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DR. ATSUKO KOYAMA M.D., M.P.H
NPI 1730387564
Emergency Medicine in Phoenix, AZ

Active since July 03, 2007PECOS Enrolled
4141 N 32ND ST STE 105, PHOENIX, AZ 85018(602) 279-2337 Get Directions Write a Review

NPPES record last updated: August 29, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 29, 2023, Aug 21, 2023, Nov 4, 2019 (3 updates tracked since 2019).

About Dr. Atsuko Koyama M.d., M.p.h NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ATSUKO KOYAMA M.D., M.P.H (NPI 1730387564) is an individual emergency medicine provider in Phoenix, Arizona, licensed in Arizona (59533) and active in the NPI registry since July 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1730387564
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameDR. ATSUKO KOYAMACredential: M.D., M.P.H
Location Address4141 N 32ND ST STE 105Phoenix, AZ 85018-4775
Mailing Address4141 N 32nd St Ste 105Phoenix, AZ 85018-4775
Phone(602) 279-2337
Sole ProprietorNo
Enumeration DateJuly 3, 2007
Last NPPES UpdateAugust 29, 20233 updates tracked since enumeration
NPPES CertifiedAugust 29, 2023
✔ NPI 1730387564 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in AZ · 59533
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedPediatrics · Pediatric Emergency MedicineTaxonomy 2080P0204X · License 59533 (AZ)
4141 N 32ND ST STE 105, Phoenix, AZ 85018
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Atsuko Koyama M.d., M.p.h is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Atsuko Koyama reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Phoenix Children's Hospital
2.1 mi
Pediatrics
1919 E THOMAS RD
Phoenix, AZ 85016
  • Reassigned Medicare billing, Arizona enrollment
  • 1,416 clinicians in this Medicare group
NPI 1922112044 (602) 933-1000
District Medical Group, Inc
2.8 mi
Surgery
2525 E ROOSEVELT ST, MED CLINIC - INFECTIOUS DISEASE
Phoenix, AZ 85008
  • Reassigned Medicare billing, Arizona enrollment
  • 1,490 clinicians in this Medicare group
NPI 1174856280 (602) 344-1095
Cep America - Arizona PC
11 mi
Emergency Medicine
1400 S DOBSON RD
Mesa, AZ 85202
  • Reassigned Medicare billing, Arizona enrollment
  • 174 clinicians in this Medicare group
NPI 1356021190 (480) 412-3000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85018 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$85.89 typical visit price
range $55.44 – $168.60
Typical copayment $21.47 (range $13.86 – $42.15)
Most-billed visit code 99203
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. MARIANNE CONTRERAS PA
Physician Assistant (Medical)
4141 N 32ND ST STE 105
PHOENIX, AZ 85018
Maricopa County (602) 279-2337

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Atsuko Koyama's NPI number?

The NPI number for Atsuko Koyama is 1730387564. It was assigned to this individual provider in the NPPES registry on July 3, 2007.

Where is Atsuko Koyama located?

Atsuko Koyama practices at 4141 N 32nd St Ste 105, Phoenix, AZ 85018. The listed phone number is (602) 279-2337.

What is Atsuko Koyama's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Atsuko Koyama enrolled in Medicare?

Yes. Atsuko Koyama is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Atsuko Koyama's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Atsuko Koyama reassigns Medicare benefits to 3 organizations: Phoenix Children's Hospital (Phoenix, AZ), District Medical Group, Inc (Phoenix, AZ) and Cep America - Arizona PC (Mesa, AZ). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Atsuko Koyama's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Atsuko Koyama was last updated on August 29, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.