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Diagnostic Radiology

Alexander W. Keedy, MD

Works at hospitals in Santa Clara, CA · California

Summary

Dr. Alexander W. Keedy, MD is a radiologist at 4501 Sand Creek Rd, Antioch, CA 94531. Phone: (925) 813-6500. Accepts Medicare assignment. In 2024, Alexander W. Keedy had 125 Original Medicare patients and 204 services. NPI 1265767842. 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: Radiologist (Medicare lists Diagnostic Radiology)
  • Address: 4501 Sand Creek Rd, Antioch, CA 94531 · Directions (3 more locations)
  • Phone: (925) 813‑6500
  • Medicare: Accepts Medicare assignment
  • Hospital: Kaiser Foundation Hospital-Santa Clara
  • Group practice: Permanente Medical Group Inc
  • Medical school: University Of California, Irvine, California College Of Medicine · graduated 2008 (18 years since medical school)
  • Gender (as listed): Male

From official Medicare data

This page shows what Medicare's official clinician data says about Alexander W. Keedy, 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 Alexander W. Keedy accept Medicare assignment?
Yes. Medicare's clinician data says Alexander W. Keedy 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 Alexander W. Keedy see?
In 2024, CMS data shows 125 Original Medicare patients and 204 services for Alexander W. Keedy. This counts Original Medicare only and measures volume, not quality.
What is Alexander W. Keedy's NPI number?
1265767842. 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 Alexander W. Keedy, 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 patients125
Services billed to Medicare204
Different services or procedures43
Participating Medicare providerYes
Average age of these patients70

Most frequent services

  1. X-ray of chest, 1 view (71045)34 services
  2. Screening mammography (77067)27 services
  3. Ct scan head or brain without contrast (70450)20 services
  4. X-ray of chest, 2 views (71046)17 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%
  • High cholesterol66%
  • Arthritis51%
  • Diabetes47%
  • Chronic kidney disease35%
  • Ischemic heart disease30%

Hospitals where Alexander W. Keedy works

Medicare's Facility Affiliation Data lists Alexander W. Keedy 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.

Practice locations

Addresses where Alexander W. Keedy is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Alexander W. Keedy as a member of this group (CMS data updated October 2, 2026).

  • Permanente Medical Group Inc10,996 clinicians in the group

Specialties

Find other Diagnostic Radiology doctors in California →

Other radiologists in California

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

All radiologists in California →

Other clinicians in Permanente Medical Group Inc

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

Clinician information

CredentialMD
Medical schoolUniversity Of California, Irvine, California College Of Medicine
Graduation year2008 (18 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1265767842
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