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DR. JAMES STEPHEN ALLEN D.O.
NPI 1902099518
Internal Medicine in San Ramon, CA

Active since August 27, 2007PECOS EnrolledAccepts Medicare Assignment
6001 BOLLINGER CANYON RD, CHEVRON SINGAPORE-ORCHARD, SAN RAMON, CA 94583(925) 842-3224(925) 842-3242 Get Directions Write a Review

NPPES record last updated: March 17, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. James Stephen Allen D.o. NPPES

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

DR. JAMES STEPHEN ALLEN D.O. (NPI 1902099518) is an individual internal medicine provider in San Ramon, California, licensed in New York (159380-1) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS, is affiliated with Grays Harbor Community Hospital, and maintains a secondary practice location in Aberdeen.

NPPES Registry Identity

NPI1902099518
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. JAMES STEPHEN ALLENCredential: D.O.
Location Address6001 BOLLINGER CANYON RD, CHEVRON SINGAPORE-ORCHARDSan Ramon, CA 94583-7170
Mailing Address6001 Bollinger Canyon RdSan Ramon, CA 94583-2324 · (925) 842-3224 · Fax (925) 842-3242
Phone(925) 842-3224
Fax(925) 842-3242
Sole ProprietorNo
Medical School CMSOtherGraduated 1983
Enumeration DateAugust 27, 2007
Last NPPES UpdateMarch 17, 2026
NPPES CertifiedMarch 17, 2026
✔ NPI 1902099518 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in NY · 159380-1✔ Licensed in WA · OP61072641
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.
6001 BOLLINGER CANYON RD, San Ramon, CA 94583
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Secondary Practice Location 1

Location 11813 Sumner AveAberdeen, WA 98520-4600 · Phone (360) 538-1293 · Fax (360) 538-3908

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. James Stephen Allen D.o. 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 ID7315422110
PECOS Enrollment IDI20260330003568
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.

Medicare Billing Reassignment

Medicare enrollment records show James Allen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sea Mar Community Health Centers
542 mi
Federally Qualified Health Center (FQHC)
19005 SE 34TH ST BLDG 3
Vancouver, WA 98683
  • Reassigned Medicare billing, Washington enrollment
  • 525 clinicians in this Medicare group
NPI 1770933640 (360) 726-6720

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Grays Harbor Community Hospital

Acute Care Hospitals · Aberdeen, WA
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500031
Location915 Anderson DriveAberdeen, WA 98520 · Grays Harbor County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94583 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

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

STEPHEN FRANGOS MD
Preventive Medicine (Preventive Medicine/Occupational Environmental Medicine)
6001 BOLLINGER CANYON RD
SAN RAMON, CA 94583
Contra Costa County (925) 842-2995

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 Allen's NPI number?

The NPI number for James Allen is 1902099518. It was assigned to this individual provider in the NPPES registry on August 27, 2007.

Where is James Allen located?

James Allen practices at 6001 Bollinger Canyon Rd Chevron Singapore-Orchard, San Ramon, CA 94583. The listed phone number is (925) 842-3224.

What is James Allen's specialty?

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

Is James Allen enrolled in Medicare?

Yes. James Allen 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.

Which organization bills Medicare for James Allen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Allen reassigns Medicare benefits to Sea Mar Community Health Centers (Vancouver, WA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Allen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does James Allen accept?

Health plans from Ambetter Health and Providence Health Plan list James Allen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is James Allen affiliated with any hospitals?

According to CMS data, James Allen is affiliated with Grays Harbor Community Hospital.

When was this NPI record last updated?

The NPPES record for James Allen was last updated on March 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.