CHRISTIANNA CHORONG SIM MD
NPI 1396235743
Emergency Medicine in Santa Monica, CA

Q: What is Christianna Sim's NPI number?

The NPI number for Christianna Sim is 1396235743. It was assigned to this individual provider in the NPPES registry on May 11, 2018.

Q: What is Christianna Sim's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Christianna Sim was last updated on August 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.

Active since May 11, 2018PECOS Enrolled

1250 16TH ST, SANTA MONICA, CA 90404(310) 794-0585 Get Directions Write a Review

NPPES record last updated: August 29, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 18, 2023, May 11, 2018 (2 updates tracked since 2018).

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About Christianna Chorong Sim Md NPPES

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

CHRISTIANNA CHORONG SIM MD (NPI 1396235743) is an individual emergency medicine provider in Santa Monica, California, licensed in California (A185926) and active in the NPI registry since May 2018. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1396235743

Entity TypeIndividualFemale

Primary Taxonomy207P00000X

Provider Legal NameCHRISTIANNA CHORONG SIMCredential: MD

Location Address1250 16TH STSanta Monica, CA 90404-1249

Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631

Phone(310) 794-0585

Sole ProprietorNo

Enumeration DateMay 11, 2018

Last NPPES UpdateAugust 29, 20252 updates tracked since enumeration

NPPES CertifiedAugust 29, 2025

✔ NPI 1396235743 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 · A185926

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

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Secondary Practice Locations 2

Location 1450 Clarkson AveBrooklyn, NY 11203-2012 · Phone (718) 270-6315

Location 2300 Pasteur DrStanford, CA 94305-2200 · Phone (650) 723-4000

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Christianna Chorong Sim Md 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

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

Regents Of The Univ Of Ca Emer Med

3.5 mi

Emergency Medicine

757 WESTWOOD PLZ, STE 1419
Los Angeles, CA 90095

Reassigned Medicare billing, California enrollment
135 clinicians in this Medicare group

NPI 1104889138 (310) 825-2111

City & County Of San Francisco

336 mi

Federally Qualified Health Center (FQHC)

2403 KEITH STREET
San Francisco, CA 94124

Reassigned Medicare billing, California enrollment
1,573 clinicians in this Medicare group

NPI 1184351082 (628) 217-5500

University Of California Sfgh Medical Group

338 mi

Endocrinology, Diabetes & Metabolism

2540 23RD ST, 2ND FLOOR, ROOM 2110
San Francisco, CA 94143

Reassigned Medicare billing, California enrollment
637 clinicians in this Medicare group

NPI 1265407381 (415) 514-9031

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

Areas of Expertise CMS Part B claims 5

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.

247 services245 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.

39 services39 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.

36 services36 patients

Ultrasound of heart, follow-up 93308

A follow-up ultrasound of the heart, also known as an echocardiogram, is a non-invasive test that uses sound waves to create images of your heart. It helps doctors monitor your heart's function and structures after initial assessment or treatment.

27 services27 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

17 services17 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.

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