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

Emergency Medicine

Sow A. Kobayashi, MD

Works at hospitals in Chula Vista, CA · California

Summary

Dr. Sow A. Kobayashi, MD is an emergency medicine doctor at 1250 E Almond Ave, Madera, CA 93637. Phone: (559) 675-5501. Accepts Medicare assignment. In 2024, Sow A. Kobayashi had 418 Original Medicare patients and 827 services. NPI 1205194578. 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: Emergency medicine doctor (Medicare lists Emergency Medicine)
  • Address: 1250 E Almond Ave, Madera, CA 93637 · Directions (2 more locations)
  • Phone: (559) 675‑5501
  • Medicare: Accepts Medicare assignment
  • Hospital: Sharp Chula Vista Medical Center
  • Group practice: Cep America - California
  • Medical school: University Of California, San Francisco School Of Medicine · graduated 2011 (15 years since medical school)
  • Gender (as listed): Male

From official Medicare data

This page shows what Medicare's official clinician data says about Sow A. Kobayashi, 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 Sow A. Kobayashi accept Medicare assignment?
Yes. Medicare's clinician data says Sow A. Kobayashi 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 Sow A. Kobayashi see?
In 2024, CMS data shows 418 Original Medicare patients and 827 services for Sow A. Kobayashi. This counts Original Medicare only and measures volume, not quality.
What is Sow A. Kobayashi's NPI number?
1205194578. 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 Sow A. Kobayashi, 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 patients418
Services billed to Medicare827
Different services or procedures18
Participating Medicare providerYes
Average age of these patients75

Most frequent services

  1. Emergency department visit with high level of medical decision making (99285)368 services
  2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)278 services
  3. Advance care planning, first 30 minutes (99497)88 services
  4. Emergency department visit with moderate level of medical decision making (99284)36 services
  5. Critical care, first 30-74 minutes (99291)31 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 cholesterol75%
  • Diabetes57%
  • Arthritis47%
  • Chronic kidney disease46%
  • Ischemic heart disease40%

Hospitals where Sow A. Kobayashi works

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

Group practices

Medicare enrollment lists Sow A. Kobayashi as a member of this group (CMS data updated October 2, 2026).

  • Cep America - California1,292 clinicians in the group

Specialties

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Madera

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

All emergency medicine doctors in Madera →

Other clinicians in Cep America - California

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

Clinician information

CredentialMD
Medical schoolUniversity Of California, San Francisco School Of Medicine
Graduation year2011 (15 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1205194578
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