpdateJuly 30, 2014
✔ NPI 1790849685 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily Medicine · Addiction MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QA0401X
License✔ Licensed in CA · G34928
Definition
A family medicine physician who specializes in the diagnosis and treatment of addictions.
2481 PACHECO ST, Concord, CA 94520
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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 and accepts Medicare assignment

Dr. Fred John Vonstieff 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 ID4183808793
PECOS Enrollment IDI20110406000234
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.

Areas of Expertise CMS Part B claims 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
189 services51 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
69 services25 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
62 services50 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
57 services48 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94520 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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 3

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

VIVIAN LO PA-C
Physician Assistant
2481 PACHECO ST
CONCORD, CA 94520
Contra Costa County (925) 680-8933
FRED J VON STIEFF MD A PROFESSIONAL CORPORATION
Family Medicine (Addiction Medicine)
2481 PACHECO ST
CONCORD, CA 94520
Contra Costa County (925) 680-8933
KRISTINA CARPENTER D.O.
Family Medicine
2481 PACHECO ST
CONCORD, CA 94520
Contra Costa County (925) 680-8933

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 Fred Vonstieff's NPI number?

The NPI number for Fred Vonstieff is 1790849685. It was assigned to this individual provider in the NPPES registry on December 21, 2006.

Where is Fred Vonstieff located?

Fred Vonstieff practices at 2481 Pacheco St, Concord, CA 94520. The listed phone number is (925) 680-8933.

What is Fred Vonstieff's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Addiction Medicine, with taxonomy code 207QA0401X.

Is Fred Vonstieff enrolled in Medicare?

Yes. Fred Vonstieff 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.

When was this NPI record last updated?

The NPPES record for Fred Vonstieff was last updated on July 30, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.