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General Surgery

James D. Maciel, MD

Sees patients in Newhall, CA · Riverside, CA · California

Summary

James D. Maciel, MD (General Surgery) is enrolled with Medicare at 2 practice locations in Newhall, CA and Riverside, CA. NPI 1225412521. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(714) 458‑4617 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about James D. Maciel, 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

2Practice locations
General SurgeryPrimary specialty
YesAccepts Medicare assignment
11Years since medical school (graduated 2015)
University Of California, Geffen School Of MedicineMedical school
MaleGender (as listed)

Quick answers

Where does James D. Maciel see patients?
Medicare's clinician data lists 2 practice locations, including Newhall, CA and Riverside, CA. Call before your visit to confirm the address.
What is James D. Maciel's specialty?
Medicare lists General Surgery as the primary specialty.
Does James D. Maciel accept Medicare assignment?
Yes. Medicare's clinician data says James D. Maciel 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 D. Maciel?
(714) 458-4617, as listed in official Medicare / NPI Registry data.
What is James D. Maciel's NPI number?
1225412521. 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 D. Maciel is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other General Surgery doctors in California →

Other general surgeons in California

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

All general surgeons in California →

Clinician information

CredentialMD
Medical schoolUniversity Of California, Geffen School Of Medicine
Graduation year2015
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1225412521
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