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MS. ROSEMARIE BUSTOS DIAZ
NPI 1215317441
Emergency Medicine in Santa Monica, CA

Active since June 03, 2015PECOS Enrolled
100/100
CMS Quality Rating
1250 16TH ST, SANTA MONICA, CA 90404(310) 794-7700 Get Directions Write a Review

NPPES record last updated: April 12, 2023. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Ms. Rosemarie Bustos Diaz NPPES

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

MS. ROSEMARIE BUSTOS DIAZ (NPI 1215317441) is an individual emergency medicine provider in Santa Monica, California, licensed in California (A171845) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS and maintains a secondary practice location in Los Angeles.

NPPES Registry Identity

NPI1215317441
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameMS. ROSEMARIE BUSTOS DIAZ
Location Address1250 16TH STSanta Monica, CA 90404-1249
Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631
Phone(310) 794-7700
Sole ProprietorNo
Enumeration DateJune 3, 2015
Last NPPES UpdateApril 12, 2023
NPPES CertifiedApril 12, 2023
✔ NPI 1215317441 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A171845
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.
1250 16TH ST, Santa Monica, CA 90404
Open in Google Maps ↗

Secondary Practice Location 1

Location 1757 Westwood Plz Ste 1517Los Angeles, CA 90095-5000 · Phone (310) 825-9111

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ms. Rosemarie Bustos Diaz 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.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
128 services126 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
122 services120 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
42 services42 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
28 services27 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90404 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality95.72
Promoting Interoperability100
Improvement Activities40
Cost81.58

Other Providers at the Same Location NPPES 20

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

ISABELLA JUSAY NP
Nurse Practitioner
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (424) 259-9450
CHRISTINE PHAM PHARMD
Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (414) 259-8500
WILLIAM SHYY M.D.
Emergency Medicine
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 794-7700
MAUREEN SALIGUMBA ACNP
Nurse Practitioner (Acute Care)
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 319-4000
BREANNE CAROLYN GRAZER NP
Nurse Practitioner
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 319-4000
KYLE TRAN
Pharmacist
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (310) 825-9111
ERMINA CAVCIC
Nurse Practitioner (Family)
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (424) 259-8262
RACHAEL BOLLINGER
Nurse Practitioner (Acute Care)
1250 16TH ST
SANTA MONICA, CA 90404
Los Angeles County (424) 259-9457

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 Rosemarie Diaz's NPI number?

The NPI number for Rosemarie Diaz is 1215317441. It was assigned to this individual provider in the NPPES registry on June 3, 2015.

Where is Rosemarie Diaz located?

Rosemarie Diaz practices at 1250 16th St, Santa Monica, CA 90404. The listed phone number is (310) 794-7700.

What is Rosemarie Diaz's specialty?

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

Is Rosemarie Diaz enrolled in Medicare?

Yes. Rosemarie Diaz is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Rosemarie Diaz was last updated on April 12, 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.