Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Medical Oncology

Uladzislau Naidzionak, MD

Works at hospitals in Chula Vista, CA · San Diego, CA · California

Summary

Dr. Uladzislau Naidzionak, MD is an oncologist at 7901 Frost St, San Diego, CA 92123. Phone: (858) 939-3400. Accepts Medicare assignment. In 2024, Uladzislau Naidzionak had 170 Original Medicare patients and 71,182 services. NPI 1023246212. 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.

From official Medicare data

This page shows what Medicare's official clinician data says about Uladzislau Naidzionak, 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 Uladzislau Naidzionak accept Medicare assignment?
Yes. Medicare's clinician data says Uladzislau Naidzionak 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 Uladzislau Naidzionak see?
In 2024, CMS data shows 170 Original Medicare patients and 71,182 services for Uladzislau Naidzionak. This counts Original Medicare only and measures volume, not quality.
What is Uladzislau Naidzionak's NPI number?
1023246212. 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 Uladzislau Naidzionak, 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 patients170
Services billed to Medicare71,182
Different services or procedures77
Participating Medicare providerYes
Average age of these patients72

Most frequent services

  1. Injection, denosumab, 1 mg (J0897)7,201 services
  2. Injection, epoetin alfa-epbx, biosimilar, (retacrit) (for non-esrd use), 1000 units (Q5106)5,460 services
  3. Injection, epoetin alfa, (for non-esrd use), 1000 units (J0885)2,940 services
  4. Injection, granisetron hydrochloride, 100 mcg (J1626)1,150 services
  5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)840 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%
  • Chronic kidney disease75%
  • High cholesterol63%
  • Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)49%
  • Diabetes46%
  • Arthritis40%

Hospitals where Uladzislau Naidzionak works

Medicare's Facility Affiliation Data lists Uladzislau Naidzionak 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 Uladzislau Naidzionak is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Uladzislau Naidzionak as a member of these groups (CMS data updated October 2, 2026).

  • Emergency and Acute Care Medical Corporation422 clinicians in the group
  • San Diego Oncology Medical Clinic2 clinicians in the group

Specialties

Find other Medical Oncology doctors in California →

Other oncologists in San Diego

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

All oncologists in San Diego →

Other clinicians in Emergency and Acute Care Medical Corporation

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)1023246212
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