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Orthopedic Surgery

James G. Distefano Jr., MD

Works at hospitals in Alameda, CA · Oakland, CA · California

Summary

Dr. James G. Distefano Jr., MD is an orthopedic surgeon at 13855 E 14th St, San Leandro, CA 94578. Phone: (510) 357-6500. Accepts Medicare assignment. In 2024, James G. Distefano Jr. had 86 Original Medicare patients and 282 services. NPI 1942513882. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Orthopedic surgeon (Medicare lists Orthopedic Surgery)
  • Address: 13855 E 14th St, San Leandro, CA 94578 · Directions (3 more locations)
  • Phone: (510) 357‑6500
  • Medicare: Accepts Medicare assignment
  • Hospitals: Alameda Hospital, Highland Hospital
  • Group practice: Alameda Health System
  • Medical school: graduated 2006 (20 years since medical school)
  • Gender (as listed): Male

From official Medicare data

This page shows what Medicare's official clinician data says about James G. Distefano Jr., joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does James G. Distefano Jr. accept Medicare assignment?
Yes. Medicare's clinician data says James G. Distefano Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
How many Medicare patients does James G. Distefano Jr. see?
In 2024, CMS data shows 86 Original Medicare patients and 282 services for James G. Distefano Jr.. This counts Original Medicare only and measures volume, not quality.
What is James G. Distefano Jr.'s NPI number?
1942513882. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for James G. Distefano Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients86
Services billed to Medicare282
Different services or procedures33
Participating Medicare providerYes
Average age of these patients71

Most frequent services

  1. Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)96 services
  2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)57 services
  3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)51 services
  4. Aspiration and/or injection of fluid from large joint (20610)27 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High blood pressure75%
  • Arthritis75%
  • High cholesterol74%
  • Diabetes37%
  • Depression30%
  • Anxiety24%

Hospitals where James G. Distefano Jr. works

Medicare's Facility Affiliation Data lists James G. Distefano Jr. at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

  • Alameda HospitalAlameda, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050211
  • Highland HospitalOakland, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050320

Practice locations

Addresses where James G. Distefano Jr. is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists James G. Distefano Jr. as a member of this group (CMS data updated October 2, 2026).

  • Alameda Health System601 clinicians in the group

Specialties

Find other Orthopedic Surgery doctors in California →

Other orthopedic surgeons in San Leandro

Clinicians with the same Medicare primary specialty in San Leandro, CA — not a recommendation.

All orthopedic surgeons in San Leandro →

Other clinicians in Alameda Health System

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Graduation year2006 (20 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1942513882
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. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians