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Neurology

James Collen, MD

Sees patients in Upland, CA · California

Summary

James Collen, MD (Neurology) is enrolled with Medicare at 1 practice location in Upland, CA. NPI 1851845945. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(909) 982‑2719 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about James Collen, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
NeurologyPrimary specialty
YesAccepts Medicare assignment
11Years since medical school (graduated 2015)
Ohio State University College Of MedicineMedical school
MaleGender (as listed)
The Neurology Group IncGroup practice

Quick answers

Where does James Collen see patients?
Medicare's clinician data lists 1 practice location in Upland, CA. Call before your visit to confirm the address.
What is James Collen's specialty?
Medicare lists Neurology as the primary specialty.
Does James Collen accept Medicare assignment?
Yes. Medicare's clinician data says James Collen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for James Collen?
(909) 982-2719, as listed in official Medicare / NPI Registry data.
What is James Collen's NPI number?
1851845945. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where James Collen is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists James Collen as a member of this group (CMS data updated 2026-10-02).

  • The Neurology Group Inc19 clinicians in the group

Specialties

Find other Neurology doctors in California →

Other neurologists in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

All neurologists in California →

Clinician information

CredentialMD
Medical schoolOhio State University College Of Medicine
Graduation year2015
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1851845945
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians