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DR. JOHN CHRISTIAN ONEIL M.D.
NPI 1952573826
General Practice in Calistoga, CA

Active since March 31, 2008PECOS Enrolled
3076 MYRTLEDALE RD, CALISTOGA, CA 94515(707) 942-6888 Get Directions Write a Review

NPPES record last updated: July 2, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Feb 10, 2021, Mar 17, 2018, Sep 15, 2017 (3 updates tracked since 2017).

About Dr. John Christian Oneil M.d. NPPES

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

DR. JOHN CHRISTIAN ONEIL M.D. (NPI 1952573826) is an individual general practice provider in Calistoga, California, licensed in California (A118663) and active in the NPI registry since March 2008. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1952573826
Entity TypeIndividualMale
Primary Taxonomy208D00000X
Provider Legal NameDR. JOHN CHRISTIAN ONEILCredential: M.D.
Location Address3076 MYRTLEDALE RDCalistoga, CA 94515-1052
Mailing AddressPo Box 1793Middletown, CA 95461-1793 · (505) 506-4044
Phone(707) 942-6888
Sole ProprietorYes
Enumeration DateMarch 31, 2008
Last NPPES UpdateJuly 2, 20263 updates tracked since enumeration
NPPES CertifiedJuly 2, 2026
✔ NPI 1952573826 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyGeneral PracticeAllopathic & Osteopathic Physicians
Taxonomy Code208D00000X
License✔ Licensed in CA · A118663
Definition
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. Source: National Uniform Claim Committee
3076 MYRTLEDALE RD, Calistoga, CA 94515
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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. John Christian Oneil M.d. 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.

Other Providers at the Same Location NPPES 5

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

SIAVASH ROSTAMI JAFARABAD
Nurse Practitioner (Psychiatric/Mental Health)
3076 MYRTLEDALE RD
CALISTOGA, CA 94515
Napa County (707) 403-8529
DUFFY'S MYRTLEDALE, INC.
Substance Abuse Rehabilitation Facility
3076 MYRTLEDALE RD
CALISTOGA, CA 94515
Napa County (707) 942-6888
BRITTANY MARTE PA-C
Physician Assistant
3076 MYRTLEDALE RD
CALISTOGA, CA 94515
Napa County (707) 942-6888
DEBORAH ANN BLACK
Counselor (Addiction (Substance Use Disorder))
3076 MYRTLEDALE RD
CALISTOGA, CA 94515
Napa County (707) 403-8529
DUFFY'S NAPA VALLEY REHAB, LLC
Substance Abuse Rehabilitation Facility
3076 MYRTLEDALE RD
CALISTOGA, CA 94515
Napa County (707) 942-6888

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 John Oneil's NPI number?

The NPI number for John Oneil is 1952573826. It was assigned to this individual provider in the NPPES registry on March 31, 2008.

Where is John Oneil located?

John Oneil practices at 3076 Myrtledale Rd, Calistoga, CA 94515. The listed phone number is (707) 942-6888.

What is John Oneil's specialty?

The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.

Is John Oneil enrolled in Medicare?

Yes. John Oneil is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for John Oneil was last updated on July 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.