NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1396137337 DO
Verify on CMS → Heesun Choi, DO
Emergency Medicine Physician in Orange, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 64,463 in Emergency Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
47
Medicare Part D claims · 39 beneficiaries · Emergency Medicine Physician avg: 352
MIPS score
87/100
▲ 3 pts above national avg 83.5 · Above neutral
What the federal data shows
Heesun Choi, DO reported a CMS MIPS final score of 87/100 - above the 83.5 national average - and filed 47 Medicare Part D claims in 2023.
- 87/100
- MIPS score · +3 vs avg
- 47
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥49th
- pct among measured MIPS (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Heesun Choi, DO
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1396137337), first enumerated 02/27/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 47 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 87/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Heesun Choi, DO's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1396137337 · Emergency Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-ABOVE · RX-TRACE · BOOK-MID · PHOTO-FINISH
- NPI-10 1396137337
- ENUM-MID 2015
- TAX-MEGA 64K Emergency Medicine
- MIPS-ABOVE 87/100
- RX-TRACE 47
- BOOK-MID 6,965 in California
- PHOTO-FINISH Randall Beaupre · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Choi · this prov…
Choi · this provider
87 MIPS pts
- Morgan Maxon · h…
Morgan Maxon
87 MIPS pts
- Randall Beaupre …
Randall Beaupre
87 MIPS pts
- Natalie Greco · …
Natalie Greco
87 MIPS pts
- Brian Jahnny · n…
Brian Jahnny
87 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Heesun Choi, DO's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
87 ≥ 49th percentile 49% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Heesun Choi, DO sits
This provider among emergency medicine physician peers
Across the 14,017 emergency medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Heesun Choi, DO writes more Part D claims than 16% of them and scores higher on MIPS quality than 39% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one emergency medicine physician peer from a representative sample of 60; the gold marker is Heesun Choi, DO. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Heesun Choi, DO practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Heesun Choi, DO?
High performer (top quartile)Primary specialty
Emergency Medicine Physician
Medicare Part D claims
47 87% vs specialty avg
MIPS final score
87/100 3.5 pts vs avg
Specialty distribution in California
How Emergency Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Heesun Choi, DO's 2023 MIPS final score plotted against the Emergency Medicine Physician national average
- MIPS Final Score
- 87/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1396137337 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 02/27/2015 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
86.9932
Final Score
Measured-score avg: 83.5
79.3582
Quality
53.9524
Cost
88
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Heesun Choi, DO bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Tempe Emergency Physicians Ltd
Bullhead City, AZ
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Heesun Choi, DO. To verify Heesun Choi, DO's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
47
Total Claims
$519
Total Drug Cost
39
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 48
- Total Day Supply
- 514
- Generic Drug Cost
- $483
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 68.4 years
- Avg HCC Risk Score
- 2.01
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 11, 65-74: 19, 75-84: N/A, 85+: N/A
Emergency Medicine Physician Overview
How Heesun Choi, DO fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Heesun Choi, DO's 47 claims are below the specialty average of 352.
Nationwide Emergency Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Choi, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (87 here).
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Emergency Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Choi.
One of 6,965 Emergency Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Cooper Aakhus
MD
Stanford, CA
Dr. Pyra Aarden
MD
Martinez, CA
Dr. Neal Aaron
D.O.
Encinitas, CA
Eric Aaserude
Walnut Creek, CA
Dr. Nader Abas
MD
Barstow, CA
Compare Emergency Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Heesun Choi, DO's specialty? ▼
Heesun Choi, DO specializes in Emergency Medicine Physician and practices in Orange, California. Credentials: DO.
How much does Heesun Choi, DO prescribe under Medicare Part D? ▼
In 2023, Heesun Choi, DO wrote 47 Medicare Part D claims totaling $519 in drug costs for 39 beneficiaries.
What is Heesun Choi, DO's Medicare quality score? ▼
Heesun Choi, DO has a CMS MIPS Final Score of 87/100 (Quality: 79.4, Cost: 54). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Heesun Choi, DO located? ▼
Heesun Choi, DO is located at 101 THE CITY DR S, Orange, CA, 92868. Phone: (714) 880-7812.
What is Heesun Choi, DO's NPI number? ▼
Heesun Choi, DO's National Provider Identifier (NPI) is 1396137337, issued on 02/27/2015.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
Does Heesun Choi, DO accept Medicare? ▼
Heesun Choi, DO appears in CMS Medicare data with 47 Part D claims and 39 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Heesun Choi, DO's credentials? ▼
Heesun Choi, DO's NPI is 1396137337 with credentials DO. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.